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G21.0 - Malignant neuroleptic syndrome


The ICD 10 Code for Malignant neuroleptic syndrome is listed as G21.0.
Additional information concerning this code and description can be found below including ICD 9 crosswalks / GEMS, chapter information, and DRGs where available.

ICD 10 CM Field Value
Diagnosis Code: G21.0
Description: Malignant neuroleptic syndrome
  • Use additional code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)
  • Excludes1: neuroleptic induced parkinsonism (G21.11)
Diagnostic Related Groups
(MS-DRG v30.0)
091 - Other Disorders Of Nervous System W Mcc
092 - Other Disorders Of Nervous System W Cc
093 - Other Disorders Of Nervous System W/o Cc/mcc
Chapter Diseases of the nervous system (G00-G99)
Block Extrapyramidal and movement disorders (G20-G26)
Parent G21 - Secondary parkinsonism
ICD-9-CM Diagnosis Codes General Equivalence Mappings (GEMS):
ICD 9 Dx Code: 333.92 - Neuroleptic malignant syndrome
ICD-10-CM Siblings (same level / similar specificity) of G21.0:
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