A51
⚠ Non-billable
Early syphilis
ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases
Code
A51
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Certain Infectious and Parasitic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code A51?
ICD-10-CM code A51 represents Early syphilis. It is a non-billable header code requiring a more specific subcategory in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is A51 billable?
No. A51 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is A51 in?
A51 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.
Related codes in the A51 category
A51.0
Primary genital syphilis
Billable
A51.1
Primary anal syphilis
Billable
A51.2
Primary syphilis of other sites
Billable
A51.3
Secondary syphilis of skin and mucous membranes
Non-billable
A51.4
Other secondary syphilis
Non-billable
A51.5
Early syphilis, latent
Billable
A51.9
Early syphilis, unspecified
Billable
A51.31
Condyloma latum
Billable
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