A51.46 Secondary syphilitic osteopathy

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

MS-DRG index

Defines the logic of DRG(s) 539-541 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 091.61 Secondary syphilitic periostitis (approximate)

Code annotations containing back-references to A51.46

Back-references to A51.46

• Type 1 Excludes: M90 Osteopathies in diseases classified elsewhere ("secondary syphilis (A51.46)")

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 A51.46

• Periostitis (albuminosa) (circumscribed) (diffuse) (infective) (monomelic) › syphilitic › secondary
• Syphilis, syphilitic (acquired) › bone › secondary
• Syphilis, syphilitic (acquired) › periosteum (late) › early (secondary)
• Syphilis, syphilitic (acquired) › secondary (and primary) › bone
• Syphilis, syphilitic (acquired) › secondary (and primary) › periosteum, periostitis

Nearby codes

• 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 (this code)
• A51.49 Other secondary syphilitic conditions
• A51.5 Early syphilis, latent
• A51.9 Early syphilis, unspecified