ICD-10-CM 2027
ICD-10 code for Carcinoidosis
From the official ICD-10-CM alphabetic index entry “Carcinoidosis”. Page updated September 29, 2026.
About coding Carcinoidosis
The ICD-10-CM code for Carcinoidosis is E34.00 (Carcinoid syndrome, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on E34.00.
Within E34.0, choose E34.00 (unspecified) only when documentation doesn't support a more specific option: carcinoid heart syndrome (E34.01) and other carcinoid syndrome (E34.09).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 643 (Endocrine Disorders with MCC, relative weight 1.6139), DRG 644 (Endocrine Disorders with CC, relative weight 1.0044) and DRG 645 (Endocrine Disorders without CC/MCC, relative weight 0.7459), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Carcinoidosis codes (official index)
- heart E34.01 — Carcinoid heart syndrome
Common questions about Carcinoidosis ICD-10 codes
What is the ICD-10 code for Carcinoidosis?
- E34.00 — Carcinoid syndrome, unspecified. More specific codes apply when the documentation supports them: E34.01.
What is the ICD-10 code for heart carcinoidosis?
- E34.01 — Carcinoid heart syndrome.
Is E34.00 billable?
- Yes. E34.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E34.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E34.00 as a principal diagnosis.
Is E34.00 a CC or MCC?
- E34.00 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.