G90.9 — Disorder of the autonomic nervous system, unspecified
G90.9 is a billable, specific ICD-10-CM code for disorder of the autonomic nervous system, unspecified. It is valid for submission on a claim.
Risk adjustment
G90.9 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
G90.9 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56612Billing and Coding: CT of the Head
- A56619Billing and Coding: Nerve Conduction Studies and Electromyography
- A57668Billing and Coding: Nerve Conduction Studies and Electromyography
How G90.9 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 G90.9.
- Disease, diseased›sympathetic nervous system
- Disorder›autonomic nervous system
- Disturbance›sympathetic(nerve)
- Degeneration, degenerative›nervous system›autonomic
- Disease, diseased›nervous system›autonomic
- Disease, diseased›nervous system›parasympathetic
- Disease, diseased›nervous system›sympathetic
- Disease, diseased›nervous system›vegetative
- Disease, diseased›peripheral›autonomic nervous system
- Disorder›nerve›sympathetic
- Disorder›nervous system›autonomic(peripheral)
- Disorder›nervous system›parasympathetic
Related codes at this level
Codes that share G90. If G90.9 is not quite right, the correct code is usually one of these.
- G90.0Idiopathic peripheral autonomic neuropathy
- G90.1Familial dysautonomia [Riley-Day]
- G90.2Horner's syndrome
- G90.3Multi-system degeneration of the autonomic nervous system
- G90.4Autonomic dysreflexia
- G90.5Complex regional pain syndrome I (CRPS I)
- G90.8Other disorders of autonomic nervous system
- G90.APostural orthostatic tachycardia syndrome [POTS]
- G90.BLMNB1-related autosomal dominant leukodystrophy
Questions about G90.9
- Is G90.9 a billable ICD-10-CM code?
- Yes. G90.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G90.9 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Other disorders of the nervous system (G89-G99).