A51.0
Primary genital syphilis
Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 8 never code together
A50-A64block
A00-B99chapter
Excludes1
- certain localized infections - see body system-related chapters
Excludes2
- carrier or suspected carrier of infectious disease (Z22.-)Z22.-
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)O98.-
- infectious and parasitic diseases specific to the perinatal period (P35-P39)P35-P39
- influenza and other acute respiratory infections (J00-J22)J00-J22
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 3
Index entries leading here 7
- Bubo I88.8
- syphilitic (primary) A51.0
- Syphilis, syphilitic (acquired) A53.9
- Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic) A51.0
- urethra A51.0
- Ulcus — see also Ulcer
- durum (syphilitic) A51.0
- Lesion (s) (nontraumatic)
- primary A51.0
- Vaginitis (acute) (circumscribed) (diffuse) (emphysematous) (nonvenereal) (ulcerative) N76.0
- syphilitic (early) A51.0
- Vulvitis (acute) (allergic) (atrophic) (hypertrophic) (intertriginous) (senile) N76.2
- syphilitic (early) A51.0
Alongside this code 6 same parent — A51
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.