Is G36.9 a billable ICD-10-CM code?

Yes. G36.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does G36.9 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Demyelinating diseases of the central nervous system (G35-G37).

What cannot be coded together with G36.9?

G36.9 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 G36.9 (G36) and apply to it just the same.

G36.9

G36.9 — Acute disseminated demyelination, unspecified

Billable / specific codeICD-10-CM

G36.9 is a billable, specific ICD-10-CM code for acute disseminated demyelination, unspecified. It is valid for submission on a claim.

Excludes1 inherited from the categories above G36.9

These are not written on G36.9, but they bind it: a note on a category applies to every code beneath it. Billing G36.9 with anything listed here is a denial.

Written on G36 — Other acute disseminated demyelination

postinfectious encephalitis and encephalomyelitis NOS (G04.01)

Risk adjustment

G36.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 198 Multiple Sclerosis0.647 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

G36.9 is named in 11 Medicare coverage policies — 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A53052Billing and Coding: Home Health Speech-Language Pathology
A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A56551Billing and Coding: Visual Fields Testing
A56612Billing and Coding: CT of the Head

How G36.9 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G36.9.

Neuromyelitis
Demyelination, demyelinization›disseminated, acute

Code history

G36.9 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 G36. If G36.9 is not quite right, the correct code is usually one of these.

Questions about G36.9

Is G36.9 a billable ICD-10-CM code?: Yes. G36.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does G36.9 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Demyelinating diseases of the central nervous system (G35-G37).
What cannot be coded together with G36.9?: G36.9 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 G36.9 (G36) and apply to it just the same.