Disorders of other endocrine glands (E20-E35) ICD-10-CM
The E20–E35 section covers disorders of other endocrine glands with 125 ICD-10-CM diagnosis codes, of which 99 are billable in fiscal year 2026. The section is organized into the 15 code ranges listed below.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Code Ranges in This Section 15 ranges · 125 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the E20–E35 Code Range
Codes E20-E35 cover various disorders affecting endocrine glands beyond the thyroid and pancreas, including diseases of the parathyroid, pituitary, adrenal glands, ovaries, and testes. These codes are essential for identifying specific conditions such as hypoparathyroidism (E20), hyperparathyroidism (E21), pituitary gland dysfunctions (E22-E23), Cushing's syndrome (E24), adrenogenital disorders (E25), and polyglandular syndromes (E31).
The ICD-10-CM range E20-E35 also includes detailed subcodes for precise diagnoses, facilitating accurate tracking of conditions like idiopathic hypoparathyroidism (E20.0), pituitary-dependent Cushing’s disease (E24.0), and polycystic ovarian syndrome (E28.2). Common synonyms such as Conn's syndrome for E26.01 and ACTH-dependent Cushing's syndrome for E24.0 help coders link clinical terminology to the correct codes. Additionally, distinctions between primary, secondary, and unspecified forms—seen in codes like E20.81 (hypoparathyroidism due to impaired hormone secretion) and E21.1 (secondary hyperparathyroidism)—are clearly outlined. These codes also address dysfunctions in sexual development and puberty disorders, for example, delayed puberty (E30.0) and precocious puberty (E30.1). Overall, the E20-E35 range targets specialized endocrine gland disorders, supporting nuanced coding for endocrine diagnostics and management.
Questions About This Page
How many codes are in the E20-E35 range?
The E20-E35 range contains 125 ICD-10-CM diagnosis codes in FY 2026. 99 of them are billable, and the rest are category headers that organize the section.
What conditions does E20-E35 cover?
The range covers disorders of other endocrine glands. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
