A51 ICD-10-CM Code: Early syphilis
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
A51Early syphilis
ICD-10-CM diagnosis code · United States clinical modification
Where A51 sits
- 1
Chapter 1
Certain infectious and parasitic diseases (A00-B99)
- 2
Section
Infections with a predominantly sexual mode of transmission (A50-A64)
- 3
Category A51
Early syphilis
- 4
Code A51
Early syphilis
Codes under A51
A51 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for A51.
Code first
No “code first” instruction is listed for A51.
Use additional code
No “use additional code” instruction is listed for A51.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for A51.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for A51.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code A51 mean?
A51 is the FY 2027 U.S. ICD-10-CM code for “Early syphilis.”
Is A51 a billable or specific ICD-10-CM code?
No. A51 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is A51 located in ICD-10-CM?
A51 is listed in Chapter 1, Certain infectious and parasitic diseases (A00-B99), within Infections with a predominantly sexual mode of transmission (A50-A64) (A50–A64), under category A51, Early syphilis.
What coding notes are listed for A51?
No inclusion terms are listed for A51 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.