A51: Early syphilis

Codes under A51 (Early syphilis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
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	—
A51.4	Other secondary syphilis	—
A51.5	Early syphilis, latent	✓
A51.9	Early syphilis, unspecified	✓
A51.31	Condyloma latum	✓
A51.32	Syphilitic alopecia	✓
A51.39	Other secondary syphilis of skin	✓
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	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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