2026 ICD-10-CM Diagnosis Code S20Superficial injury of thorax

ICD-10-CM Codes›S00–T88›S20-S29›S20

ICD-10-CM S20
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S20 is a non-billable ICD-10-CM category code for superficial injury of thorax, so it cannot be submitted on claims. Use a more specific code from this category instead, such as S20.00XA, S20.00XD, S20.00XS, and S20.01XA.

Code Identity

ICD-10-CM Code
S20
Billable Status
No — Non-Billable Category
Code Describes
Superficial injury of thorax
Short Description
Superficial injury of thorax
Same as the full description in the CMS dataset.
Chapter
S20-S29
Injuries to the thorax

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS20-S29Injuries to the thorax
CategoryS20Superficial injury of thorax
This CodeS20Superficial injury of thorax

Specific Coding for Superficial injury of thoraxOverview

Non-specific codes like S20 require more characters. Use one of these billable codes instead:

  • S20.0 for Contusion of breast

  • S20.00 for Contusion of breast, unspecified breast

  • S20.01 for Contusion of right breast

  • S20.02 for Contusion of left breast

  • S20.1 for Other and unspecified superficial injuries of breast

  • S20.10 for Unspecified superficial injuries of breast

  • S20.11 for Abrasion of breast

  • S20.12 for Blister (nonthermal) of breast

  • S20.14 for External constriction of part of breast

  • S20.15 for Superficial foreign body of breast

  • S20.16 for Insect bite (nonvenomous) of breast

  • S20.17 for Other superficial bite of breast

  • S20.2 for Contusion of thorax

  • S20.20 for Contusion of thorax, unspecified

  • S20.21 for Contusion of front wall of thorax

  • S20.22 for Contusion of back wall of thorax

  • S20.3 for Other and unspecified superficial injuries of front wall of thorax

  • S20.30 for Unspecified superficial injuries of front wall of thorax

  • S20.31 for Abrasion of front wall of thorax

  • S20.32 for Blister (nonthermal) of front wall of thorax

  • S20.34 for External constriction of front wall of thorax

  • S20.35 for Superficial foreign body of front wall of thorax

  • S20.36 for Insect bite (nonvenomous) of front wall of thorax

  • S20.37 for Other superficial bite of front wall of thorax

  • S20.4 for Other and unspecified superficial injuries of back wall of thorax

  • S20.40 for Unspecified superficial injuries of back wall of thorax

  • S20.41 for Abrasion of back wall of thorax

  • S20.42 for Blister (nonthermal) of back wall of thorax

  • S20.44 for External constriction of back wall of thorax

  • S20.45 for Superficial foreign body of back wall of thorax

  • S20.46 for Insect bite (nonvenomous) of back wall of thorax

  • S20.47 for Other superficial bite of back wall of thorax

  • S20.9 for Superficial injury of unspecified parts of thorax

  • S20.90 for Unspecified superficial injury of unspecified parts of thorax

  • S20.91 for Abrasion of unspecified parts of thorax

  • S20.92 for Blister (nonthermal) of unspecified parts of thorax

  • S20.94 for External constriction of unspecified parts of thorax

  • S20.95 for Superficial foreign body of unspecified parts of thorax

  • S20.96 for Insect bite (nonvenomous) of unspecified parts of thorax

  • S20.97 for Other superficial bite of unspecified parts of thorax

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Superficial injury of thorax (S20). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

7th Character Note

  • The appropriate 7th character is to be added to each code from category S20

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Patient EducationClinical

Wounds and Injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S20Overview

Is S20 (Superficial injury of thorax) a billable code?

No. This is a category header that groups the codes for superficial injury of thorax, and headers cannot be submitted on claims. Claims for superficial injury of thorax need a more specific code from this category, such as S20.00XA, S20.00XD, and S20.00XS.