2026 ICD-10-CM Diagnosis Code S06.A1XSTraumatic brain compression with herniation, sequela

ICD-10-CM Codes›S00–T88›S00-S09›S06

ICD-10-CM S06.A1XS
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S06.A1XS is a billable ICD-10-CM diagnosis code for traumatic brain compression with herniation, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 913 through 914. The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

Code Identity

ICD-10-CM Code
S06.A1XS
Billable Status
Yes — Valid for Submission
Code Describes
Traumatic brain compression with herniation, sequela
Short Description
Traumatic brain compression with herniation, sequela
Same as the full description in the CMS dataset.
Parent Code
S06.A1
Traumatic brain compression with herniation

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS06Intracranial injury
This CodeS06.A1XSTraumatic brain compression with herniation, sequela

Code EditsBilling

Medicare Code Editor checks that affect claim validity for S06.A1XS.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

S06.A1XS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Intracranial injury (S06). 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 INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement S06.A1XS replaces the following previously assigned code(s):

  • S06.890D - Intcran inj w/o loss of consciousness, subs encntr
  • S06.899S - Intcran inj w LOC of unsp duration, sequela
FY 2022AddedAdded to the ICD-10-CM code setEffective October 1, 2021.
FY 2023–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S06.A1XSOverview

Is S06.A1XS (Traumatic brain compression with herniation) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report traumatic brain compression with herniation, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in S06.A1XS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the traumatic brain compression with herniation itself has resolved, not the original event.

What MS-DRG does S06.A1XS group to?

On inpatient claims, traumatic brain compression with herniation, sequela maps to MS-DRG 913, 914, with relative weights from 0.8855 to 1.6346 depending on complications. Higher weights mean higher Medicare reimbursement.

Can S06.A1XS be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because traumatic brain compression with herniation, sequela describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is S06.A1XS exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for traumatic brain compression with herniation, sequela on inpatient claims.

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.