Superficial injury of thorax (S20) ICD-10-CM
The S20 code range covers superficial injury of thorax with 422 ICD-10-CM diagnosis codes. 294 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category S20
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the S20 Range 422 codes · 294 billable
- S20 Superficial injury of thoraxNon-billable
- S20.0 Contusion of breastNon-billable
- S20.00 Contusion of breast, unspecified breastNon-billable
- S20.00XA Contusion of breast, unspecified breast, initial encounter
- S20.00XD Contusion of breast, unspecified breast, subsequent encounter
- S20.00XS Contusion of breast, unspecified breast, sequela
- S20.01 Contusion of right breastNon-billable
- S20.01XA Contusion of right breast, initial encounter
- S20.01XD Contusion of right breast, subsequent encounter
- S20.01XS Contusion of right breast, sequela
- S20.02 Contusion of left breastNon-billable
- S20.02XA Contusion of left breast, initial encounter
- S20.02XD Contusion of left breast, subsequent encounter
- S20.02XS Contusion of left breast, sequela
- S20.1 Other and unspecified superficial injuries of breastNon-billable
- S20.10 Unspecified superficial injuries of breastNon-billable
- S20.101 Unspecified superficial injuries of breast, right breastNon-billable
- S20.101A Unspecified superficial injuries of breast, right breast, initial encounter
- S20.101D Unspecified superficial injuries of breast, right breast, subsequent encounter
- S20.101S Unspecified superficial injuries of breast, right breast, sequela
- S20.102 Unspecified superficial injuries of breast, left breastNon-billable
- S20.102A Unspecified superficial injuries of breast, left breast, initial encounter
- S20.102D Unspecified superficial injuries of breast, left breast, subsequent encounter
- S20.102S Unspecified superficial injuries of breast, left breast, sequela
- S20.109 Unspecified superficial injuries of breast, unspecified breastNon-billable
- S20.109A Unspecified superficial injuries of breast, unspecified breast, initial encounter
- S20.109D Unspecified superficial injuries of breast, unspecified breast, subsequent encounter
- S20.109S Unspecified superficial injuries of breast, unspecified breast, sequela
- S20.11 Abrasion of breastNon-billable
- S20.111 Abrasion of breast, right breastNon-billable
- S20.111A Abrasion of breast, right breast, initial encounter
- S20.111D Abrasion of breast, right breast, subsequent encounter
- S20.111S Abrasion of breast, right breast, sequela
- S20.112 Abrasion of breast, left breastNon-billable
- S20.112A Abrasion of breast, left breast, initial encounter
- S20.112D Abrasion of breast, left breast, subsequent encounter
- S20.112S Abrasion of breast, left breast, sequela
- S20.119 Abrasion of breast, unspecified breastNon-billable
- S20.119A Abrasion of breast, unspecified breast, initial encounter
- S20.119D Abrasion of breast, unspecified breast, subsequent encounter
- S20.119S Abrasion of breast, unspecified breast, sequela
- S20.12 Blister (nonthermal) of breastNon-billable
- S20.121 Blister (nonthermal) of breast, right breastNon-billable
- S20.121A Blister (nonthermal) of breast, right breast, initial encounter
- S20.121D Blister (nonthermal) of breast, right breast, subsequent encounter
- S20.121S Blister (nonthermal) of breast, right breast, sequela
- S20.122 Blister (nonthermal) of breast, left breastNon-billable
- S20.122A Blister (nonthermal) of breast, left breast, initial encounter
- S20.122D Blister (nonthermal) of breast, left breast, subsequent encounter
- S20.122S Blister (nonthermal) of breast, left breast, sequela
- S20.129 Blister (nonthermal) of breast, unspecified breastNon-billable
- S20.129A Blister (nonthermal) of breast, unspecified breast, initial encounter
- S20.129D Blister (nonthermal) of breast, unspecified breast, subsequent encounter
- S20.129S Blister (nonthermal) of breast, unspecified breast, sequela
- S20.14 External constriction of part of breastNon-billable
- S20.141 External constriction of part of breast, right breastNon-billable
- S20.141A External constriction of part of breast, right breast, initial encounter
- S20.141D External constriction of part of breast, right breast, subsequent encounter
