A51.5 Early syphilis, latent

Billable ICD-10-CM code, FY2026.

Applicable to

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

MS-DRG index

Defines the logic of DRG(s) 867-869 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 092.0 Early syphilis, latent, serological relapse after treatment (approximate)
• 092.9 Early syphilis, latent, unspecified (approximate)

Code annotations containing back-references to A51.5

Back-references to A51

• Type 2 Excludes: N34 Urethritis and urethral syndrome ("urethritis in diseases with a predominantly sexual mode of transmission (A50-A64)")

Diagnosis Index entries for A51.5

• Syphilis, syphilitic (acquired) › early › latent (without manifestations) (less than 2 years after infection)
• Syphilis, syphilitic (acquired) › early › latent (without manifestations) (less than 2 years after infection) › negative spinal fluid test
• Syphilis, syphilitic (acquired) › early › latent (without manifestations) (less than 2 years after infection) › serological relapse after treatment
• Syphilis, syphilitic (acquired) › early › latent (without manifestations) (less than 2 years after infection) › serology positive
• Syphilis, syphilitic (acquired) › latent › early, or less than 2 years after infection
• Syphilis, syphilitic (acquired) › latent › positive serology (only finding) › early, or less than 2 years after infection

Nearby codes

• 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 (this code)
• A51.9 Early syphilis, unspecified