A52.1 vs G99.8
A52.1 (Symptomatic neurosyphilis) compared with G99.8 (Other specified disorders of nervous system 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. G99.8 carries an Excludes1 note covering A52.1: “syphilis (A52.1-)”
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
| A52.1Symptomatic neurosyphilis | G99.8Other specified disorders of nervous system in diseases classified elsewhere | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Symptomatic neurosyphilis is a non-billable ICD-10-CM category code (A52.1). | Other specified disorders of nervous system in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (G99.8). |
| Code first | — | underlying disorder, such as: amyloidosis (E85.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources