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ICD-10-CM Codes G00-G99 G20-G26 G21 G21.0
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ICD-10-CM Diagnosis Code G21.0

Effective Date: 10/01/2015 To 09/30/2025

Malignant neuroleptic syndrome

CMS-HCC-V24 CMS-HCC-V28 RxHCC Age Gender Maternity Acute or Chronic MCC
-- -- -- -- -- -- Acute Yes
Use Additional for G21.0:

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

Excludes-1 for G21.0:

  • neuroleptic induced parkinsonism (G21.11)

Back-references to G21.0
  • Syndrome see also Disease
    • malignant
      • neuroleptic G21.0
      • Related Medications for G21.0

      • bromocriptine, dantrolene

      Chapter, Section and Diagnosis Prefix for G21.0
        G00-G99 :

        Diseases of the nervous system

        G20-G26 :

        Extrapyramidal and movement disorders

        G21 :

        Secondary parkinsonism