ICD-10-CM 2027 diagnosis code

E34.0Carcinoid syndrome

Not billable — use a more specific code

E34.0 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code last changed in FY2025 (effective October 1, 2024). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About E34.0

E34.0 is the ICD-10-CM diagnosis code for carcinoid syndrome. It belongs to category E34 (other endocrine disorders), block E20-E35 (disorders of other endocrine glands) and chapter 4 (endocrine, nutritional and metabolic diseases). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within E34 (other endocrine disorders), E34.0 is specifically for carcinoid syndrome. Related codes cover other hypersecretion of intestinal hormones (E34.1), ectopic hormone secretion, not elsewhere classified (E34.2), short stature due to endocrine disorder (E34.3), constitutional tall stature (E34.4), androgen insensitivity syndrome (E34.5), other specified endocrine disorders (E34.8) and endocrine disorder, unspecified (E34.9).

To report this condition, pick the subcode that matches the documentation: E34.00 (unspecified), E34.01 (syndrome) and E34.09 (syndrome).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2025 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 259.2 (carcinoid syndrome).

Specific codes under E34.0

Coding notes

Code alsoTwo codes may be needed; sequencing depends on circumstances

the underlying disorder, such as:
primary neuroendocrine tumors (C7A.-)
secondary neuroendocrine tumors (C7B.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to E34.0.

› From E34 Other endocrine disorders

Excludes1

pseudohypoparathyroidism (E20.1)

Broader instructions also apply from E20-E35 Disorders of other endocrine glands and Chapter 4: Endocrine, nutritional and metabolic diseases.

ICD-9-CM equivalent

Converter →

259.2Carcinoid syndromeexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
FY2025 (effective 10/1/2024): Expanded — no longer billable

Common questions about E34.0

Is E34.0 billable?: No. E34.0 is a header code. Report one of its more specific subcodes instead.
What is the ICD-9 code for E34.0?: The CMS General Equivalence Mappings map E34.0 to ICD-9-CM 259.2.