G21 Secondary parkinsonism

Non-billable header with 7 child codes.

Excludes1 (never code together)

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

Applies from G21 Secondary parkinsonism

Excludes1 (never code together)

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

Codes under G21

• G21.0 Malignant neuroleptic syndrome
• G21.1 Other drug-induced secondary parkinsonism
• G21.2 Secondary parkinsonism due to other external agents
• G21.3 Postencephalitic parkinsonism
• G21.4 Vascular parkinsonism
• G21.8 Other secondary parkinsonism
• G21.9 Secondary parkinsonism, unspecified

Code annotations containing back-references to G21

Back-references to G21

• Type 2 Excludes: F98.4 Stereotyped movement disorders ("movement disorders of organic origin (G20-G25)")
• Type 1 Excludes: G20.C Parkinsonism, unspecified ("secondary parkinsonism (G21.-)")
• Type 1 Excludes: R25 Abnormal involuntary movements ("specific movement disorders (G20-G26)")

Back-references to G21

• Type 2 Excludes: F98.4 Stereotyped movement disorders ("movement disorders of organic origin (G20-G25)")
• Type 1 Excludes: G20.C Parkinsonism, unspecified ("secondary parkinsonism (G21.-)")
• Type 1 Excludes: R25 Abnormal involuntary movements ("specific movement disorders (G20-G26)")

Nearby codes

• G21 Secondary parkinsonism (this code)
• G21.0 Malignant neuroleptic syndrome
• G21.1 Other drug-induced secondary parkinsonism
• G21.11 Neuroleptic induced parkinsonism
• G21.19 Other drug induced secondary parkinsonism
• G21.2 Secondary parkinsonism due to other external agents