Is ICD-10-CM code E31 billable?

No, E31 (Polyglandular dysfunction) 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 E31 belong to?

E31 belongs to Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

E31Not billable, use a more specific code below

Polyglandular dysfunction

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

8 billable codes under E31: none are a CC or MCC; all map to HCC 51 (Addison's and Cushing's Diseases, Acromegaly, and Other Specified Endocrine Disorders).An HCC counts toward a Medicare Advantage patient's risk score.

Instructional notes

Excludes1: not coded here, use a different code

ataxia telangiectasia [Louis-Bar] (G11.3)
dystrophia myotonica [Steinert] (G71.11)
pseudohypoparathyroidism (E20.1)

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

These notes sit on E20-E35 and apply to every code under it, including E31.

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 E31

E31 can't be used on a claim. Pick a billable code below; grey headings group them.

E31 MS-DRGs

As the principal diagnosis, all 8 billable codes under E31 group to MS-DRG 643, 644, or 645 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

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

Endocrine Diseases

Your endocrine system includes eight major glands throughout your body. These glands make hormones. Hormones are chemical messengers. They travel through your bloodstream to tissues or organs. Hormones work slowly and affect body processes from head to toe. These include:

Code history

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