E06.1 vs E06.3
E06.1 and E06.3 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on E06.1
autoimmune thyroiditis (E06.3)
E06.1
Subacute thyroiditis
Billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E00-E07
Use when the record says
- de Quervain thyroiditis
- Giant-cell thyroiditis
- Granulomatous thyroiditis
- Nonsuppurative thyroiditis
- Viral thyroiditis
Indexed under
- De Quervain's › thyroiditis
- Quervain's disease › thyroid
- Thyroiditis › de Quervain's
- Thyroiditis › giant-cell
- Thyroiditis › granulomatous
E06.3
Autoimmune thyroiditis
Billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E00-E07
Use when the record says
- Hashimoto's thyroiditis
- Hashitoxicosis (transient)
- Lymphadenoid goiter
- Lymphocytic thyroiditis
- Struma lymphomatosa
Indexed under
- Hashimoto's disease or thyroiditis
- Hashitoxicosis (transient)
- Lymphadenoid goiter
- Autoimmune › thyroiditis
- Disease, diseased › Hashimoto's
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027