ICD-10-CM 2027
ICD-10 code for lip chancre
From the official ICD-10-CM alphabetic index entry “Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic) › lip”. Page updated September 29, 2026.
About coding lip chancre
The ICD-10-CM code for lip chancre is A51.2 (Primary syphilis of other sites).
Within A51, choose A51.2 (Primary syphilis of other sites) only when documentation doesn't support a more specific option: primary genital syphilis (A51.0), primary anal syphilis (A51.1), secondary syphilis of skin and mucous membranes (A51.3), other secondary syphilis (A51.4), latent (A51.5) and unspecified (A51.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about lip chancre ICD-10 codes
What is the ICD-10 code for lip chancre?
- A51.2 — Primary syphilis of other sites.
Is A51.2 billable?
- Yes. A51.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A51.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A51.2 as a principal diagnosis.
Is A51.2 a CC or MCC?
- No. A51.2 is neither a CC nor an MCC under MS-DRG v44.0.