G90 ICD-10-CA category: Disorders of autonomic nervous system
G90 isn’t a code on its own. Choose one of the 13 codes beneath it, the one the documentation supports.
Official description
G90Disorders of autonomic nervous system
ICD-10-CA · Canada
Codes in G90
G90 isn’t a code on its own. Open the group that matches what the note documents.
G90.0Idiopathic peripheral autonomic neuropathyG90.1Familial dysautonomia [Riley-Day]G90.2Horner's syndromeG90.4Autonomic dysreflexiaG90.5Complex regional pain syndrome, type I (3 codes)G90.6Complex regional pain syndrome, type II (3 codes)G90.7Complex regional pain syndrome, other and unspecified typeG90.8Other disorders of autonomic nervous systemG90.9Disorder of autonomic nervous system, unspecifiedNotes for G90
As CIHI prints them, with any note G90 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Dysfunction of autonomic nervous system due to alcohol (G31.2)
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 6: Diseases of the nervous system (G00-G99)
Where G90 sits
- 1ChapterChapter 6: Diseases of the nervous system (G00-G99)
- 2Block G90-G99Other disorders of the nervous system
- 3Category G90Disorders of autonomic nervous system
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is G90 a valid ICD-10-CA code?
No. G90 (Disorders of autonomic nervous system) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 13 codes; record the one the documentation supports.
Where is G90 in ICD-10-CA?
G90 sits under G90-G99 Other disorders of the nervous system, within Chapter 6: Diseases of the nervous system (G00-G99).
What coding notes apply to G90?
ICD-10-CA lists Excludes notes for G90, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside G90
View G90-G99G91HydrocephalusG92Toxic encephalopathyG93Other disorders of brainG94Other disorders of brain in diseases classified elsewhereG95Other diseases of spinal cordG96Other disorders of central nervous systemG97Postprocedural disorders of nervous system, not elsewhere classifiedG98Other disorders of nervous system, not elsewhere classifiedG99Other disorders of nervous system in diseases classified elsewhere