E06.2 vs E06.3
E06.2 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 E06.2
autoimmune thyroiditis (E06.3)
E06.2
Chronic thyroiditis with transient thyrotoxicosis
Billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E00-E07
Indexed under
- Thyrotoxicosis › transient with chronic thyroiditis (recurrent)
- Thyroiditis › chronic › with thyrotoxicosis, transient
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