Is G90.89 a billable ICD-10-CM code?

Yes. G90.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does G90.89 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Other disorders of the nervous system (G89-G99).

What cannot be coded together with G90.89?

G90.89 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above G90.89 (G90) and apply to it just the same.

G90.89

G90.89 — Other disorders of autonomic nervous system

Billable / specific codeICD-10-CM

G90.89 is a billable, specific ICD-10-CM code for other disorders of autonomic nervous system. It is valid for submission on a claim.

Excludes1 inherited from the categories above G90.89

These are not written on G90.89, but they bind it: a note on a category applies to every code beneath it. Billing G90.89 with anything listed here is a denial.

Written on G90 — Disorders of autonomic nervous system

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

Risk adjustment

G90.89 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

G90.89 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56612Billing and Coding: CT of the Head
A56619Billing and Coding: Nerve Conduction Studies and Electromyography
A56771Billing and Coding: Special Electroencephalography
A57668Billing and Coding: Nerve Conduction Studies and Electromyography

How G90.89 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G90.89.

Steinbrocker's syndrome
Sympatheticotonia
Compression›sympathetic nerve NEC
Imbalance›autonomic
Imbalance›sympathetic
Irritable, irritability›sympathetic
Irritation›peripheral autonomic nervous system
Irritation›sympathetic nerve NEC
Paralysis, paralytic›sympathetic
Paralysis, paralytic›vasomotor NEC
Syndrome›hand-shoulder
Compression›nerve›sympathetic

Code history

What changed, and when. Derived by diffing consecutive CMS release files — which matters when you are defending a code assigned under an earlier edition.

addedFY2024-FY2026
Other disorders of autonomic nervous system

Related codes at this level

Codes that share G90.8. If G90.89 is not quite right, the correct code is usually one of these.

G90.81Serotonin syndrome

Questions about G90.89

Is G90.89 a billable ICD-10-CM code?: Yes. G90.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does G90.89 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Other disorders of the nervous system (G89-G99).
What cannot be coded together with G90.89?: G90.89 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above G90.89 (G90) and apply to it just the same.