Is ICD-10-CM code E20 billable?

No, E20 (Hypoparathyroidism) 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 E20 belong to?

E20 belongs to Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

E20Not billable, use a more specific code below

Hypoparathyroidism

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

9 billable codes under E20: none are a CC or MCC; none map to an HCC.

Instructional notes

Excludes1: not coded here, use a different code

Di George's syndrome (D82.1)
postprocedural hypoparathyroidism (E89.2)
tetany NOS (R29.0)
transitory neonatal hypoparathyroidism (P71.4)

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

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

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 E20

E20 can't be used on a claim. Pick a billable code below; grey headings group them.

E20 MS-DRGs

As the principal diagnosis, the billable codes under E20 group to these 7 MS-DRGs (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 (8 of 9 codes)
DRG 644 Endocrine Disorders with CC (8 of 9 codes)
DRG 645 Endocrine Disorders without CC/MCC (8 of 9 codes)
DRG 791 Prematurity with Major Problems (8 of 9 codes)
DRG 793 Full Term Neonate with Major Problems (8 of 9 codes)
DRG 640 Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC (1 of 9 codes)
DRG 641 Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC (1 of 9 codes)

Other codes that refer to E20

Notes on these codes point to E20.

E83 Excludes1: parathyroid disorders (E20-E21)
G63 Code First: endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)
G73.7 Code First: hypoparathyroidism (E20.-)
H28 Code First: hypoparathyroidism (E20.-)

About the condition

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

Parathyroid Disorders

Most people have four pea-sized glands, called parathyroid glands, on the thyroid gland in the neck. Though their names are similar, the thyroid and parathyroid glands are completely different. The parathyroid glands make parathyroid hormone (PTH), which helps your body keep the right balance of calcium and phosphorous.

Code history

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