Is G40.89 a billable ICD-10-CM code?

Yes. G40.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does G40.89 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Episodic and paroxysmal disorders (G40-G47).

What cannot be coded together with G40.89?

G40.89 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

G40.89

G40.89 — Other seizures

Billable / specific codeICD-10-CM

G40.89 is a billable, specific ICD-10-CM code for other seizures. It is valid for submission on a claim.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

post traumatic seizures (R56.1)
recurrent seizures NOS (G40.909)
seizure NOS (R56.9)

Risk adjustment

G40.89 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 201 Seizure Disorders and Convulsions0.245 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

G40.89 is named in 16 Medicare coverage policies — 16 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56551Billing and Coding: Visual Fields Testing
A56612Billing and Coding: CT of the Head
A56619Billing and Coding: Nerve Conduction Studies and Electromyography
A56631Billing and Coding: Thoracic Aortography and Carotid, Vertebral, and Subclavian Angiography

How G40.89 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 G40.89.

Seizure›specified NEC

Related codes at this level

Codes that share G40.8. If G40.89 is not quite right, the correct code is usually one of these.

Questions about G40.89

Is G40.89 a billable ICD-10-CM code?: Yes. G40.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does G40.89 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Episodic and paroxysmal disorders (G40-G47).
What cannot be coded together with G40.89?: G40.89 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.