A53.9
BillableSyphilis, unspecified
A53.9 is the ICD-10-CM code for Syphilis, unspecified. It is a billable, specific code valid for reimbursement.
A00-B99 Certain infectious and parasitic diseases
What this means — in plain language
MedlinePlus · NIHSyphilis is a sexually transmitted infection (STI) caused by bacteria. It infects the genital area, lips, mouth, or anus of both men and women. You usually get syphilis from sexual contact with someone who has it. It can also pass from mother to baby during pregnancy. The early stage of syphilis usually causes a single, small, painless sore. Sometimes it causes swelling in nearby lymph nodes. If you do not treat it,…
Read more about Syphilis at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Includes
- •Infection due to Treponema pallidum NOS
- •Syphilis (acquired) NOS
Excludes1 — not coded here
- •syphilis NOS under two years of age (A50.2)
Medications indicated for this condition
FDA labelingDrugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
- What is ICD-10 code A53.9?
- A53.9 is the ICD-10-CM code for "Syphilis, unspecified". It falls under A00-B99 Certain infectious and parasitic diseases.
- Is A53.9 a billable code?
- Yes — A53.9 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from A53.9?
- Excludes1 (not coded here): syphilis NOS under two years of age (A50.2).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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