2026 ICD-10-CM Diagnosis Code S20.00XAContusion of breast, unspecified breast, initial encounter

ICD-10-CM Codes›S00–T88›S20-S29›S20

ICD-10-CM S20.00XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S20.00XA is a billable ICD-10-CM diagnosis code for contusion of breast, 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 contusion of breast. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Superficial injury; contusion, initial encounter.

Code Identity

ICD-10-CM Code
S20.00XA
Billable Status
Yes — Valid for Submission
Code Describes
Contusion of breast, unspecified breast, initial encounter
Short Description
Contusion of breast, unspecified breast, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S20.00
Contusion of breast, unspecified breast

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS20-S29Injuries to the thorax
CategoryS20Superficial injury of thorax
This CodeS20.00XAContusion of breast, unspecified breast, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Contusion of breast
  • Nipple bruised

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.

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

Bruises

A bruise is a mark on your skin caused by blood trapped under the surface. It happens when an injury crushes small blood vessels but does not break the skin. Those vessels break open and leak blood under the skin.

Read the full article at MedlinePlus

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

Convert S20.00XA to ICD-9-CMHistory

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

ICD-9-CM
922.0 Contusion 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 S20.00XAOverview

Is S20.00XA (Contusion of breast, unspecified breast) a billable code?

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

What does the 7th character A in S20.00XA mean?

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

What MS-DRG does S20.00XA group to?

When contusion of breast, 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 S20.00XA?

Under the General Equivalence Mappings, contusion of breast, unspecified breast, initial encounter converts to ICD-9-CM 922.0 (contusion of breast). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.