A53.9 Syphilis, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Infection due to Treponema pallidum NOS
• Syphilis (acquired) NOS

Excludes1 (never code together)

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

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 097.9 Syphilis, unspecified

Code annotations containing back-references to A53.9

Back-references to A53

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

Diagnosis Index entries for A53.9

• Positive › VDRL › with signs or symptoms - code by site and stage under Syphilis
• Syphilis, syphilitic (acquired)
• Syphilis, syphilitic (acquired) › conjugal
• Syphilis, syphilitic (acquired) › due to blood transfusion
• Syphilis, syphilitic (acquired) › general
• Syphilis, syphilitic (acquired) › organic

Nearby codes

• A53 Other and unspecified syphilis
• A53.0 Latent syphilis, unspecified as early or late
• A53.9 Syphilis, unspecified (this code)