- S20.141S External constriction of part of breast, right breast, sequela
- S20.142 External constriction of part of breast, left breastNon-billable
- S20.142A External constriction of part of breast, left breast, initial encounter
- S20.142D External constriction of part of breast, left breast, subsequent encounter
- S20.142S External constriction of part of breast, left breast, sequela
- S20.149 External constriction of part of breast, unspecified breastNon-billable
- S20.149A External constriction of part of breast, unspecified breast, initial encounter
- S20.149D External constriction of part of breast, unspecified breast, subsequent encounter
- S20.149S External constriction of part of breast, unspecified breast, sequela
- S20.15 Superficial foreign body of breastNon-billable
- S20.151 Superficial foreign body of breast, right breastNon-billable
- S20.151A Superficial foreign body of breast, right breast, initial encounter
- S20.151D Superficial foreign body of breast, right breast, subsequent encounter
- S20.151S Superficial foreign body of breast, right breast, sequela
- S20.152 Superficial foreign body of breast, left breastNon-billable
- S20.152A Superficial foreign body of breast, left breast, initial encounter
- S20.152D Superficial foreign body of breast, left breast, subsequent encounter
- S20.152S Superficial foreign body of breast, left breast, sequela
- S20.159 Superficial foreign body of breast, unspecified breastNon-billable
- S20.159A Superficial foreign body of breast, unspecified breast, initial encounter
- S20.159D Superficial foreign body of breast, unspecified breast, subsequent encounter
- S20.159S Superficial foreign body of breast, unspecified breast, sequela
- S20.16 Insect bite (nonvenomous) of breastNon-billable
- S20.161 Insect bite (nonvenomous) of breast, right breastNon-billable
- S20.161A Insect bite (nonvenomous) of breast, right breast, initial encounter
- S20.161D Insect bite (nonvenomous) of breast, right breast, subsequent encounter
- S20.161S Insect bite (nonvenomous) of breast, right breast, sequela
- S20.162 Insect bite (nonvenomous) of breast, left breastNon-billable
- S20.162A Insect bite (nonvenomous) of breast, left breast, initial encounter
- S20.162D Insect bite (nonvenomous) of breast, left breast, subsequent encounter
- S20.162S Insect bite (nonvenomous) of breast, left breast, sequela
- S20.169 Insect bite (nonvenomous) of breast, unspecified breastNon-billable
- S20.169A Insect bite (nonvenomous) of breast, unspecified breast, initial encounter
- S20.169D Insect bite (nonvenomous) of breast, unspecified breast, subsequent encounter
- S20.169S Insect bite (nonvenomous) of breast, unspecified breast, sequela
- S20.17 Other superficial bite of breastNon-billable
- S20.171 Other superficial bite of breast, right breastNon-billable
- S20.171A Other superficial bite of breast, right breast, initial encounter
- S20.171D Other superficial bite of breast, right breast, subsequent encounter
- S20.171S Other superficial bite of breast, right breast, sequela
- S20.172 Other superficial bite of breast, left breastNon-billable
- S20.172A Other superficial bite of breast, left breast, initial encounter
- S20.172D Other superficial bite of breast, left breast, subsequent encounter
- S20.172S Other superficial bite of breast, left breast, sequela
- S20.179 Other superficial bite of breast, unspecified breastNon-billable
- S20.179A Other superficial bite of breast, unspecified breast, initial encounter
- S20.179D Other superficial bite of breast, unspecified breast, subsequent encounter
- S20.179S Other superficial bite of breast, unspecified breast, sequela
- S20.2 Contusion of thoraxNon-billable
- S20.20 Contusion of thorax, unspecifiedNon-billable
- S20.20XA Contusion of thorax, unspecified, initial encounter
- S20.20XD Contusion of thorax, unspecified, subsequent encounter
- S20.20XS Contusion of thorax, unspecified, sequela
- S20.21 Contusion of front wall of thoraxNon-billable
- S20.211 Contusion of right front wall of thoraxNon-billable
- S20.211A Contusion of right front wall of thorax, initial encounter
- S20.211D Contusion of right front wall of thorax, subsequent encounter
- S20.211S Contusion of right front wall of thorax, sequela
