2027 ICD-10-CM Diagnosis Code S30.820ABlister (nonthermal) of lower back and pelvis, initial encounter

ICD-10-CM Codes›S00–T88›S30-S39›S30

ICD-10-CM S30.820A
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S30.820A is a billable ICD-10-CM diagnosis code for blister (nonthermal) of lower back and pelvis, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Superficial injury; contusion, initial encounter.

Code Identity

ICD-10-CM Code
S30.820A
Billable Status
Yes — Valid for Submission
Code Describes
Blister (nonthermal) of lower back and pelvis, initial encounter
Short Description
Blister (nonthermal) of lower back and pelvis, init encntr
Parent Code
S30.820
Blister (nonthermal) of lower back and pelvis

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS30-S39Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
CategoryS30Superficial injury of abdomen, lower back, pelvis and external genitals
This CodeS30.820ABlister (nonthermal) of lower back and pelvis, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Blister of back with infection
  • Blister of buttock with infection
  • Blister of buttock without infection
  • Blister of lower back with infection
  • Blister of perineum with infection
  • Sacral blister with infection
  • Superficial injury of skin of sacral region
  • Traumatic blister of back
  • Traumatic blister of buttock
  • Traumatic blister of low back
  • Traumatic blister of pelvic region
  • Traumatic blister of perineum
  • Traumatic blister of perineum, infected
  • Traumatic blister of sacrum

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Superficial injury of abdomen, lower back, pelvis and external genitals (S30). 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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to S30.820A: its own notes plus those printed at S30, block S30-S39, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals applies to 2,679 codes
  • injuries to the abdominal wall
  • injuries to the anus
  • injuries to the buttock
  • injuries to the external genitalia
  • injuries to the flank
  • injuries to the groin

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From S30 Superficial injury of abdomen, lower back, pelvis and external genitals applies to 216 codes
  • superficial injury of hip (S70.-)
From Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals applies to 2,679 codes
  • burns and corrosions (T20-T32)
  • effects of foreign body in anus and rectum (T18.5)
  • effects of foreign body in genitourinary tract (T19.-)
  • effects of foreign body in stomach, small intestine and colon (T18.2-T18.4)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From S30 Superficial injury of abdomen, lower back, pelvis and external genitals applies to 216 codes
  • The appropriate 7th character is to be added to each code from category S30
Values for category S30 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ017
Superficial injury; contusion, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Blisters

Blisters are fluid-filled sacs on the outer layer of your skin. They form because of rubbing, heat, or diseases of the skin. They are most common on your hands and feet.

The full article covers:

  • What are blisters?
  • What causes blisters?
  • What are the treatments for blisters?
  • Can blisters be prevented?

Read the full article at MedlinePlus

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

Convert S30.820A to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
911.2 Blister trunk
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S30.820AOverview

What is the ICD-10 code for blister (nonthermal) of lower back and pelvis, initial encounter?

The ICD-10-CM code for blister (nonthermal) of lower back and pelvis, initial encounter is S30.820A (sometimes written as S30820A). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is S30.820A (Blister (nonthermal) of lower back and pelvis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report blister (nonthermal) of lower back and pelvis, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in S30.820A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for blister (nonthermal) of lower back and pelvis, such as an emergency visit or first evaluation.

What MS-DRG does S30.820A group to?

When blister (nonthermal) of lower back and pelvis, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 964, 965, 607, 963, 606, with relative weights from 0.8772 to 2.6361 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S30.820A?

Under the General Equivalence Mappings, blister (nonthermal) of lower back and pelvis, initial encounter converts to ICD-9-CM 911.2 (blister trunk). The mapping is approximate, so confirm the match fits the documentation.