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A51.0

Billable

Primary genital syphilis

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

This is the initial stage of syphilis infection that appears as a painless sore or ulcer on the genitals, typically occurring 3-90 days after exposure to the bacteria. It is the first sign of syphilis infection and is highly contagious.

Coding Tips

  • •Ensure the syphilis is documented as primary stage and specifically affecting the genital area to distinguish from secondary or latent syphilis
  • •Verify that serological testing (RPR/VDRL or treponemal tests) results are documented in the medical record to support the diagnosis

Code Hierarchy

└A51Early syphilis└A51.0Primary genital syphilis
└A51.0Primary genital syphilis

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