G21..0 Malignant neuroleptic syndrome

Billable

Excludes 1 (cannot be coded together)

  • neuroleptic induced parkinsonism (G21.11)

Use Additional Code

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

Last reviewed: September 2026