| R90 | Abnormal findings on diagnostic imaging of central nervous system |
| R90.0 | Intracranial space-occupying lesion found on diagnostic imaging of central nervous system |
| R90.8 | Other abnormal findings on diagnostic imaging of central nervous system |
| R90.81 | Abnormal echoencephalogram |
| R90.82 | White matter disease, unspecified |
| R90.89 | Other abnormal findings on diagnostic imaging of central nervous system |
| R91 | Abnormal findings on diagnostic imaging of lung |
| R91.1 | Solitary pulmonary nodule |
| R91.8 | Other nonspecific abnormal finding of lung field |
| R92 | Abnormal and inconclusive findings on diagnostic imaging of breast |
| R92.0 | Mammographic microcalcification found on diagnostic imaging of breast |
| R92.1 | Mammographic calcification found on diagnostic imaging of breast |
| R92.2 | Inconclusive mammogram |
| R92.8 | Other abnormal and inconclusive findings on diagnostic imaging of breast |
| R93 | Abnormal findings on diagnostic imaging of other body structures |
| R93.0 | Abnormal findings on diagnostic imaging of skull and head, not elsewhere classified |
| R93.1 | Abnormal findings on diagnostic imaging of heart and coronary circulation |
| R93.2 | Abnormal findings on diagnostic imaging of liver and biliary tract |
| R93.3 | Abnormal findings on diagnostic imaging of other parts of digestive tract |
| R93.4 | Abnormal findings on diagnostic imaging of urinary organs |
| R93.41 | Abnormal radiologic findings on diagnostic imaging of renal pelvis, ureter, or bladder |
| R93.42 | Abnormal radiologic findings on diagnostic imaging of kidney |
| R93.421 | Abnormal radiologic findings on diagnostic imaging of right kidney |
| R93.422 | Abnormal radiologic findings on diagnostic imaging of left kidney |
| R93.429 | Abnormal radiologic findings on diagnostic imaging of unspecified kidney |
| R93.49 | Abnormal radiologic findings on diagnostic imaging of other urinary organs |
| R93.5 | Abnormal findings on diagnostic imaging of other abdominal regions, including retroperitoneum |
| R93.6 | Abnormal findings on diagnostic imaging of limbs |
| R93.7 | Abnormal findings on diagnostic imaging of other parts of musculoskeletal system |
| R93.8 | Abnormal findings on diagnostic imaging of other specified body structures |
| R93.81 | Abnormal radiologic findings on diagnostic imaging of testis |
| R93.811 | Abnormal radiologic findings on diagnostic imaging of right testicle |
| R93.812 | Abnormal radiologic findings on diagnostic imaging of left testicle |
| R93.813 | Abnormal radiologic findings on diagnostic imaging of testicles, bilateral |
| R93.819 | Abnormal radiologic findings on diagnostic imaging of unspecified testicle |
| R93.89 | Abnormal findings on diagnostic imaging of other specified body structures |
| R93.9 | Diagnostic imaging inconclusive due to excess body fat of patient |
| R94 | Abnormal results of function studies |
| R94.0 | Abnormal results of function studies of central nervous system |
| R94.01 | Abnormal electroencephalogram [EEG] |
| R94.02 | Abnormal brain scan |
| R94.09 | Abnormal results of other function studies of central nervous system |
| R94.1 | Abnormal results of function studies of peripheral nervous system and special senses |
| R94.11 | Abnormal results of function studies of eye |
| R94.110 | Abnormal electro-oculogram [EOG] |
| R94.111 | Abnormal electroretinogram [ERG] |
| R94.112 | Abnormal visually evoked potential [VEP] |
| R94.113 | Abnormal oculomotor study |
| R94.118 | Abnormal results of other function studies of eye |
| R94.12 | Abnormal results of function studies of ear and other special senses |
| R94.120 | Abnormal auditory function study |
| R94.121 | Abnormal vestibular function study |
| R94.128 | Abnormal results of other function studies of ear and other special senses |
| R94.13 | Abnormal results of function studies of peripheral nervous system |
| R94.130 | Abnormal response to nerve stimulation, unspecified |
| R94.131 | Abnormal electromyogram [EMG] |
| R94.138 | Abnormal results of other function studies of peripheral nervous system |
| R94.2 | Abnormal results of pulmonary function studies |
| R94.3 | Abnormal results of cardiovascular function studies |
| R94.30 | Abnormal result of cardiovascular function study, unspecified |
| R94.31 | Abnormal electrocardiogram [ECG] [EKG] |
| R94.39 | Abnormal result of other cardiovascular function study |
| R94.4 | Abnormal results of kidney function studies |
| R94.5 | Abnormal results of liver function studies |
| R94.6 | Abnormal results of thyroid function studies |
| R94.7 | Abnormal results of other endocrine function studies |
| R94.8 | Abnormal results of function studies of other organs and systems |
| R97 | Abnormal tumor markers |
| R97.0 | Elevated carcinoembryonic antigen [CEA] |
| R97.1 | Elevated cancer antigen 125 [CA 125] |
| R97.2 | Elevated prostate specific antigen [PSA] |
| R97.20 | Elevated prostate specific antigen [PSA] |
| R97.21 | Rising PSA following treatment for malignant neoplasm of prostate |
| R97.8 | Other abnormal tumor markers |
| R99 | Ill-defined and unknown cause of mortality |