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ICD-10-CM 2027

ICD-10 code for malignant syndrome

Choose a code from the options below based on the documentation.

From the official ICD-10-CM alphabetic index entry “Syndrome › malignant”. Page updated September 29, 2026.

About coding malignant syndrome

The official ICD-10-CM index doesn't give a single default code for malignant syndrome; the code depends on the details below.

More specific malignant syndrome codes (official index)

  • carcinoid E34.00 — Carcinoid syndrome, unspecified
  • neuroleptic G21.0 — Malignant neuroleptic syndrome

Common questions about malignant syndrome ICD-10 codes

What is the ICD-10 code for carcinoid malignant syndrome?

E34.00 — Carcinoid syndrome, unspecified.

What is the ICD-10 code for neuroleptic malignant syndrome?

G21.0 — Malignant neuroleptic syndrome.