- S20.212 Contusion of left front wall of thoraxNon-billable
- S20.212A Contusion of left front wall of thorax, initial encounter
- S20.212D Contusion of left front wall of thorax, subsequent encounter
- S20.212S Contusion of left front wall of thorax, sequela
- S20.213 Contusion of bilateral front wall of thoraxNon-billable
- S20.213A Contusion of bilateral front wall of thorax, initial encounter
- S20.213D Contusion of bilateral front wall of thorax, subsequent encounter
- S20.213S Contusion of bilateral front wall of thorax, sequela
- S20.214 Contusion of middle front wall of thoraxNon-billable
- S20.214A Contusion of middle front wall of thorax, initial encounter
- S20.214D Contusion of middle front wall of thorax, subsequent encounter
- S20.214S Contusion of middle front wall of thorax, sequela
- S20.219 Contusion of unspecified front wall of thoraxNon-billable
- S20.219A Contusion of unspecified front wall of thorax, initial encounter
- S20.219D Contusion of unspecified front wall of thorax, subsequent encounter
- S20.219S Contusion of unspecified front wall of thorax, sequela
- S20.22 Contusion of back wall of thoraxNon-billable
- S20.221 Contusion of right back wall of thoraxNon-billable
- S20.221A Contusion of right back wall of thorax, initial encounter
- S20.221D Contusion of right back wall of thorax, subsequent encounter
- S20.221S Contusion of right back wall of thorax, sequela
- S20.222 Contusion of left back wall of thoraxNon-billable
- S20.222A Contusion of left back wall of thorax, initial encounter
- S20.222D Contusion of left back wall of thorax, subsequent encounter
- S20.222S Contusion of left back wall of thorax, sequela
- S20.223 Contusion of bilateral back wall of thoraxNon-billable
- S20.223A Contusion of bilateral back wall of thorax, initial encounter
- S20.223D Contusion of bilateral back wall of thorax, subsequent encounter
- S20.223S Contusion of bilateral back wall of thorax, sequela
- S20.224 Contusion of middle back wall of thoraxNon-billable
- S20.224A Contusion of middle back wall of thorax, initial encounter
- S20.224D Contusion of middle back wall of thorax, subsequent encounter
- S20.224S Contusion of middle back wall of thorax, sequela
- S20.229 Contusion of unspecified back wall of thoraxNon-billable
- S20.229A Contusion of unspecified back wall of thorax, initial encounter
- S20.229D Contusion of unspecified back wall of thorax, subsequent encounter
- S20.229S Contusion of unspecified back wall of thorax, sequela
- S20.3 Other and unspecified superficial injuries of front wall of thoraxNon-billable
- S20.30 Unspecified superficial injuries of front wall of thoraxNon-billable
- S20.301 Unspecified superficial injuries of right front wall of thoraxNon-billable
- S20.301A Unspecified superficial injuries of right front wall of thorax, initial encounter
- S20.301D Unspecified superficial injuries of right front wall of thorax, subsequent encounter
- S20.301S Unspecified superficial injuries of right front wall of thorax, sequela
- S20.302 Unspecified superficial injuries of left front wall of thoraxNon-billable
- S20.302A Unspecified superficial injuries of left front wall of thorax, initial encounter
- S20.302D Unspecified superficial injuries of left front wall of thorax, subsequent encounter
- S20.302S Unspecified superficial injuries of left front wall of thorax, sequela
- S20.303 Unspecified superficial injuries of bilateral front wall of thoraxNon-billable
- S20.303A Unspecified superficial injuries of bilateral front wall of thorax, initial encounter
- S20.303D Unspecified superficial injuries of bilateral front wall of thorax, subsequent encounter
- S20.303S Unspecified superficial injuries of bilateral front wall of thorax, sequela
- S20.304 Unspecified superficial injuries of middle front wall of thoraxNon-billable
- S20.304A Unspecified superficial injuries of middle front wall of thorax, initial encounter
- S20.304D Unspecified superficial injuries of middle front wall of thorax, subsequent encounter
- S20.304S Unspecified superficial injuries of middle front wall of thorax, sequela
- S20.309 Unspecified superficial injuries of unspecified front wall of thoraxNon-billable
- S20.309A Unspecified superficial injuries of unspecified front wall of thorax, initial encounter
