G21.0 is the authoritative medical code for Malignant neuroleptic syndrome. This classification is used in medical billing and clinical recording to specify the clinical criteria for malignant neuroleptic syndrome (ICD-10-CM G21.0), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Sequencing, inclusion, and exclusion notes published for G21.0 in the official ICD-10-CM tabular list.
Conditions that can never be reported with this code; the two are mutually exclusive.
Supplementary codes the tabular list directs you to add.
Per Excludes1 instructions, G21.0 must not be reported with: neuroleptic induced parkinsonism (G21.11); Huntington's disease (G10); neurocognitive disorder with Lewy bodies (G31.83); Shy-Drager syndrome (G90.3).
Use additional code(s) to specify: code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595).
Official ICD-10-CM classifications in the same code family as G21.0, with their registry titles.
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: