A52.79 vs L99
A52.79 (Other symptomatic late syphilis) compared with L99 (Other disorders of skin and subcutaneous tissue 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. L99 carries an Excludes1 note covering A52.79: “skin disorders in syphilis (A51.31, A52.79)”
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
| A52.79Other symptomatic late syphilis | L99Other disorders of skin and subcutaneous tissue in diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) |
| Definition | Other symptomatic late syphilis is a billable ICD-10-CM diagnosis code (A52.79). | Other disorders of skin and subcutaneous tissue in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (L99). |
| Includes | Late syphilitic leukoderma Syphilis of adrenal gland Syphilis of pituitary gland Syphilis of thyroid gland | — |
| Code first | — | underlying disease, 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