- S20.309D Unspecified superficial injuries of unspecified front wall of thorax, subsequent encounter
- S20.309S Unspecified superficial injuries of unspecified front wall of thorax, sequela
- S20.31 Abrasion of front wall of thoraxNon-billable
- S20.311 Abrasion of right front wall of thoraxNon-billable
- S20.311A Abrasion of right front wall of thorax, initial encounter
- S20.311D Abrasion of right front wall of thorax, subsequent encounter
- S20.311S Abrasion of right front wall of thorax, sequela
- S20.312 Abrasion of left front wall of thoraxNon-billable
- S20.312A Abrasion of left front wall of thorax, initial encounter
- S20.312D Abrasion of left front wall of thorax, subsequent encounter
- S20.312S Abrasion of left front wall of thorax, sequela
- S20.313 Abrasion of bilateral front wall of thoraxNon-billable
- S20.313A Abrasion of bilateral front wall of thorax, initial encounter
- S20.313D Abrasion of bilateral front wall of thorax, subsequent encounter
- S20.313S Abrasion of bilateral front wall of thorax, sequela
- S20.314 Abrasion of middle front wall of thoraxNon-billable
- S20.314A Abrasion of middle front wall of thorax, initial encounter
- S20.314D Abrasion of middle front wall of thorax, subsequent encounter
- S20.314S Abrasion of middle front wall of thorax, sequela
- S20.319 Abrasion of unspecified front wall of thoraxNon-billable
- S20.319A Abrasion of unspecified front wall of thorax, initial encounter
- S20.319D Abrasion of unspecified front wall of thorax, subsequent encounter
- S20.319S Abrasion of unspecified front wall of thorax, sequela
- S20.32 Blister (nonthermal) of front wall of thoraxNon-billable
- S20.321 Blister (nonthermal) of right front wall of thoraxNon-billable
- S20.321A Blister (nonthermal) of right front wall of thorax, initial encounter
- S20.321D Blister (nonthermal) of right front wall of thorax, subsequent encounter
- S20.321S Blister (nonthermal) of right front wall of thorax, sequela
- S20.322 Blister (nonthermal) of left front wall of thoraxNon-billable
- S20.322A Blister (nonthermal) of left front wall of thorax, initial encounter
- S20.322D Blister (nonthermal) of left front wall of thorax, subsequent encounter
- S20.322S Blister (nonthermal) of left front wall of thorax, sequela
- S20.323 Blister (nonthermal) of bilateral front wall of thoraxNon-billable
- S20.323A Blister (nonthermal) of bilateral front wall of thorax, initial encounter
- S20.323D Blister (nonthermal) of bilateral front wall of thorax, subsequent encounter
- S20.323S Blister (nonthermal) of bilateral front wall of thorax, sequela
- S20.324 Blister (nonthermal) of middle front wall of thoraxNon-billable
- S20.324A Blister (nonthermal) of middle front wall of thorax, initial encounter
- S20.324D Blister (nonthermal) of middle front wall of thorax, subsequent encounter
- S20.324S Blister (nonthermal) of middle front wall of thorax, sequela
- S20.329 Blister (nonthermal) of unspecified front wall of thoraxNon-billable
- S20.329A Blister (nonthermal) of unspecified front wall of thorax, initial encounter
- S20.329D Blister (nonthermal) of unspecified front wall of thorax, subsequent encounter
- S20.329S Blister (nonthermal) of unspecified front wall of thorax, sequela
- S20.34 External constriction of front wall of thoraxNon-billable
- S20.341 External constriction of right front wall of thoraxNon-billable
- S20.341A External constriction of right front wall of thorax, initial encounter
- S20.341D External constriction of right front wall of thorax, subsequent encounter
- S20.341S External constriction of right front wall of thorax, sequela
- S20.342 External constriction of left front wall of thoraxNon-billable
- S20.342A External constriction of left front wall of thorax, initial encounter
- S20.342D External constriction of left front wall of thorax, subsequent encounter
- S20.342S External constriction of left front wall of thorax, sequela
- S20.343 External constriction of bilateral front wall of thoraxNon-billable
- S20.343A External constriction of bilateral front wall of thorax, initial encounter
- S20.343D External constriction of bilateral front wall of thorax, subsequent encounter
