| R00-R09 | Symptoms and signs involving the circulatory and respiratory systems |
| R10-R19 | Symptoms and signs involving the digestive system and abdomen |
| R20-R23 | Symptoms and signs involving the skin and subcutaneous tissue |
| R25-R29 | Symptoms and signs involving the nervous and musculoskeletal systems |
| R30-R39 | Symptoms and signs involving the genitourinary system |
| R40-R46 | Symptoms and signs involving cognition, perception, emotional state and behavior |
| R47-R49 | Symptoms and signs involving speech and voice |
| R50-R69 | General symptoms and signs |
| R70-R79 | Abnormal findings on examination of blood, without diagnosis |
| R80-R82 | Abnormal findings on examination of urine, without diagnosis |
| R83-R89 | Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis |
| R90-R94 | Abnormal findings on diagnostic imaging and in function studies, without diagnosis |
| R97 | Abnormal tumor markers |
| R99 | Ill-defined and unknown cause of mortality |
