Is ICD-10-CM code E03 billable?

No, E03 (Other hypothyroidism) 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 E03 belong to?

E03 belongs to Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

E03Not billable, use a more specific code below

Other hypothyroidism

In Disorders of thyroid gland (E00-E07), chapter 4: Endocrine, Nutritional and Metabolic Diseases

8 billable codes under E03: 1 is an MCC; 1 map to HCC 202 (Coma, Brain Compression/Anoxic Damage).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

Instructional notes

Excludes1: not coded here, use a different code

iodine-deficiency related hypothyroidism (E00-E02)
postprocedural hypothyroidism (E89.0)

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 E03

E03 can't be used on a claim. Pick a billable code below; grey headings group them.

E03 MS-DRGs

As the principal diagnosis, the billable codes under E03 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 (6 of 8 codes)
DRG 644 Endocrine Disorders with CC (6 of 8 codes)
DRG 645 Endocrine Disorders without CC/MCC (6 of 8 codes)
DRG 080 Nontraumatic Stupor and Coma with MCC (1 of 8 codes)
DRG 081 Nontraumatic Stupor and Coma without MCC (1 of 8 codes)
DRG 791 Prematurity with Major Problems (1 of 8 codes)
DRG 793 Full Term Neonate with Major Problems (1 of 8 codes)

Other codes that refer to E03

Notes on these codes point to E03.

F02 Code First: hypothyroidism, acquired (E00-E03.-)
G13.2 Code First: hypothyroidism (E03.-)
H28 Code First: myxedema (E03.-)
I27.29 Code Also: hypothyroidism (E00-E03)
M14.8 Code First: hypothyroidism (E00-E03)

About the condition

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

Hypothyroidism

Hypothyroidism, or underactive thyroid, happens when your thyroid gland doesn't make enough thyroid hormones to meet your body's needs. Your thyroid is a small, butterfly-shaped gland in the front of your neck. It makes hormones that control the way the body uses energy. These hormones affect nearly every organ in your body and control many of your body's most important functions. For example, they affect your breathing, heart rate, weight, digestion, and moods. Without enough thyroid hormones, many of your body's functions slow down. But there are treatments that can help.

Code history

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