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E00 vs E03

E00 (Congenital iodine-deficiency syndrome) compared with E03 (Other hypothyroidism), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. E03 carries an Excludes1 note covering E00: “iodine-deficiency related hypothyroidism (E00-E02)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

E00Congenital iodine-deficiency syndromeE03Other hypothyroidism
Billing statusNon-billable header

Report instead: E00.0, E00.1, E00.2, E00.9

Non-billable header

Report instead: E03.0, E03.1, E03.2, E03.3, E03.4

ClassificationE00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89)E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89)
DefinitionCongenital iodine-deficiency syndrome is a non-billable ICD-10-CM category code (E00).Other hypothyroidism is a non-billable ICD-10-CM category code (E03).
Use additional code
code (F70-F79) to identify associated intellectual disabilities.
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources