G12.0 — Infantile spinal muscular atrophy, type I [Werdnig-Hoffman]
G12.0 is a billable, specific ICD-10-CM code for infantile spinal muscular atrophy, type i [werdnig-hoffman]. It is valid for submission on a claim.
Risk adjustment
G12.0 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 190 Amyotrophic Lateral Sclerosis and Other Motor Neuron Disease, Spinal Muscular Atrophy1.175 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
G12.0 is named in 17 Medicare coverage policies — 17 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52494High Frequency Chest Wall Oscillation Devices - Policy Article
- A52510Mechanical In-exsufflation Devices - Policy Article
- A53057Billing and Coding: Home Health Occupational Therapy
- A53064Billing and Coding: Outpatient Occupational Therapy
How G12.0 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 G12.0.
- Werdnig-Hoffmann syndrome(muscular atrophy)
- Atrophy, atrophic›Werdnig-Hoffmann
- Disease, diseased›Werdnig-Hoffmann
- Syndrome›Hoffmann-Werdnig
- Syndrome›Werdnig-Hoffman
- Atrophy, atrophic›muscle, muscular›infantile spinal
- Atrophy, atrophic›muscle, muscular›progressive›infantile(spinal)
- Atrophy, atrophic›muscle, muscular›spinal›infantile, type I(Werdnig-Hoffmann)
- Atrophy, atrophic›muscle, muscular›progressive›spinal›infantile
Related codes at this level
Codes that share G12. If G12.0 is not quite right, the correct code is usually one of these.
Questions about G12.0
- Is G12.0 a billable ICD-10-CM code?
- Yes. G12.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G12.0 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).