A27.81 vs G01
A27.81 (Aseptic meningitis in leptospirosis) compared with G01 (Meningitis in bacterial 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. G01 carries an Excludes1 note covering A27.81: “leptospirosis (A27.81)”
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
| A27.81Aseptic meningitis in leptospirosis | G01Meningitis in bacterial diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Aseptic meningitis in leptospirosis is a billable ICD-10-CM diagnosis code (A27.81). | Meningitis in bacterial diseases classified elsewhere is a billable ICD-10-CM diagnosis code (G01). |
| 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