R91: Abnormal findings on diagnostic imaging of lung
Codes under R91 (Abnormal findings on diagnostic imaging of lung). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| R91.1 | Solitary pulmonary nodule | ✓ |
| R91.1 | Solitary pulmonary nodule | ✓ |
| R91.8 | Other nonspecific abnormal finding of lung field | ✓ |
| R91.8 | Other nonspecific abnormal finding of lung field | ✓ |
Frequently asked questions
What is ICD-10-CM code R91?
R91 is an ICD-10-CM category covering Abnormal findings on diagnostic imaging of lung. It contains 4 more specific diagnosis codes, 4 of which are billable.
Is R91 a billable code?
No — R91 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example R91.1 — Solitary pulmonary nodule). 4 of the 4 codes under R91 are billable.
What codes fall under R91?
R91 includes R91.1, R91.1, R91.8, R91.8. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free