ICD-10-CM Codes Browse (Tabular) Diagnostic External Drug Neoplasm

G21.3 – Postencephalitic parkinsonism

Coding Notes

Active

Billable, valid for HIPAA-covered transactions

GEM Conversion to ICD-9 CM

332.1

Fs: 10000 – Secondary parkinsonism

MDC / MS-DRG Reference

DRG 056

DEGENERATIVE NERVOUS SYSTEM DISORDERS WITH MCC

DRG 057

DEGENERATIVE NERVOUS SYSTEM DISORDERS WITHOUT MCC

Back Reference of Diagnostic Codes

Parkinsonism (idiopathic) (primary) G20

postencephalitic G21.3

secondary G21.9

due to

encephalitis G21.3

Sibling Codes

G21.0

Malignant neuroleptic syndrome

G21.1

Other drug-induced secondary parkinsonism

G21.2

Secondary parkinsonism due to other external agents

G21.4

Vascular parkinsonism

G21.8

Other secondary parkinsonism

G21.9

Secondary parkinsonism, unspecified

Parent Sibling Codes

G20

Parkinson's disease

G21

Secondary parkinsonism

G23

Other degenerative diseases of basal ganglia

G24

G25

Other extrapyramidal and movement disorders

G26

Extrapyramidal and movement disorders in diseases classified elsewhere

View in Tabular

Code	Title
G00-G99	Diseases of the nervous system (G00-G99)
G20-G26	Extrapyramidal and movement disorders (G20-G26)
G21	Secondary parkinsonism
G21.3	Postencephalitic parkinsonism