ICD-10-CM 2027
ICD-10 code for thyroid atrophy
From the official ICD-10-CM alphabetic index entry “Atrophy, atrophic (of) › thyroid (gland) (acquired)”. Page updated September 29, 2026.
About coding thyroid atrophy
The ICD-10-CM code for thyroid atrophy is E03.4 (Atrophy of thyroid (acquired)). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on E03.4.
Within E03 (other hypothyroidism), E03.4 is specifically for atrophy of thyroid (acquired). Related codes cover congenital hypothyroidism with diffuse goiter (E03.0), congenital hypothyroidism without goiter (E03.1), hypothyroidism due to medicaments and other exogenous substances (E03.2), postinfectious hypothyroidism (E03.3), myxedema coma (E03.5), other specified hypothyroidism (E03.8) and hypothyroidism, unspecified (E03.9).
Don't report E03.4 together with the conditions in its Excludes1 note: congenital atrophy of thyroid (E03.1).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific thyroid atrophy codes (official index)
Don't confuse with (Excludes1 for E03.4)
- congenital atrophy of thyroid (E03.1)
Common questions about thyroid atrophy ICD-10 codes
What is the ICD-10 code for thyroid atrophy?
- E03.4 — Atrophy of thyroid (acquired). More specific codes apply when the documentation supports them: E03.1, E03.1.
What is the ICD-10 code for congenital thyroid atrophy?
- E03.1 — Congenital hypothyroidism without goiter.
Is E03.4 billable?
- Yes. E03.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E03.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E03.4 as a principal diagnosis.
Is E03.4 a CC or MCC?
- No. E03.4 is neither a CC nor an MCC under MS-DRG v44.0.