| R20 | Disturbances of skin sensation |
| R20.0 | Anesthesia of skin |
| R20.1 | Hypoesthesia of skin |
| R20.2 | Paresthesia of skin |
| R20.3 | Hyperesthesia |
| R20.8 | Other disturbances of skin sensation |
| R20.9 | Unspecified disturbances of skin sensation |
| R21 | Rash and other nonspecific skin eruption |
| R22 | Localized swelling, mass and lump of skin and subcutaneous tissue |
| R22.0 | Localized swelling, mass and lump, head |
| R22.1 | Localized swelling, mass and lump, neck |
| R22.2 | Localized swelling, mass and lump, trunk |
| R22.3 | Localized swelling, mass and lump, upper limb |
| R22.30 | Localized swelling, mass and lump, unspecified upper limb |
| R22.31 | Localized swelling, mass and lump, right upper limb |
| R22.32 | Localized swelling, mass and lump, left upper limb |
| R22.33 | Localized swelling, mass and lump, upper limb, bilateral |
| R22.4 | Localized swelling, mass and lump, lower limb |
| R22.40 | Localized swelling, mass and lump, unspecified lower limb |
| R22.41 | Localized swelling, mass and lump, right lower limb |
| R22.42 | Localized swelling, mass and lump, left lower limb |
| R22.43 | Localized swelling, mass and lump, lower limb, bilateral |
| R22.9 | Localized swelling, mass and lump, unspecified |
| R23 | Other skin changes |
| R23.0 | Cyanosis |
| R23.1 | Pallor |
| R23.2 | Flushing |
| R23.3 | Spontaneous ecchymoses |
| R23.4 | Changes in skin texture |
| R23.8 | Other skin changes |
| R23.9 | Unspecified skin changes |