Is G83.21 a billable ICD-10-CM code?

Yes. G83.21 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does G83.21 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Cerebral palsy and other paralytic syndromes (G80-G83).

What cannot be coded together with G83.21?

G83.21 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 G83.21 (G83.2) and apply to it just the same.

G83.21

G83.21 — Monoplegia of upper limb affecting right dominant side

Billable / specific codeICD-10-CMright

G83.21 is a billable, specific ICD-10-CM code for monoplegia of upper limb affecting right dominant side. It is valid for submission on a claim.

Excludes1 inherited from the categories above G83.21

These are not written on G83.21, but they bind it: a note on a category applies to every code beneath it. Billing G83.21 with anything listed here is a denial.

Written on G83.2 — Monoplegia of upper limb

monoplegia of upper limbs due to sequela of cerebrovascular disease (I69.03-, I69.13-, I69.23-, I69.33-, I69.83-, I69.93-)

Risk adjustment

G83.21 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 254 Monoplegia, Other Paralytic Syndromes0.321 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

G83.21 is named in 30 Medicare coverage policies — 30 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
A53057Billing and Coding: Home Health Occupational Therapy
A53058Billing and Coding: Home Health Physical Therapy
A53064Billing and Coding: Outpatient Occupational Therapy

Code history

G83.21 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 G83.2. If G83.21 is not quite right, the correct code is usually one of these.

Questions about G83.21

Is G83.21 a billable ICD-10-CM code?: Yes. G83.21 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does G83.21 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Cerebral palsy and other paralytic syndromes (G80-G83).
What cannot be coded together with G83.21?: G83.21 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 G83.21 (G83.2) and apply to it just the same.