Is ICD-10-CM code E23 billable?

No, E23 (Hypofunction and other disorders of the pituitary gland) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code E23 belong to?

E23 belongs to Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

E23Not billable, use a more specific code below

Hypofunction and other disorders of the pituitary gland

In Disorders of other endocrine glands (E20-E35), chapter 4: Endocrine, Nutritional and Metabolic Diseases

6 billable codes under E23: 2 are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

Instructional notes

Includes: conditions that are coded here

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

Excludes1: not coded here, use a different code

postprocedural hypopituitarism (E89.3)
short stature due to endocrine disorder (E34.3-)

Also applies, from Disorders of other endocrine glands (E20-E35)

These notes sit on E20-E35 and apply to every code under it, including E23.

Excludes1: not coded here, use a different code

galactorrhea (N64.3)
gynecomastia (N62)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers diabetes mellitus coding, including type, insulin and drug use, pump malfunction and secondary diabetes, plus obesity and obesity class codes.

Diabetes mellitus (page 39)
Obesity (page 42)

Read Section I.C.4 (page 39)

All codes under E23

E23 can't be used on a claim. Pick a billable code below; grey headings group them.

E23 MS-DRGs

As the principal diagnosis, the billable codes under E23 group to MS-DRG 643, 644, 645, 791, or 793 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

DRG 643 Endocrine Disorders with MCC (6 of 6 codes)
DRG 644 Endocrine Disorders with CC (6 of 6 codes)
DRG 645 Endocrine Disorders without CC/MCC (6 of 6 codes)
DRG 791 Prematurity with Major Problems (1 of 6 codes)
DRG 793 Full Term Neonate with Major Problems (1 of 6 codes)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.