A52.01 vs I79.0
A52.01 (Syphilitic aneurysm of aorta) compared with I79.0 (Aneurysm of aorta 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. I79.0 carries an Excludes1 note covering A52.01: “syphilitic aneurysm (A52.01)”
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
| A52.01Syphilitic aneurysm of aorta | I79.0Aneurysm of aorta in diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | I00-I99 — Diseases of the Circulatory System (I00-I99) |
| Definition | Syphilitic aneurysm of aorta is a billable ICD-10-CM diagnosis code (A52.01). | Aneurysm of aorta in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (I79.0). |
| Code first | — | underlying disease |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources