2026 ICD-10-CM Diagnosis Code S28.229APartial traumatic amputation of unspecified breast, initial encounter
ICD-10-CM Codes›S00–T88›S20-S29›S28
- Billable — Valid for Submission
- 7th Character A — Initial Encounter
- Chronic Condition
S28.229A is a billable ICD-10-CM diagnosis code for partial traumatic amputation of unspecified 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 breast. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Amputation of other body parts, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Traumatic amputation of breast
- Traumatic amputation of part of breast
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.
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.
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Convert S28.229A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S28.229AOverview
Is S28.229A (Partial traumatic amputation of unspecified breast) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report partial traumatic amputation of unspecified breast, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S28.229A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for partial traumatic amputation of unspecified breast, such as an emergency visit or first evaluation.
What MS-DRG does S28.229A group to?
When partial traumatic amputation of unspecified 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 S28.229A?
Under the General Equivalence Mappings, partial traumatic amputation of unspecified 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.
