2026 ICD-10-CM Diagnosis Code S00.03XAContusion of scalp, initial encounter

ICD-10-CM Codes›S00–T88›S00-S09›S00

ICD-10-CM S00.03XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S00.03XA is a billable ICD-10-CM diagnosis code for contusion of scalp, 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 scalp. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Superficial injury; contusion, initial encounter.

Code Identity

ICD-10-CM Code
S00.03XA
Billable Status
Yes — Valid for Submission
Code Describes
Contusion of scalp, initial encounter
Short Description
Contusion of scalp, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S00.03
Contusion of scalp

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS00Superficial injury of head
This CodeS00.03XAContusion of scalp, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Contusion of scalp
  • Hematoma of occipital scalp
  • Hematoma of scalp

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Superficial injury of head (S00). 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 S00.03XA to ICD-9-CMHistory

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

ICD-9-CM
920 Contusion face/scalp/nck
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 S00.03XAOverview

Is S00.03XA (Contusion of scalp) a billable code?

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

What does the 7th character A in S00.03XA mean?

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

What MS-DRG does S00.03XA group to?

When contusion of scalp, 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 S00.03XA?

Under the General Equivalence Mappings, contusion of scalp, initial encounter converts to ICD-9-CM 920 (contusion face/scalp/nck). 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.