Is S06.6X6A a billable ICD-10-CM code?

Yes. S06.6X6A is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does S06.6X6A sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the head (S00-S09).

What cannot be coded together with S06.6X6A?

S06.6X6A carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above S06.6X6A (S06) and apply to it just the same.

S06.6X6A

S06.6X6A — Traumatic subarachnoid hemorrhage with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter

Billable / specific codeICD-10-CM

S06.6X6A is a billable, specific ICD-10-CM code for traumatic subarachnoid hemorrhage with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

The appropriate 7th character is to be added to each code from category S06, except as noted below

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above S06.6X6A

These are not written on S06.6X6A, but they bind it: a note on a category applies to every code beneath it. Billing S06.6X6A with anything listed here is a denial.

Written on S06 — Intracranial injury

head injury NOS (S09.90)

Other codes that can never be billed with S06.6X6A

These codes carry an Excludes1 note pointing at S06.6X6A. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading S06.6X6A alone.

G31.84Mild cognitive impairment of uncertain or unknown etiology
I69Sequelae of cerebrovascular disease
I69.8Sequelae of other cerebrovascular diseases
I69.9Sequelae of unspecified cerebrovascular diseases
S09.0Injury of blood vessels of head, not elsewhere classified
S09.0XXAInjury of blood vessels of head, not elsewhere classified, initial encounter
S09.0XXDInjury of blood vessels of head, not elsewhere classified, subsequent encounter
S09.0XXSInjury of blood vessels of head, not elsewhere classified, sequela

Risk adjustment

S06.6X6A risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 397 Major Head Injury with Loss of Consciousness > 1 Hour0.199 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

S06.6X6A is named in 14 Medicare coverage policies — 14 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56537Billing and Coding: Scanning Computerized Ophthalmic Diagnostic Imaging (SCODI)
A56612Billing and Coding: CT of the Head
A56631Billing and Coding: Thoracic Aortography and Carotid, Vertebral, and Subclavian Angiography
A56747Billing and Coding: Magnetic Resonance Angiography (MRA)

Code history

S06.6X6A has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share S06.6X6. If S06.6X6A is not quite right, the correct code is usually one of these.

Questions about S06.6X6A

Is S06.6X6A a billable ICD-10-CM code?: Yes. S06.6X6A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does S06.6X6A sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the head (S00-S09).
What cannot be coded together with S06.6X6A?: S06.6X6A carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above S06.6X6A (S06) and apply to it just the same.