2027 ICD-10-CM Diagnosis Code G90Disorders of autonomic nervous system

ICD-10-CM Codes›G00–G99›G89-G99›G90

ICD-10-CM G90
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G90 is a non-billable ICD-10-CM category code for disorders of autonomic nervous system, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G90.01, G90.09, G90.1, and G90.2.

Code Identity

ICD-10-CM Code
G90
Billable Status
No — Non-Billable Category
Code Describes
Disorders of autonomic nervous system
Short Description
Disorders of autonomic nervous system
Same as the full description in the CMS dataset.
Chapter
G89-G99
Other disorders of the nervous system

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG90Disorders of autonomic nervous system
This CodeG90Disorders of autonomic nervous system

Specific Coding for Disorders of autonomic nervous systemOverview

Non-specific codes like G90 require more characters. Use one of these billable codes instead:

  • G90.0 for Idiopathic peripheral autonomic neuropathy

  • Use G90.01 for Carotid sinus syncope

  • Use G90.09 for Other idiopathic peripheral autonomic neuropathy

  • Use G90.1 for Familial dysautonomia [Riley-Day]

  • Use G90.2 for Horner's syndrome

  • Use G90.3 for Multi-system degeneration of the autonomic nervous system

  • Use G90.4 for Autonomic dysreflexia

  • G90.5 for Complex regional pain syndrome I (CRPS I)

  • Use G90.50 for Complex regional pain syndrome I, unspecified

  • G90.51 for Complex regional pain syndrome I of upper limb

  • G90.52 for Complex regional pain syndrome I of lower limb

  • Use G90.59 for Complex regional pain syndrome I of other specified site

  • G90.8 for Other disorders of autonomic nervous system

  • Use G90.81 for Serotonin syndrome

  • Use G90.89 for Other disorders of autonomic nervous system

  • Use G90.9 for Disorder of the autonomic nervous system, unspecified

  • Use G90.A for Postural orthostatic tachycardia syndrome [POTS]

  • Use G90.B for LMNB1-related autosomal dominant leukodystrophy

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G90: its own notes plus those printed at Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • dysfunction of the autonomic nervous system due to alcohol (G31.2)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Patient EducationClinical

Autonomic Nervous System Disorders

Your autonomic nervous system is the part of your nervous system that controls involuntary actions, such as the beating of your heart and the widening or narrowing of your blood vessels. When something goes wrong in this system, it can cause serious problems, including:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G90Overview

What is the ICD-10 code for disorders of autonomic nervous system?

G90 is the ICD-10-CM category for disorders of autonomic nervous system, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is G90 (Disorders of autonomic nervous system) a billable code?

No. This is a category header that groups the codes for disorders of autonomic nervous system, and headers cannot be submitted on claims. Claims for disorders of autonomic nervous system need a more specific code from this category, such as G90.01, G90.09, and G90.1.

Can G90 be reported with G31.2?

Not as a rule. The Excludes1 note on G90 lists "dysfunction of the autonomic nervous system due to alcohol (G31.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).