ICD-10-CM 2027 diagnosis code

G12Spinal muscular atrophy and related syndromes

Not billable — use a more specific code

G12 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G12

G12 is the ICD-10-CM diagnosis code for spinal muscular atrophy and related syndromes. It belongs to block G10-G14 (systemic atrophies primarily affecting the central nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: G12.0 ([Werdnig-Hoffman]), G12.1 (atrophy), G12.2 (disease), G12.8 (syndromes) and G12.9 (unspecified).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under G12

Notes that apply from higher levels

Instructions written at a parent level also apply to G12.

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Code history

2016
2017
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2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about G12

Is G12 billable?: No. G12 is a header code. Report one of its more specific subcodes instead.