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ICD-10-CM 2027 diagnosis code

G90Disorders of autonomic nervous system

Not billable — use a more specific code

G90 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G90

G90 is the ICD-10-CM diagnosis code for disorders of autonomic nervous system. It belongs to block G89-G99 (other disorders of the nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: G90.0 (neuropathy), G90.1 ([Riley-Day]), G90.2 (syndrome), G90.3 (system), G90.4 (dysreflexia), G90.5 (I)), G90.8 (system), G90.9 (unspecified) and 2 more.

Don't report G90 together with the conditions in its Excludes1 note: dysfunction of the autonomic nervous system due to alcohol (G31.2).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under G90

Coding notes

Excludes1Not coded here — never report together with this code
  • dysfunction of the autonomic nervous system due to alcohol (G31.2)

Notes that apply from higher levels

Instructions written at a parent level also apply to G90.

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about G90

Is G90 billable?

No. G90 is a header code. Report one of its more specific subcodes instead.