ICD-10 Code A53.0 – Latent syphilis, unspecified as early or late (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A53.0 – Latent syphilis, unspecified as early or late
What it is
A53.0 identifies latent syphilis when the infection is present but there are no current signs or symptoms. The stage is not specified as early or late, so you should rely on the provider’s documentation.
Clinical signs
Clinical features vary; refer to documentation. Latent syphilis is typically found by serologic testing rather than symptoms, and the patient may have no visible lesions or complaints.
When to use this code
Use A53.0 when the record states latent syphilis and does not specify whether it is early or late. This code fits asymptomatic patients with confirmed infection after prior evaluation. If staging is unclear, document review is essential.
Do not use for
Do not use this code for primary, secondary, or tertiary syphilis, or when the provider clearly documents early or late latent syphilis. Check documentation if the stage is specified elsewhere.
Coding tip
Code only after confirming latent status and unspecified stage in the chart.