G21 SECONDARY PARKINSONISM

Code Information

  • Diagnosis Code: G21
  • Short Description: Secondary parkinsonism
  • Long Description: Secondary parkinsonism
  • Code Version: 2025 ICD-10-CM

The code G21 is NOT VALID for claim submission

Code Classification

References to Index of Diseases and Injuries

The code G21 has the following ICD-10-CM references to the Index of Diseases and Injuries

  • Type 1 Excludes Notes:
    • Huntington's disease (@G10*)
    • neurocognitive disorder with Lewy bodies (@G31.83*)
    • Shy-Drager syndrome (@G90.3*)
    • syphilitic Parkinsonism (@A52.19*)

Similar Codes

ICD-10 Code ICD-10 Description
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
G21.3 Postencephalitic parkinsonism
G21.4 Vascular parkinsonism
G21.8 Other secondary parkinsonism
G21.9 Secondary parkinsonism, unspecified
This page was last updated on: 10/1/2025
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