- S20.343S External constriction of bilateral front wall of thorax, sequela
- S20.344 External constriction of middle front wall of thoraxNon-billable
- S20.344A External constriction of middle front wall of thorax, initial encounter
- S20.344D External constriction of middle front wall of thorax, subsequent encounter
- S20.344S External constriction of middle front wall of thorax, sequela
- S20.349 External constriction of unspecified front wall of thoraxNon-billable
- S20.349A External constriction of unspecified front wall of thorax, initial encounter
- S20.349D External constriction of unspecified front wall of thorax, subsequent encounter
- S20.349S External constriction of unspecified front wall of thorax, sequela
- S20.35 Superficial foreign body of front wall of thoraxNon-billable
- S20.351 Superficial foreign body of right front wall of thoraxNon-billable
- S20.351A Superficial foreign body of right front wall of thorax, initial encounter
- S20.351D Superficial foreign body of right front wall of thorax, subsequent encounter
- S20.351S Superficial foreign body of right front wall of thorax, sequela
- S20.352 Superficial foreign body of left front wall of thoraxNon-billable
- S20.352A Superficial foreign body of left front wall of thorax, initial encounter
- S20.352D Superficial foreign body of left front wall of thorax, subsequent encounter
- S20.352S Superficial foreign body of left front wall of thorax, sequela
- S20.353 Superficial foreign body of bilateral front wall of thoraxNon-billable
- S20.353A Superficial foreign body of bilateral front wall of thorax, initial encounter
- S20.353D Superficial foreign body of bilateral front wall of thorax, subsequent encounter
- S20.353S Superficial foreign body of bilateral front wall of thorax, sequela
- S20.354 Superficial foreign body of middle front wall of thoraxNon-billable
- S20.354A Superficial foreign body of middle front wall of thorax, initial encounter
- S20.354D Superficial foreign body of middle front wall of thorax, subsequent encounter
- S20.354S Superficial foreign body of middle front wall of thorax, sequela
- S20.359 Superficial foreign body of unspecified front wall of thoraxNon-billable
- S20.359A Superficial foreign body of unspecified front wall of thorax, initial encounter
- S20.359D Superficial foreign body of unspecified front wall of thorax, subsequent encounter
- S20.359S Superficial foreign body of unspecified front wall of thorax, sequela
- S20.36 Insect bite (nonvenomous) of front wall of thoraxNon-billable
- S20.361 Insect bite (nonvenomous) of right front wall of thoraxNon-billable
- S20.361A Insect bite (nonvenomous) of right front wall of thorax, initial encounter
- S20.361D Insect bite (nonvenomous) of right front wall of thorax, subsequent encounter
- S20.361S Insect bite (nonvenomous) of right front wall of thorax, sequela
- S20.362 Insect bite (nonvenomous) of left front wall of thoraxNon-billable
- S20.362A Insect bite (nonvenomous) of left front wall of thorax, initial encounter
- S20.362D Insect bite (nonvenomous) of left front wall of thorax, subsequent encounter
- S20.362S Insect bite (nonvenomous) of left front wall of thorax, sequela
- S20.363 Insect bite (nonvenomous) of bilateral front wall of thoraxNon-billable
- S20.363A Insect bite (nonvenomous) of bilateral front wall of thorax, initial encounter
- S20.363D Insect bite (nonvenomous) of bilateral front wall of thorax, subsequent encounter
- S20.363S Insect bite (nonvenomous) of bilateral front wall of thorax, sequela
- S20.364 Insect bite (nonvenomous) of middle front wall of thoraxNon-billable
- S20.364A Insect bite (nonvenomous) of middle front wall of thorax, initial encounter
- S20.364D Insect bite (nonvenomous) of middle front wall of thorax, subsequent encounter
- S20.364S Insect bite (nonvenomous) of middle front wall of thorax, sequela
- S20.369 Insect bite (nonvenomous) of unspecified front wall of thoraxNon-billable
- S20.369A Insect bite (nonvenomous) of unspecified front wall of thorax, initial encounter
- S20.369D Insect bite (nonvenomous) of unspecified front wall of thorax, subsequent encounter
- S20.369S Insect bite (nonvenomous) of unspecified front wall of thorax, sequela
- S20.37 Other superficial bite of front wall of thoraxNon-billable
