ICD-10 Code J17 – Pneumonia in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J17 – Pneumonia in diseases classified elsewhere
What it is
J17 identifies pneumonia that is caused by, or occurs with, another disease classified elsewhere in ICD-10. You use it when the underlying condition is known and the pneumonia is documented as secondary to it.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include cough, fever, shortness of breath, chest discomfort, and imaging evidence of pneumonia, with the linked underlying disease noted in the record.
When to use this code
Use J17 when the provider states that pneumonia is due to another classified condition and does not assign a more specific pneumonia code. This code supports cases where the causal disease is documented elsewhere in the chart. Code the underlying condition first when required by ICD-10-CM sequencing rules.
Do not use for
Do not use J17 for pneumonia with no documented underlying cause or when a more specific organism-based pneumonia code applies. Check documentation if the record does not clearly link the pneumonia to another disease.
Coding tip
Verify the causal condition and sequencing instructions before assigning J17.