| Sub-classification | Description |
| 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 |
| R22.4 | Localized swelling, mass and lump, lower limb |
| R22.7 | Localized swelling, mass and lump, multiple sites |
| R22.9 | Localized swelling, mass and lump, unspecified |