- S20.371 Other superficial bite of right front wall of thoraxNon-billable
- S20.371A Other superficial bite of right front wall of thorax, initial encounter
- S20.371D Other superficial bite of right front wall of thorax, subsequent encounter
- S20.371S Other superficial bite of right front wall of thorax, sequela
- S20.372 Other superficial bite of left front wall of thoraxNon-billable
- S20.372A Other superficial bite of left front wall of thorax, initial encounter
- S20.372D Other superficial bite of left front wall of thorax, subsequent encounter
- S20.372S Other superficial bite of left front wall of thorax, sequela
- S20.373 Other superficial bite of bilateral front wall of thoraxNon-billable
- S20.373A Other superficial bite of bilateral front wall of thorax, initial encounter
- S20.373D Other superficial bite of bilateral front wall of thorax, subsequent encounter
- S20.373S Other superficial bite of bilateral front wall of thorax, sequela
- S20.374 Other superficial bite of middle front wall of thoraxNon-billable
- S20.374A Other superficial bite of middle front wall of thorax, initial encounter
- S20.374D Other superficial bite of middle front wall of thorax, subsequent encounter
- S20.374S Other superficial bite of middle front wall of thorax, sequela
- S20.379 Other superficial bite of unspecified front wall of thoraxNon-billable
- S20.379A Other superficial bite of unspecified front wall of thorax, initial encounter
- S20.379D Other superficial bite of unspecified front wall of thorax, subsequent encounter
- S20.379S Other superficial bite of unspecified front wall of thorax, sequela
- S20.4 Other and unspecified superficial injuries of back wall of thoraxNon-billable
- S20.40 Unspecified superficial injuries of back wall of thoraxNon-billable
- S20.401 Unspecified superficial injuries of right back wall of thoraxNon-billable
- S20.401A Unspecified superficial injuries of right back wall of thorax, initial encounter
- S20.401D Unspecified superficial injuries of right back wall of thorax, subsequent encounter
- S20.401S Unspecified superficial injuries of right back wall of thorax, sequela
- S20.402 Unspecified superficial injuries of left back wall of thoraxNon-billable
- S20.402A Unspecified superficial injuries of left back wall of thorax, initial encounter
- S20.402D Unspecified superficial injuries of left back wall of thorax, subsequent encounter
- S20.402S Unspecified superficial injuries of left back wall of thorax, sequela
- S20.409 Unspecified superficial injuries of unspecified back wall of thoraxNon-billable
- S20.409A Unspecified superficial injuries of unspecified back wall of thorax, initial encounter
- S20.409D Unspecified superficial injuries of unspecified back wall of thorax, subsequent encounter
- S20.409S Unspecified superficial injuries of unspecified back wall of thorax, sequela
- S20.41 Abrasion of back wall of thoraxNon-billable
- S20.411 Abrasion of right back wall of thoraxNon-billable
- S20.411A Abrasion of right back wall of thorax, initial encounter
- S20.411D Abrasion of right back wall of thorax, subsequent encounter
- S20.411S Abrasion of right back wall of thorax, sequela
- S20.412 Abrasion of left back wall of thoraxNon-billable
- S20.412A Abrasion of left back wall of thorax, initial encounter
- S20.412D Abrasion of left back wall of thorax, subsequent encounter
- S20.412S Abrasion of left back wall of thorax, sequela
- S20.419 Abrasion of unspecified back wall of thoraxNon-billable
- S20.419A Abrasion of unspecified back wall of thorax, initial encounter
- S20.419D Abrasion of unspecified back wall of thorax, subsequent encounter
- S20.419S Abrasion of unspecified back wall of thorax, sequela
- S20.42 Blister (nonthermal) of back wall of thoraxNon-billable
- S20.421 Blister (nonthermal) of right back wall of thoraxNon-billable
- S20.421A Blister (nonthermal) of right back wall of thorax, initial encounter
- S20.421D Blister (nonthermal) of right back wall of thorax, subsequent encounter
- S20.421S Blister (nonthermal) of right back wall of thorax, sequela
- S20.422 Blister (nonthermal) of left back wall of thoraxNon-billable
- S20.422A Blister (nonthermal) of left back wall of thorax, initial encounter
