A51.49 Other secondary syphilitic conditions
The ICD-10-CM code for Other secondary syphilitic conditions is A51.49 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- A50-A64: Infections with a predominantly sexual mode of transmission (A50-A64)
- Category A51
- 18 codes (15 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to A51.49:
- Syphilis, syphilitic (acquired) › secondary (and primary)
- Syphilis, syphilitic (acquired) › lymph gland (early) (secondary)
- Syphilis, syphilitic (acquired) › adenopathy (secondary)
- Lymphadenopathy (generalized) › syphilitic (early) (secondary)
- Lymphadenitis › syphilitic (early) (secondary)
- Adenopathy (lymph gland) › syphilitic (secondary)
- Syphilis, syphilitic (acquired) › lymphadenitis (secondary)
- Syphilis, syphilitic (acquired) › secondary (and primary) › adenopathy
Inclusion Terms
- Secondary syphilitic lymphadenopathy
- Secondary syphilitic myositis
U.S. Hospital Utilization
- An estimated 860 U.S. inpatient stays in 2023 included A51.49 among the documented diagnoses.
- 125 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
HIV Infections (TOC entry)a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19
Infectious agents causing diseases in other chapters (TOC)b. Infectious agents as the cause of diseases classified to other chapters ................................. 22
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026