Is G20.B2 a billable ICD-10-CM code?

Yes. G20.B2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does G20.B2 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Extrapyramidal and movement disorders (G20-G26).

What cannot be coded together with G20.B2?

G20.B2 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 G20.B2 (G20.B) and apply to it just the same.

G20.B2

G20.B2 — Parkinson's disease with dyskinesia, with fluctuations

Billable / specific codeICD-10-CM

G20.B2 is a billable, specific ICD-10-CM code for parkinson's disease with dyskinesia, with fluctuations. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Parkinson's disease with dyskinesia, with OFF episodes

Excludes1 inherited from the categories above G20.B2

These are not written on G20.B2, but they bind it: a note on a category applies to every code beneath it. Billing G20.B2 with anything listed here is a denial.

Written on G20.B — Parkinson's disease with dyskinesia

drug induced dystonia (G24.0-)

Risk adjustment

G20.B2 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 199 Parkinson and Other Degenerative Disease of Basal Ganglia0.615 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

G20.B2 is named in 25 Medicare coverage policies — 25 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52507External Infusion Pumps - Policy Article
A53064Billing and Coding: Outpatient Occupational Therapy
A53065Billing and Coding: Outpatient Physical Therapy
A54095Billing and Coding: Nerve Conduction Studies and Electromyography

How G20.B2 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 G20.B2.

Disease, diseased›Parkinson's›with dyskinesia›with›fluctuations
Disease, diseased›Parkinson's›with dyskinesia›with›OFF episodes

Code history

G20.B2 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share G20.B. If G20.B2 is not quite right, the correct code is usually one of these.

G20.B1Parkinson's disease with dyskinesia, without mention of fluctuations

Questions about G20.B2

Is G20.B2 a billable ICD-10-CM code?: Yes. G20.B2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does G20.B2 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Extrapyramidal and movement disorders (G20-G26).
What cannot be coded together with G20.B2?: G20.B2 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 G20.B2 (G20.B) and apply to it just the same.