ICD10
ICD-10 Code G90.8: Other disorders of autonomic nervous system
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).
When is it used?
- May be used when a clinician documents other disorders of autonomic nervous system in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
Code hierarchy
chapter
6Diseases of the nervous system (G00-G99)
block
G89-G99Other disorders of the nervous system
category
G90Disorders of autonomic nervous system
currentG90
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
NeurologistGeneral Physician
Sibling codes
G90.0Idiopathic peripheral autonomic neuropathyG90.1Familial dysautonomia [Riley-Day]billableG90.2Horner's syndromebillableG90.3Multi-system degeneration of the autonomic nervous systembillableG90.4Autonomic dysreflexiabillableG90.5Complex regional pain syndrome I (CRPS I)G90.9Disorder of the autonomic nervous system, unspecifiedbillableG90.APostural orthostatic tachycardia syndrome [POTS]billableG90.BLMNB1-related autosomal dominant leukodystrophybillable
Mapped diagnoses and classifications
SNOMED_CT 430042004high
Acute pandysautonomia
Source: SNOMED International ICD-10 map
SNOMED_CT 1259077008high
Autoimmune disorder of autonomic nerve
Source: SNOMED International ICD-10 map
SNOMED_CT 838330008high
Autoimmune ganglionopathy
Source: SNOMED International ICD-10 map
SNOMED_CT 1259101007high
Autoimmune sensory ganglionopathy
Source: SNOMED International ICD-10 map
SNOMED_CT 1259130000high
Autonomic disorder due to substance withdrawal
Source: SNOMED International ICD-10 map
SNOMED_CT 838321000high
Autonomic ganglionopathy
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
G90.8
Replacement codes
G90.81 — Serotonin syndromeG90.89 — Other disorders of autonomic nervous system
Common synonyms
Other disorders of autonomic nervous system
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.