G13.2 — Systemic atrophy primarily affecting the central nervous system in myxedema
G13.2 is a billable, specific ICD-10-CM code for systemic atrophy primarily affecting the central nervous system in myxedema. It is valid for submission on a claim.
Other codes that can never be billed with G13.2
These codes carry an Excludes1 note pointing at G13.2. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G13.2 alone.
- G32.81Cerebellar ataxia in diseases classified elsewhere
Risk adjustment
G13.2 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
G13.2 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
- A56612Billing and Coding: CT of the Head
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
- A57780Billing and Coding: Psychological and Neuropsychological Tests
Code history
G13.2 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 G13. If G13.2 is not quite right, the correct code is usually one of these.
Questions about G13.2
- Is G13.2 a billable ICD-10-CM code?
- Yes. G13.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G13.2 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Systemic atrophies primarily affecting the central nervous system (G10-G14).