What is the ICD-10-CM code for hypothyroidism?

The primary ICD-10-CM code for hypothyroidism is E03.9 (Hypothyroidism, unspecified). There are 10 billable hypothyroidism codes in FY2027, covering different types and underlying causes.

How many ICD-10-CM codes are there for hypothyroidism?

There are 11 ICD-10-CM codes for hypothyroidism in the FY2027 tabular list, of which 10 are billable. These codes fall under Chapter 4 of the ICD-10-CM classification.

Which chapter covers hypothyroidism in ICD-10-CM?

Hypothyroidism codes are classified in Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

Hypothyroidism ICD-10-CM codes

ICD-10-CM codes for hypothyroidism, including congenital hypothyroidism, postprocedural hypothyroidism, and myxedema coma.

11 codes, 10 billable. FY2027, valid from October 1, 2026. In chapter 4: Endocrine, Nutritional and Metabolic Diseases.

How to code Hypothyroidism

E03.9 (hypothyroidism, unspecified) is the default code for acquired hypothyroidism when neither the cause nor a more specific type is documented.

Use E03.1 for congenital hypothyroidism, E89.0 for postprocedural hypothyroidism following thyroid surgery or ablation (with the procedure history captured by Z90.- codes where applicable), and E03.5 for myxedema coma, which is a medical emergency requiring separate coding of any associated conditions.

Subclinical hypothyroidism and iodine-deficiency related presentations have their own E00-E02 categories; do not default them to E03.9 when specifically documented.

All Hypothyroidism codes

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