- S20.422D Blister (nonthermal) of left back wall of thorax, subsequent encounter
- S20.422S Blister (nonthermal) of left back wall of thorax, sequela
- S20.429 Blister (nonthermal) of unspecified back wall of thoraxNon-billable
- S20.429A Blister (nonthermal) of unspecified back wall of thorax, initial encounter
- S20.429D Blister (nonthermal) of unspecified back wall of thorax, subsequent encounter
- S20.429S Blister (nonthermal) of unspecified back wall of thorax, sequela
- S20.44 External constriction of back wall of thoraxNon-billable
- S20.441 External constriction of right back wall of thoraxNon-billable
- S20.441A External constriction of right back wall of thorax, initial encounter
- S20.441D External constriction of right back wall of thorax, subsequent encounter
- S20.441S External constriction of right back wall of thorax, sequela
- S20.442 External constriction of left back wall of thoraxNon-billable
- S20.442A External constriction of left back wall of thorax, initial encounter
- S20.442D External constriction of left back wall of thorax, subsequent encounter
- S20.442S External constriction of left back wall of thorax, sequela
- S20.449 External constriction of unspecified back wall of thoraxNon-billable
- S20.449A External constriction of unspecified back wall of thorax, initial encounter
- S20.449D External constriction of unspecified back wall of thorax, subsequent encounter
- S20.449S External constriction of unspecified back wall of thorax, sequela
- S20.45 Superficial foreign body of back wall of thoraxNon-billable
- S20.451 Superficial foreign body of right back wall of thoraxNon-billable
- S20.451A Superficial foreign body of right back wall of thorax, initial encounter
- S20.451D Superficial foreign body of right back wall of thorax, subsequent encounter
- S20.451S Superficial foreign body of right back wall of thorax, sequela
- S20.452 Superficial foreign body of left back wall of thoraxNon-billable
- S20.452A Superficial foreign body of left back wall of thorax, initial encounter
- S20.452D Superficial foreign body of left back wall of thorax, subsequent encounter
- S20.452S Superficial foreign body of left back wall of thorax, sequela
- S20.459 Superficial foreign body of unspecified back wall of thoraxNon-billable
- S20.459A Superficial foreign body of unspecified back wall of thorax, initial encounter
- S20.459D Superficial foreign body of unspecified back wall of thorax, subsequent encounter
- S20.459S Superficial foreign body of unspecified back wall of thorax, sequela
- S20.46 Insect bite (nonvenomous) of back wall of thoraxNon-billable
- S20.461 Insect bite (nonvenomous) of right back wall of thoraxNon-billable
- S20.461A Insect bite (nonvenomous) of right back wall of thorax, initial encounter
- S20.461D Insect bite (nonvenomous) of right back wall of thorax, subsequent encounter
- S20.461S Insect bite (nonvenomous) of right back wall of thorax, sequela
- S20.462 Insect bite (nonvenomous) of left back wall of thoraxNon-billable
- S20.462A Insect bite (nonvenomous) of left back wall of thorax, initial encounter
- S20.462D Insect bite (nonvenomous) of left back wall of thorax, subsequent encounter
- S20.462S Insect bite (nonvenomous) of left back wall of thorax, sequela
- S20.469 Insect bite (nonvenomous) of unspecified back wall of thoraxNon-billable
- S20.469A Insect bite (nonvenomous) of unspecified back wall of thorax, initial encounter
- S20.469D Insect bite (nonvenomous) of unspecified back wall of thorax, subsequent encounter
- S20.469S Insect bite (nonvenomous) of unspecified back wall of thorax, sequela
- S20.47 Other superficial bite of back wall of thoraxNon-billable
- S20.471 Other superficial bite of right back wall of thoraxNon-billable
- S20.471A Other superficial bite of right back wall of thorax, initial encounter
- S20.471D Other superficial bite of right back wall of thorax, subsequent encounter
- S20.471S Other superficial bite of right back wall of thorax, sequela
- S20.472 Other superficial bite of left back wall of thoraxNon-billable
- S20.472A Other superficial bite of left back wall of thorax, initial encounter
- S20.472D Other superficial bite of left back wall of thorax, subsequent encounter
