S06.A0XA Traumatic brain compression without herniation, initial encounter

ICD-10-CM S06.A0XA: Traumatic brain compression without herniation, initial encounter

ICD-10-CM code S06.A0XA identifies traumatic brain compression without herniation during an initial encounter. Traumatic brain injury results from external mechanical forces. This code is distinct from related codes indicating brain compression with herniation or subsequent encounters. Documentation must support the specific condition, and the code maps to a Medicare Advantage risk adjustment category. 2 3 4

Plain-language overview

Traumatic brain injury is an injury to the brain resulting from an external mechanical force, and the terms TBI and closed head injury are used interchangeably. 2

What this code represents

S06.A0XA is the ICD-10-CM diagnosis code for traumatic brain compression without herniation, initial encounter, and it is distinct from S06.A1XA which indicates traumatic brain compression with herniation. 3

S06.A0XD represents a subsequent encounter for traumatic brain compression without herniation, while S06.A0XS represents a sequela, distinguishing the encounter types from the initial encounter denoted by S06.A0XA. 3

Coding details

ICD-10-CM does not list inclusion terms or Excludes 2 notes for S06.A0XA in the current effective period. 4

Documentation considerations

Coders report S06.A0XA only when provider documentation supports the specific condition described, as more specific codes within the same hierarchy can capture additional clinical detail. 4

Coverage and utilization context

S06.A0XA maps to Major Head Injury without Loss of Consciousness under the CMS-HCC V28 risk adjustment model, with a community non-dual aged RAF of 0.199. 4

For S06.A0XA to count as a valid HCC diagnosis in a given encounter, provider documentation must satisfy MEAT criteria, meaning the provider monitored, evaluated, assessed, or treated the condition during that encounter. 4

What the sources add

While S3 lists S06.A0XA alongside codes for brain compression with herniation and subsequent encounters, S4 adds that this specific code maps to a payment HCC under the CMS risk adjustment model. 3 4

Clinical context

Decompressive craniectomy has been shown to reduce intracranial pressure in traumatic brain injury patients, and patients with traumatic brain injury are at risk for venous thromboembolic disease. 1

Sources

1. Acute Management of Traumatic Brain Injury — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-25.
3. IHCP bulletin — in.gov; accessed 2026-07-25.
4. 2026 ICD-10-CM S06.A0XA: Traumatic brain | HCC 399 — hccbuddy.com; accessed 2026-07-25.