ICD-10 Code B96.0 – Mycoplasma pneumoniae [M. pneumoniae] as the cause of diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B96.0 – Mycoplasma pneumoniae [M. pneumoniae] as the cause of diseases classified elsewhere
What it is
This code identifies Mycoplasma pneumoniae as the infectious cause of another condition, not as the primary diagnosis. Use it when documentation links the organism to a separate disease such as pneumonia or bronchitis.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include respiratory symptoms consistent with atypical infection, such as cough, fever, and malaise, with supportive testing or provider attribution to Mycoplasma pneumoniae.
When to use this code
Use B96.0 when the record states Mycoplasma pneumoniae is the cause of a disease classified elsewhere, and you are also coding the underlying condition. It is often paired with a respiratory diagnosis when the provider identifies this organism as the cause.
Do not use it as the principal diagnosis. Confirm that the chart clearly supports organism-to-condition linkage; if the documentation is unclear, check documentation.
Do not use for
Do not use this code for uncomplicated Mycoplasma infection without a linked secondary diagnosis. Also avoid it when the organism is mentioned only as a test result or suspected cause without provider confirmation.
Coding tip
Always code the underlying condition first, then add B96.0 only when the provider documents Mycoplasma pneumoniae as the causal organism.