ICD-10-CM 2027
ICD-10 code for lung coin lesion
From the official ICD-10-CM alphabetic index entry “Lesion (s) (nontraumatic) › lung (coin)”. Page updated September 29, 2026.
About coding lung coin lesion
The ICD-10-CM code for lung coin lesion is R91.1 (Solitary pulmonary nodule).
Within R91 (abnormal findings on diagnostic imaging of lung), R91.1 is specifically for Solitary pulmonary nodule. Related codes cover other nonspecific abnormal finding of lung field (R91.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 205 (Other Respiratory System Diagnoses with MCC, relative weight 1.8244) and DRG 206 (Other Respiratory System Diagnoses without MCC, relative weight 0.9257), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about lung coin lesion ICD-10 codes
What is the ICD-10 code for lung coin lesion?
- R91.1 — Solitary pulmonary nodule.
Is R91.1 billable?
- Yes. R91.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R91.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R91.1 as a principal diagnosis.
Is R91.1 a CC or MCC?
- No. R91.1 is neither a CC nor an MCC under MS-DRG v44.0.