ICD-10-CM 2027
ICD-10 code for lip syphilis
From the official ICD-10-CM alphabetic index entry “Syphilis, syphilitic (acquired) › lip”. Page updated September 29, 2026.
About coding lip syphilis
The ICD-10-CM code for lip syphilis is A51.39 (Other secondary syphilis of skin). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A51.39.
Within A51.3, choose A51.39 (Other secondary syphilis of skin) only when documentation doesn't support a more specific option: Condyloma latum (A51.31) and syphilitic alopecia (A51.32).
Don't report A51.39 together with the conditions in its Excludes1 note: late syphilitic leukoderma (A52.79).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific lip syphilis codes (official index)
Don't confuse with (Excludes1 for A51.39)
- late syphilitic leukoderma (A52.79)
Common questions about lip syphilis ICD-10 codes
What is the ICD-10 code for lip syphilis?
- A51.39 — Other secondary syphilis of skin. More specific codes apply when the documentation supports them: A51.2, A52.79.
What is the ICD-10 code for chancre lip syphilis?
- A51.2 — Primary syphilis of other sites.
What is the ICD-10 code for late lip syphilis?
- A52.79 — Other symptomatic late syphilis.
Is A51.39 billable?
- Yes. A51.39 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A51.39 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A51.39 as a principal diagnosis.
Is A51.39 a CC or MCC?
- A51.39 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.