ICD-10-CM
ICD-10 code for Hypothyroidism: E03.9
The ICD-10-CM index points "Hypothyroidism" to E03 (Other hypothyroidism), a header that is not billable. When nothing more specific is documented, the billable code is E03.9, Hypothyroidism, unspecified.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- E03.1congenital (without goiter), Congenital hypothyroidism without goiterBillable
- E03.2iatrogenic NEC, Hypothyroidism due to medicaments and other exogenous substancesBillable
- E01.8iodine-deficiency (acquired), Other iodine-deficiency related thyroid disorders and allied conditionsBillable
- P72.2neonatal, transitory, Other transitory neonatal disorders of thyroid function, not elsewhere classifiedBillable
- E03.3postinfectious, Postinfectious hypothyroidismBillable
- E89.0postirradiation, Postprocedural hypothyroidismBillable
- E89.0postprocedural, Postprocedural hypothyroidismBillable
- E89.0postsurgical, Postprocedural hypothyroidismBillable
- E03.8specified NEC, Other specified hypothyroidismBillable
- E02subclinical, iodine-deficiency related, Subclinical iodine-deficiency hypothyroidismBillable
More specific codes in E03
A header groups codes and is not billed. A billable code is one you can report.
- E03Other hypothyroidismHeader
- E03.0Congenital hypothyroidism with diffuse goiterBillable
- E03.1Congenital hypothyroidism without goiterBillable
- E03.2Hypothyroidism due to medicaments and other exogenous substancesBillable
- E03.3Postinfectious hypothyroidismBillable
- E03.4Atrophy of thyroid (acquired)Billable
- E03.5Myxedema comaBillable
- E03.8Other specified hypothyroidismBillable
- E03.9Hypothyroidism, unspecifiedBillable
Excludes1
Excludes1 means these codes are not reported together.
From E03. A note on a category applies to every code under it.
Related conditions
Related pages
- E03.9 code detailsNotes, nearby codes, CMS-HCC group
- Category E03Every code under it
- Chapter 4Endocrine, nutritional and metabolic diseases
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Hypothyroidism?
The ICD-10-CM index points "Hypothyroidism" to E03 (Other hypothyroidism), a header that is not billable. When nothing more specific is documented, the billable code is E03.9, Hypothyroidism, unspecified.
Is E03.9 billable?
Yes. E03.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to E03.9?
The CDC tabular list gives 2 Excludes1 notes (not coded together) for E03.9 and the categories above it. They are listed on this page.
What chapter is E03.9 in?
Chapter 4. Endocrine, nutritional and metabolic diseases.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.