Is G51.1 a billable ICD-10-CM code?

Yes. G51.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does G51.1 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Nerve, nerve root and plexus disorders (G50-G59).

What cannot be coded together with G51.1?

G51.1 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

G51.1

G51.1 — Geniculate ganglionitis

Billable / specific codeICD-10-CM

G51.1 is a billable, specific ICD-10-CM code for geniculate ganglionitis. 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.

postherpetic geniculate ganglionitis (B02.21)

Risk adjustment

G51.1 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

G51.1 is named in 9 Medicare coverage policies — 9 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A54095Billing and Coding: Nerve Conduction Studies and Electromyography
A56612Billing and Coding: CT of the Head
A56619Billing and Coding: Nerve Conduction Studies and Electromyography
A56773Billing and Coding: Neurophysiology Evoked Potentials (NEPs)

How G51.1 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 G51.1.

Ganglionitis›geniculate
Neuralgia, neuralgic›facialis vera
Neuritis›geniculate ganglion
Syndrome›ganglion›geniculi

Related codes at this level

Codes that share G51. If G51.1 is not quite right, the correct code is usually one of these.

Questions about G51.1

Is G51.1 a billable ICD-10-CM code?: Yes. G51.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does G51.1 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Nerve, nerve root and plexus disorders (G50-G59).
What cannot be coded together with G51.1?: G51.1 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.