Abnormal findings on diagnostic imaging of lung (R91) ICD-10-CM
The R91 code range covers abnormal findings on diagnostic imaging of lung with 3 ICD-10-CM diagnosis codes. 2 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the R91 Range 3 codes · 2 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the R91 range.
Solitary Pulmonary Nodule
A single lung lesion that is characterized by a small round mass of tissue, usually less than 1 cm in diameter, and can be detected by chest radiography. A solitary pulmonary nodule can be associated with neoplasm, tuberculosis, cyst, or other anomalies in the lung, the CHEST WALL, or the PLEURA.
About the R91 Code Range
An image of the lung can show an abnormal finding without identifying a diagnosis.
R91 separates a solitary pulmonary nodule, a single nodule in the lung, from other nonspecific findings in the lung field. R91.1 identifies the solitary nodule; R91.8 identifies the other findings.
Questions About This Page
How many billable codes are in the R91 range?
Of the 3 codes in this range, 2 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the R91 range classify?
The range classifies abnormal findings on diagnostic imaging of lung. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
