2027 ICD-10-CM Diagnosis Code E23Hypofunction and other disorders of the pituitary gland

ICD-10-CM Codes›E00–E89›E20-E35›E23

ICD-10-CM E23
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

E23 is a non-billable ICD-10-CM category code for hypofunction and other disorders of the pituitary gland, so it cannot be submitted on claims. Use a more specific code from this category instead, such as E23.0, E23.1, E23.2, and E23.3.

Code Identity

ICD-10-CM Code
E23
Billable Status
No — Non-Billable Category
Code Describes
Hypofunction and other disorders of the pituitary gland
Short Description
Hypofunction and other disorders of the pituitary gland
Same as the full description in the CMS dataset.
Chapter
E20-E35
Disorders of other endocrine glands

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE20-E35Disorders of other endocrine glands
CategoryE23Hypofunction and other disorders of the pituitary gland
This CodeE23Hypofunction and other disorders of the pituitary gland

Specific Coding for Hypofunction and other disorders of the pituitary glandOverview

Non-specific codes like E23 require more characters. Use one of these billable codes instead:

  • Use E23.0 for Hypopituitarism

  • Use E23.1 for Drug-induced hypopituitarism

  • Use E23.2 for Diabetes insipidus

  • Use E23.3 for Hypothalamic dysfunction, not elsewhere classified

  • Use E23.6 for Other disorders of pituitary gland

  • Use E23.7 for Disorder of pituitary gland, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to E23: its own notes plus those printed at block E20-E35 and Chapter 4. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • the listed conditions whether the disorder is in the pituitary or the hypothalamus

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On E23 itself
  • postprocedural hypopituitarism (E89.3)
  • short stature due to endocrine disorder (E34.3-)
From Block E20-E35 Disorders of other endocrine glands applies to 99 codes
From Chapter 4 (E00-E89) Endocrine, nutritional and metabolic diseases applies to 973 codes
  • transitory endocrine and metabolic disorders specific to newborn (P70-P74)

Notes

General instructions on how these codes are used.

From Chapter 4 (E00-E89) Endocrine, nutritional and metabolic diseases applies to 973 codes
  • All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name E23, its category, or a range that includes it.

Code First 1

These codes say to code first a condition named in the note, and E23 is one of the conditions named.

  • G63 Polyneuropathy in diseases classified elsewhere
    endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34) names E20-E34, which includes this code

Notes 1

These notes mention E23.

  • Chapter 4 (E00-E89) Endocrine, nutritional and metabolic diseases
    All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere. names E16-E31, which includes this code

Patient EducationClinical

Pituitary Disorders

Your pituitary gland is a pea-sized gland at the base of your brain. The pituitary is the "master control gland" - it makes hormones that affect growth and the functions of other glands in the body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About E23Overview

What is the ICD-10 code for hypofunction and other disorders of the pituitary gland?

E23 is the ICD-10-CM category for hypofunction and other disorders of the pituitary gland, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is E23 (Hypofunction and other disorders of the pituitary gland) a billable code?

No. This is a category header that groups the codes for hypofunction and other disorders of the pituitary gland, and headers cannot be submitted on claims. Claims for hypofunction and other disorders of the pituitary gland need a more specific code from this category, such as E23.0, E23.1, and E23.2.

Can E23 be reported with E89.3?

Not as a rule. The Excludes1 note on E23 lists "postprocedural hypopituitarism (E89.3)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).