A90 vs A91
A90 (Dengue fever [classical dengue]) compared with A91 (Dengue hemorrhagic fever), 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. A90 carries an Excludes1 note covering A91: “dengue hemorrhagic fever (A91)”
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
| A90Dengue fever [classical dengue] | A91Dengue hemorrhagic fever | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) |
| Definition | Dengue fever [classical dengue] is a billable ICD-10-CM diagnosis code (A90). | Dengue hemorrhagic fever is a billable ICD-10-CM diagnosis code (A91). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources