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A53.9

Billable

Syphilis, unspecified

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

What This Code Means

This code is used when a patient has syphilis (a sexually transmitted bacterial infection) but the specific stage or type has not been determined or documented. Syphilis can affect multiple body systems and requires treatment with antibiotics.

Coding Tips

  • •Use this code only when the documentation does not specify the stage of syphilis (primary, secondary, latent, or tertiary); query the provider for more specific information when possible to assign a more precise code
  • •Ensure proper documentation of serological test results and clinical findings, as more specific syphilis codes (A50-A53.8) provide better clinical detail and may affect treatment decisions

Excludes 1 — Do NOT code together

  • syphilis NOS under two years of age (A50.2)

Code Hierarchy

└A53Other and unspecified syphilis└A53.9Syphilis, unspecified
└A53.9Syphilis, unspecified

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