ICD-10-CM · Chapter 6 · G00-G99
G90 Disorders of autonomic nervous system
Excludes 1 (cannot be coded together)
- dysfunction of the autonomic nervous system due to alcohol (G31.2)
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| G90..0 | Idiopathic peripheral autonomic neuropathy | No |
| G90..01 | Carotid sinus syncope | Yes |
| G90..09 | Other idiopathic peripheral autonomic neuropathy | Yes |
| G90..1 | Familial dysautonomia [Riley-Day] | Yes |
| G90..2 | Horner's syndrome | Yes |
| G90..3 | Multi-system degeneration of the autonomic nervous system | Yes |
| G90..4 | Autonomic dysreflexia | Yes |
| G90..5 | Complex regional pain syndrome I (CRPS I) | No |
| G90..50 | Complex regional pain syndrome I, unspecified | Yes |
| G90..51 | Complex regional pain syndrome I of upper limb | No |
| G90..511 | Complex regional pain syndrome I of right upper limb | Yes |
| G90..512 | Complex regional pain syndrome I of left upper limb | Yes |
| G90..513 | Complex regional pain syndrome I of upper limb, bilateral | Yes |
| G90..519 | Complex regional pain syndrome I of unspecified upper limb | Yes |
| G90..52 | Complex regional pain syndrome I of lower limb | No |
| G90..521 | Complex regional pain syndrome I of right lower limb | Yes |
| G90..522 | Complex regional pain syndrome I of left lower limb | Yes |
| G90..523 | Complex regional pain syndrome I of lower limb, bilateral | Yes |
| G90..529 | Complex regional pain syndrome I of unspecified lower limb | Yes |
| G90..59 | Complex regional pain syndrome I of other specified site | Yes |
| G90..8 | Other disorders of autonomic nervous system | No |
| G90..81 | Serotonin syndrome | Yes |
| G90..89 | Other disorders of autonomic nervous system | Yes |
| G90..9 | Disorder of the autonomic nervous system, unspecified | Yes |
| G90..A | Postural orthostatic tachycardia syndrome [POTS] | Yes |
| G90..B | LMNB1-related autosomal dominant leukodystrophy | Yes |
Last reviewed: September 2026