ICD-10 Code for Hypothyroidism
Also indexed as (acquired)
The ICD-10-CM code for hypothyroidism is E03.9 — Hypothyroidism, unspecified. This is the code the Alphabetic Index gives for hypothyroidism with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
E03.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which hypothyroidism code should you use?
The Alphabetic Index lists 10 codes under Hypothyroidism. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| congenital | E03.1 | Congenital hypothyroidism without goiter | |
| iatrogenic NEC | E03.2 | Hypothyroidism due to medicaments and other exogenous substances | |
| iodine-deficiency | E01.8 | Other iodine-deficiency related thyroid disorders and allied conditions | |
| neonatal, transitory | P72.2 | Other transitory neonatal disorders of thyroid function, not elsewhere classified | |
| postinfectious | E03.3 | Postinfectious hypothyroidism | |
| postirradiation | E89.0 | Postprocedural hypothyroidism | |
| postprocedural | E89.0 | Postprocedural hypothyroidism | |
| postsurgical | E89.0 | Postprocedural hypothyroidism | |
| specified NEC | E03.8 | Other specified hypothyroidism | |
| subclinical, iodine-deficiency related | E02 | Subclinical iodine-deficiency hypothyroidism |
Hypothyroidism congenital
| with goiter | E03.0 | Congenital hypothyroidism with diffuse goiter |
Hypothyroidism due to
| exogenous substance NEC | E03.2 | Hypothyroidism due to medicaments and other exogenous substances | |
| iodine-deficiency, acquired | E01.8 | Other iodine-deficiency related thyroid disorders and allied conditions | |
| irradiation therapy | E89.0 | Postprocedural hypothyroidism | |
| medicament NEC | E03.2 | Hypothyroidism due to medicaments and other exogenous substances | |
| P-aminosalicylic acid | E03.2 | Hypothyroidism due to medicaments and other exogenous substances | |
| phenylbutazone | E03.2 | Hypothyroidism due to medicaments and other exogenous substances | |
| resorcinol | E03.2 | Hypothyroidism due to medicaments and other exogenous substances | |
| sulfonamide | E03.2 | Hypothyroidism due to medicaments and other exogenous substances | |
| surgery | E89.0 | Postprocedural hypothyroidism | |
| thiourea group drugs | E03.2 | Hypothyroidism due to medicaments and other exogenous substances | |
| iodine-deficiency, acquired › subclinical | E02 | Subclinical iodine-deficiency hypothyroidism |
Hypothyroidism iodine-deficiency
| subclinical | E02 | Subclinical iodine-deficiency hypothyroidism |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources