G90.9
Disorder of the autonomic nervous system, unspecified
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 9 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 9 never code together
G00-G99chapter
Excludes2
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes
No further instructional notes apply.
Index entries leading here 5
Alongside this code 9 same parent — G90
G90.0 Idiopathic peripheral autonomic neuropathy category G90.1 Familial dysautonomia [Riley-Day] G90.2 Horner's syndrome G90.3 Multi-system degeneration of the autonomic nervous system G90.4 Autonomic dysreflexia G90.5 Complex regional pain syndrome I (CRPS I) category G90.8 Other disorders of autonomic nervous system category G90.A Postural orthostatic tachycardia syndrome [POTS] G90.B LMNB1-related autosomal dominant leukodystrophy
Medications 5
16 Autonomic Nervous System Diseases drugs 1336 Nervous System Diseases drugs 131 Nervous System Neoplasms drugs 12 Nervous System Malformations drugs 693 Central Nervous System Diseases drugs
MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.