ICD-10 Code A49.3 – Mycoplasma infection, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A49.3 – Mycoplasma infection, unspecified site
What it is
This code identifies a Mycoplasma infection when the site is not specified in the record. Use it for a documented Mycoplasma infection without a clearer anatomic location.
Clinical signs
Clinical features vary; refer to documentation. Mycoplasma infections may present with respiratory or other infectious findings, but you should code only what is specifically documented.
When to use this code
Use A49.3 when the provider documents Mycoplasma infection and does not name a specific site or organ system. It is appropriate when the record confirms the organism but leaves the location unspecified. If the note identifies a more precise site or a different diagnosis, code that instead.
Do not use for
Do not use this code for Mycoplasma pneumonia, bronchitis, or another site-specific infection when documented. Do not assign it if Mycoplasma is only suspected or mentioned without confirmed infection; check documentation.
Coding tip
Code the organism and site exactly as documented, and query for clarification if the record says only “Mycoplasma” without confirming infection.