S06.A1XS ICD-10-CM Code: Traumatic brain compression with herniation, sequela
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Injury, poisoning and certain other consequences of external causes (S00-T88) / Injuries to the head (S00-S09)
S06.A1XS
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceTraumatic brain compression with herniation, sequela
Traumatic brain compression with herniation, sequela
CMS-HCC V28
00
RAF 0
CMS-HCC V24
MappedHCC 167
RAF 0.0
ACA/HHS
00
RAF 0
ESRD/PACE
MappedHCC 167
RAF 0.0
RXHCC
00
RAF 0
Code Trumping
Basket needed
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for S06.A1XS in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for S06.A1XS in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for S06.A1XS in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for S06.A1XS in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for S06.A1XS in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for S06.A1XS in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for S06.A1XS in this effective period.
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is S06.A1XS an HCC code?
Yes. S06.A1XS maps to Major Head Injury under the V24 model but is not retained in V28.
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for S06.A1XS
For S06.A1XSto count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed S06.A1XS during that encounter, not just copy-forwarded from a problem list.
What This Code Means
S06.A1XS is the ICD-10-CM diagnosis code for traumatic brain compression with herniation, sequela. S06.A1XS sits in the ICD-10-CM chapter for injury, poisoning and certain other consequences of external causes (s00-t88), within the section covering injuries to the head (s00-s09).
Under the older CMS-HCC V24 model, S06.A1XS maps to Major Head Injury (HCC 167) with a community, non-dual, aged base RAF weight of 0.000. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Coders should report S06.A1XS only when the provider documentation supports the specific condition described, since more specific codes within the same hierarchy can capture additional clinical detail and may carry a higher RAF weight. Because S06.A1XS maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for S06.A1XS sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.