2026 ICD-10-CM Diagnosis Code S28.222APartial traumatic amputation of left breast, initial encounter

ICD-10-CM Codes›S00–T88›S20-S29›S28

ICD-10-CM S28.222A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S28.222A is a billable ICD-10-CM diagnosis code for partial traumatic amputation of left 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Amputation of other body parts, initial encounter.

Code Identity

ICD-10-CM Code
S28.222A
Billable Status
Yes — Valid for Submission
Code Describes
Partial traumatic amputation of left breast, initial encounter
Short Description
Partial traumatic amputation of left breast, init encntr
Parent Code
S28.222
Partial traumatic amputation of left 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 CodeS28.222APartial traumatic amputation of left breast, initial encounter

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

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.

Convert S28.222A to ICD-9-CMHistory

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

ICD-9-CM
879.0 Open wound of breast
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 S28.222AOverview

Is S28.222A (Partial traumatic amputation of left breast) a billable code?

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

What does the 7th character A in S28.222A mean?

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

What MS-DRG does S28.222A group to?

When partial traumatic amputation of left 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 S28.222A?

Under the General Equivalence Mappings, partial traumatic amputation of left breast, initial encounter converts to ICD-9-CM 879.0 (open wound of breast). 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.