A51 — Early syphilis
Is A51 billable?
No — A51 is a non-billable header code. A51 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 15 billable codes beneath A51.
Billable codes under this header
- A51.0Primary genital syphilis
- A51.1Primary anal syphilis
- A51.2Primary syphilis of other sites
- A51.5Early syphilis, latent
- A51.9Early syphilis, unspecified
- A51.31Condyloma latum
- A51.32Syphilitic alopecia
- A51.39Other secondary syphilis of skin
- A51.41Secondary syphilitic meningitis
- A51.42Secondary syphilitic female pelvic disease
- A51.43Secondary syphilitic oculopathy
- A51.44Secondary syphilitic nephritis
- A51.45Secondary syphilitic hepatitis
- A51.46Secondary syphilitic osteopathy
- A51.49Other secondary syphilitic conditions
A51 at a glance
| Code | A51 |
|---|---|
| Description | Early syphilis |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together — inherited from A50-A64
The conditions below can never be reported together with A51 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 1
Report an additional code alongside A51 to fully describe the condition. A51 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of A51, but a patient may have both at the same time. When documentation supports it, A51 and the excluded code may both be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Excludes2 — not included here — inherited from A50-A64
The conditions below are not part of A51, but a patient may have both at the same time. When documentation supports it, A51 and the excluded code may both be reported.
- human immunodeficiency virus [HIV] disease (B20)
What codes fall under A51? (7)
How long has A51 existed?
A51 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.