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ALL MEDICAL CODES IN CATEGORY R00-R99: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR90-R94: Abnormal findings on diagnostic imaging and in function studies, without diagnosis

2025 ICD-10-CM code R91.1

Solitary pulmonary nodule. This refers to a single, small abnormality in the lung, typically less than 3 cm in diameter, that is completely surrounded by normal lung tissue.