E05 vs E06.2
E05 (Thyrotoxicosis [hyperthyroidism]) compared with E06.2 (Chronic thyroiditis with transient thyrotoxicosis), 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. E05 carries an Excludes1 note covering E06.2: “chronic thyroiditis with transient thyrotoxicosis (E06.2)”
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
| E05Thyrotoxicosis [hyperthyroidism] | E06.2Chronic thyroiditis with transient thyrotoxicosis | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) |
| Definition | Thyrotoxicosis [hyperthyroidism] is a non-billable ICD-10-CM category code (E05). | Chronic thyroiditis with transient thyrotoxicosis is a billable ICD-10-CM diagnosis code (E06.2). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources