G21.11

Neuroleptic induced parkinsonism

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC ESRD V24

HCC78

Parkinson's and Huntington's Diseases

RxHCC V08

RXHCC161

Parkinson Disease

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · G21.11

Excludes 1

malignant neuroleptic syndrome (G21.0)

Use additional

code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)

Inherited from G21Secondary parkinsonism

Excludes 1

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

Inherited from chapter 6Diseases of the nervous system

Excludes 2

certain conditions originating in the perinatal period (P04-P96) certain infectious and parasitic diseases (A00-B99) complications of pregnancy, childbirth and the puerperium (O00-O9A) congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Official Guidelines for G21.11

FY 2026 ›

I.C.6Chapter-specific guidanceChapter 6: Diseases of the Nervous System (G00-G99)

Subsections

Find G21.11 in the alphabetic index

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