ICD-10 Code E84.9 – Cystic fibrosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E84.9 – Cystic fibrosis, unspecified
What it is
E84.9 identifies cystic fibrosis when the record confirms the disease but does not specify a subtype or associated manifestation. Use it for general documentation of this inherited disorder affecting mucus-producing organs.
Clinical signs
Clinical features vary; refer to documentation. Common findings include chronic respiratory symptoms, recurrent lung infections, and pancreatic or digestive involvement, but the chart must support cystic fibrosis without a more specific classification.
When to use this code
Use E84.9 when the provider documents cystic fibrosis and no more detailed code is available in the note. It may also fit when the diagnosis is confirmed, but the subtype, organ involvement, or related complication is not stated. Check documentation before defaulting to unspecified coding.
Do not use for
Do not use this code if the record specifies cystic fibrosis with another manifestation or a more precise subtype. Do not assign it for suspected cystic fibrosis without confirmation.
Coding tip
If the note names a specific complication or organ involvement, look for a more detailed E84 code before using E84.9.