A39.1 vs E35
A39.1 (Waterhouse-Friderichsen syndrome) 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 A39.1: “meningococcal hemorrhagic adrenalitis (A39.1)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. E35 carries an Excludes1 note covering A39.1: “Waterhouse-Friderichsen syndrome (A39.1)”
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
| A39.1Waterhouse-Friderichsen syndrome | 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 | Waterhouse-Friderichsen syndrome is a billable ICD-10-CM diagnosis code (A39.1). | Disorders of endocrine glands in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (E35). |
| Includes | Meningococcal hemorrhagic adrenalitis Meningococcic adrenal syndrome | — |
| 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