A51.4
⚠ Non-billable (Header)Other secondary syphilis
Certain infectious and parasitic diseases (A00-B99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
Child Codes (7)
Clinical Description
ICD-10-CM code A51.4 represents other secondary syphilis. This code falls under the Certain infectious and parasitic diseases (A00-B99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.
This is a 5-character code at the 4th level of specificity. There are 7 more specific child codes under A51.4.
Frequently Asked Questions
What is ICD-10 code A51.4?
ICD-10-CM code A51.4 is "Other secondary syphilis". It belongs to the category: Certain infectious and parasitic diseases (A00-B99).
Is A51.4 a billable ICD-10 code?
No, A51.4 is a non-billable header code. A more specific child code must be used for billing.
Related Codes in A51
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)