G21.2

G21.2: Secondary parkinsonism due to other external agents

Billable / specific codeICD-10-CM

G21.2 is a billable, specific ICD-10-CM code for secondary parkinsonism due to other external agents. It is valid for submission on a claim.

Check G21.2 with the rest of the claim: free scrubber

Code first

The underlying condition must be sequenced before this code.

(T51-T65) to identify external agent

Excludes1 inherited from the categories above G21.2

A category’s note binds every code beneath it.

Written on G21: Secondary parkinsonism

Huntington's disease (G10)
neurocognitive disorder with Lewy bodies (G31.83)
Shy-Drager syndrome (G90.3)
syphilitic Parkinsonism (A52.19)

Other codes that can never be billed with G21.2

Their own Excludes1 notes name this code, so the conflict is not listed above.

G20.CParkinsonism, unspecified

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

G21.2 is named in 12 Medicare coverage policies: 12 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A56612Billing and Coding: CT of the Head
A56619Billing and Coding: Nerve Conduction Studies and Electromyography
A56621Billing and Coding: Swallowing Studies for Dysphagia