Is G45.4 a billable ICD-10-CM code?

Yes. G45.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does G45.4 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 G45.4?

G45.4 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

G45.4

G45.4 — Transient global amnesia

Billable / specific codeICD-10-CM

G45.4 is a billable, specific ICD-10-CM code for transient global amnesia. 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.

amnesia NOS (R41.3)

Other codes that can never be billed with G45.4

These codes carry an Excludes1 note pointing at G45.4. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G45.4 alone.

R41.3Other amnesia

Risk adjustment

G45.4 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

G45.4 is named in 18 Medicare coverage policies — 18 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52992Billing and Coding: Non-Invasive Cerebrovascular Arterial Studies
A52992Billing and Coding: Non-Invasive Cerebrovascular Arterial Studies
A56551Billing and Coding: Visual Fields Testing
A56612Billing and Coding: CT of the Head

How G45.4 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 G45.4.

Amnesia›transient global

Related codes at this level

Codes that share G45. If G45.4 is not quite right, the correct code is usually one of these.

Questions about G45.4

Is G45.4 a billable ICD-10-CM code?: Yes. G45.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does G45.4 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 G45.4?: G45.4 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.