ICD-10-CM 2027
ICD-10 code for Chancre
From the official ICD-10-CM alphabetic index entry “Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic)”. Page updated September 29, 2026.
About coding Chancre
The ICD-10-CM code for Chancre is A51.0 (Primary genital syphilis). The official index lists 20 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A51.0.
Within A51 (early syphilis), A51.0 is specifically for primary genital syphilis. Related codes cover primary anal syphilis (A51.1), primary syphilis of other sites (A51.2), 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 727 (Inflammation of the Male Reproductive System with MCC, relative weight 1.37), DRG 728 (Inflammation of the Male Reproductive System without MCC, relative weight 0.8224), DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC, relative weight 1.8456), DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC, relative weight 1.2974), DRG 757 (Infections, Female Reproductive System with MCC, relative weight 1.4649), DRG 758 (Infections, Female Reproductive System with CC, relative weight 0.9908) and 1 more, in MDC 12 (Diseases and Disorders of the Male Reproductive System) and MDC 13 (Diseases and Disorders of the Female Reproductive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Chancre codes (official index)
- congenital A50.07 — Early mucocutaneous congenital syphilis
- conjunctiva NEC A51.2 — Primary syphilis of other sites
- ducreyi A57 — Chancroid
- Ducrey's A57 — Chancroid
- extragenital A51.2 — Primary syphilis of other sites
- eyelid A51.2 — Primary syphilis of other sites
- lip A51.2 — Primary syphilis of other sites
- nipple A51.2 — Primary syphilis of other sites
- Nisbet's A57 — Chancroid
- of
- carate A67.0 — Primary lesions of pinta
- pinta A67.0 — Primary lesions of pinta
- yaws A66.0 — Initial lesions of yaws
- palate, soft A51.2 — Primary syphilis of other sites
- phagedenic A57 — Chancroid
- simple A57 — Chancroid
- soft A57 — Chancroid
- bubo A57 — Chancroid
- palate A51.2 — Primary syphilis of other sites
- urethra A51.0 — Primary genital syphilis
- yaws A66.0 — Initial lesions of yaws
Common questions about Chancre ICD-10 codes
What is the ICD-10 code for Chancre?
- A51.0 — Primary genital syphilis. More specific codes apply when the documentation supports them: A50.07, A51.2, A57, A57 and others below.
What is the ICD-10 code for congenital chancre?
- A50.07 — Early mucocutaneous congenital syphilis.
What is the ICD-10 code for conjunctiva nec chancre?
- A51.2 — Primary syphilis of other sites.
What is the ICD-10 code for ducreyi chancre?
- A57 — Chancroid.
What is the ICD-10 code for ducrey's chancre?
- A57 — Chancroid.
What is the ICD-10 code for extragenital chancre?
- A51.2 — Primary syphilis of other sites.
What is the ICD-10 code for eyelid chancre?
- A51.2 — Primary syphilis of other sites.
Is A51.0 billable?
- Yes. A51.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A51.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A51.0 as a principal diagnosis.
Is A51.0 a CC or MCC?
- No. A51.0 is neither a CC nor an MCC under MS-DRG v44.0.