A18.81 vs E35
A18.81 (Tuberculosis of thyroid gland) compared with E35 (Disorders of endocrine glands in diseases classified elsewhere), 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. E35 carries an Excludes1 note covering A18.81: “tuberculosis of thyroid gland (A18.81)”
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
| A18.81Tuberculosis of thyroid gland | E35Disorders of endocrine glands in diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) |
| Definition | Tuberculosis of thyroid gland is a billable ICD-10-CM diagnosis code (A18.81). | Disorders of endocrine glands in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (E35). |
| Includes | infections due to Mycobacterium tuberculosis and Mycobacterium bovis | — |
| Use additional code | code, if applicable, for associated cachexia (E88.A) | — |
| Code first | — | underlying disease, such as: late congenital syphilis of thymus gland [Dubois disease] (A50.59) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources