ICD-10-CM A51: Early syphilis

ICD-10-CM Diagnosis Code (2025)

Official Description for A51

Early syphilis

Coding Notes & Guidelines for A51

Excludes1: Not Coded Here

late syphilitic leukoderma (A52.79)

Inclusion Terms

Syphilitic chancre NOS

Inclusion Terms
  • Syphilitic leukoderma
  • Syphilitic mucous patch
Inclusion Terms
  • Secondary syphilitic chorioretinitis
  • Secondary syphilitic iridocyclitis, iritis
  • Secondary syphilitic uveitis
Inclusion Terms
  • Secondary syphilitic lymphadenopathy
  • Secondary syphilitic myositis
Inclusion Terms

Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after infection.

Child Codes (More Specific Codes for A51):

A51.0 - Primary genital syphilis A51.1 - Primary anal syphilis A51.2 - Primary syphilis of other sites A51.3 - Secondary syphilis of skin and mucous membranes A51.31 - Condyloma latum A51.32 - Syphilitic alopecia A51.39 - Other secondary syphilis of skin A51.4 - Other secondary syphilis A51.41 - Secondary syphilitic meningitis A51.42 - Secondary syphilitic female pelvic disease A51.43 - Secondary syphilitic oculopathy A51.44 - Secondary syphilitic nephritis A51.45 - Secondary syphilitic hepatitis A51.46 - Secondary syphilitic osteopathy A51.49 - Other secondary syphilitic conditions A51.5 - Early syphilis, latent A51.9 - Early syphilis, unspecified

About ICD-10-CM Code A51 (Early syphilis)

ICD-10-CM code A51 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM A51 became effective on October 1, 2024.

This page provides detailed information about A51 - Early syphilis. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Early syphilis.