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E06.3 — Autoimmune thyroiditis
E06.3
What this code means
Autoimmune thyroiditis (Hashimoto's) is immune attack on the thyroid, gradually making it underactive.
Also called: hashimotos thyroiditis, autoimmune thyroiditis.
When this code is used
Used for autoimmune (Hashimoto) thyroiditis.
Where it sits in ICD-10-CM
Code E06.3 belongs to Chapter 4: Endocrine, nutritional and metabolic diseases, which covers codes E00–E89 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Related anatomy
Frequently asked questions
What is ICD-10-CM code E06.3?
E06.3 is the ICD-10-CM diagnosis code for “Autoimmune thyroiditis”. Autoimmune thyroiditis (Hashimoto's) is immune attack on the thyroid, gradually making it underactive.
When is code E06.3 used?
Used for autoimmune (Hashimoto) thyroiditis. It belongs to Chapter 4 of ICD-10-CM (Endocrine, nutritional and metabolic diseases).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.