2026 ICD-10-CM Diagnosis Code S28.1XXATraumatic amputation (partial) of part of thorax, except breast, initial encounter

ICD-10-CM Codes›S00–T88›S20-S29›S28

ICD-10-CM S28.1XXA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S28.1XXA is a billable ICD-10-CM diagnosis code for traumatic amputation (partial) of part of thorax, except breast, 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 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 604 through 605, 963 through 965. Coders also document this condition as traumatic amputation of part of thorax. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Amputation of other body parts, initial encounter.

Code Identity

ICD-10-CM Code
S28.1XXA
Billable Status
Yes — Valid for Submission
Code Describes
Traumatic amputation (partial) of part of thorax, except breast, initial encounter
Short Description
Traumatic amp of part of thorax, except breast, init
Parent Code
S28.1
Traumatic amputation (partial) of part of thorax, except breast

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS20-S29Injuries to the thorax
CategoryS28Crushing injury of thorax, and traumatic amputation of part of thorax
This CodeS28.1XXATraumatic amputation (partial) of part of thorax, except breast, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Traumatic amputation of part of thorax

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Crushing injury of thorax, and traumatic amputation of part of thorax (S28). 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.

Clinical ClassificationClinical

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

CCSR INJ015
Amputation of other body parts, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Chest Injuries and Disorders

The chest is the part of your body between your neck and your abdomen (belly). The medical term for your chest is thorax.

The full article covers:

  • What is the chest?
  • What are chest injuries and disorders?
  • How are chest injuries and disorders diagnosed?

Read the full article at MedlinePlus

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

Convert S28.1XXA to ICD-9-CMHistory

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

ICD-9-CM
875.0 Open wound of chest
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S28.1XXAOverview

Is S28.1XXA a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report traumatic amputation (partial) of part of thorax, except breast, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S28.1XXA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for traumatic amputation (partial) of part of thorax, except breast, such as an emergency visit or first evaluation.

What MS-DRG does S28.1XXA group to?

When traumatic amputation (partial) of part of thorax, except breast, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S28.1XXA?

Under the General Equivalence Mappings, traumatic amputation (partial) of part of thorax, except breast, initial encounter converts to ICD-9-CM 875.0 (open wound of chest). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.