ICD-10 Code A49.1 – Streptococcal infection, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A49.1 – Streptococcal infection, unspecified site
What it is
A49.1 identifies a streptococcal infection when the organism is known or suspected, but the site is not specified in the documentation. Use it for an unspecified streptococcal bacterial infection, not for a localized diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Typical streptococcal infection findings may include signs of acute infection such as fever, localized inflammation, pain, or purulent drainage, depending on the affected area.
When to use this code
Use A49.1 when the provider documents streptococcal infection without naming the anatomic site, or when the record supports streptococcal infection but the location remains unclear. It is appropriate when no more specific code is available from the note. If the site is documented, choose the site-specific code instead.
Do not use for
Do not use this code for streptococcal diseases with a defined site, such as pharyngitis, pneumonia, or skin infection. Also avoid it when documentation only states colonization, carrier status, or a different organism. Check documentation.
Coding tip
Query for the infection site before selecting A49.1, because a more specific code is usually preferred.