- S20.472S Other superficial bite of left back wall of thorax, sequela
- S20.479 Other superficial bite of unspecified back wall of thoraxNon-billable
- S20.479A Other superficial bite of unspecified back wall of thorax, initial encounter
- S20.479D Other superficial bite of unspecified back wall of thorax, subsequent encounter
- S20.479S Other superficial bite of unspecified back wall of thorax, sequela
- S20.9 Superficial injury of unspecified parts of thoraxNon-billable
- S20.90 Unspecified superficial injury of unspecified parts of thoraxNon-billable
- S20.90XA Unspecified superficial injury of unspecified parts of thorax, initial encounter
- S20.90XD Unspecified superficial injury of unspecified parts of thorax, subsequent encounter
- S20.90XS Unspecified superficial injury of unspecified parts of thorax, sequela
- S20.91 Abrasion of unspecified parts of thoraxNon-billable
- S20.91XA Abrasion of unspecified parts of thorax, initial encounter
- S20.91XD Abrasion of unspecified parts of thorax, subsequent encounter
- S20.91XS Abrasion of unspecified parts of thorax, sequela
- S20.92 Blister (nonthermal) of unspecified parts of thoraxNon-billable
- S20.92XA Blister (nonthermal) of unspecified parts of thorax, initial encounter
- S20.92XD Blister (nonthermal) of unspecified parts of thorax, subsequent encounter
- S20.92XS Blister (nonthermal) of unspecified parts of thorax, sequela
- S20.94 External constriction of unspecified parts of thoraxNon-billable
- S20.94XA External constriction of unspecified parts of thorax, initial encounter
- S20.94XD External constriction of unspecified parts of thorax, subsequent encounter
- S20.94XS External constriction of unspecified parts of thorax, sequela
- S20.95 Superficial foreign body of unspecified parts of thoraxNon-billable
- S20.95XA Superficial foreign body of unspecified parts of thorax, initial encounter
- S20.95XD Superficial foreign body of unspecified parts of thorax, subsequent encounter
- S20.95XS Superficial foreign body of unspecified parts of thorax, sequela
- S20.96 Insect bite (nonvenomous) of unspecified parts of thoraxNon-billable
- S20.96XA Insect bite (nonvenomous) of unspecified parts of thorax, initial encounter
- S20.96XD Insect bite (nonvenomous) of unspecified parts of thorax, subsequent encounter
- S20.96XS Insect bite (nonvenomous) of unspecified parts of thorax, sequela
- S20.97 Other superficial bite of unspecified parts of thoraxNon-billable
- S20.97XA Other superficial bite of unspecified parts of thorax, initial encounter
- S20.97XD Other superficial bite of unspecified parts of thorax, subsequent encounter
- S20.97XS Other superficial bite of unspecified parts of thorax, sequela
About the S20 Code Range
The ICD-10 code S20 series is used to classify superficial injuries of the thorax, including the chest and breast area. These codes identify specific injuries such as bruises, abrasions, blisters, foreign bodies, insect bites, and other minor wounds to the front, back, or unspecified parts of the thorax.
The category covers detailed conditions like contusions of the breast (including right, left, or unspecified), sometimes known as a nipple bruise or traumatic hematoma of the breast. It also includes various types of abrasions and blisters, which may be referred to as infected or non-infected scratches, friction burns, or traumatic blisters of the chest wall. Codes also cover superficial foreign objects like splinters or particles lodged in the skin, and different types of superficial bites, including nonvenomous insect bites commonly called bite wounds of the breast or chest wall. Each injury type is further specified by location, such as front or back of the thorax, right or left side, and status of the encounter (initial, subsequent, or sequela). This robust code set assists healthcare providers and medical coders in accurately documenting and billing for superficial thoracic injuries within clinical and administrative settings.
Questions About This Page
How many billable codes are in the S20 range?
Of the 422 codes in this range, 294 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the S20 range classify?
The range classifies superficial injury of thorax. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
