R91.8 ICD-10-CM Code: Other nonspecific abnormal finding of lung field

R91.8 is the ICD-10-CM diagnosis code for other nonspecific abnormal finding of lung field. An unusual or abnormal finding on a chest X-ray or lung imaging that is not clearly identified as a specific disease or condition. R91.8 sits in the ICD-10-CM chapter for symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (r00-r99), within the section covering abnormal findings on diagnostic imaging and in function studies, without diagnosis (r90-r94).

R91.8 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Describe the specific abnormality observed (infiltrate, opacity, etc.) in the medical record.