Excludes1 pair
E06.2 vs E06.3
E06.2 and E06.3 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
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
- 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 (struma lymphomatosa)
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