| L40 | Psoriasis |
| L40.0 | Psoriasis vulgaris |
| L40.1 | Generalized pustular psoriasis |
| L40.2 | Acrodermatitis continua |
| L40.3 | Pustulosis palmaris et plantaris |
| L40.4 | Guttate psoriasis |
| L40.5 | Arthropathic psoriasis |
| L40.50 | Arthropathic psoriasis, unspecified |
| L40.51 | Distal interphalangeal psoriatic arthropathy |
| L40.52 | Psoriatic arthritis mutilans |
| L40.53 | Psoriatic spondylitis |
| L40.54 | Psoriatic juvenile arthropathy |
| L40.59 | Other psoriatic arthropathy |
| L40.8 | Other psoriasis |
| L40.9 | Psoriasis, unspecified |
| L41 | Parapsoriasis |
| L41.0 | Pityriasis lichenoides et varioliformis acuta |
| L41.1 | Pityriasis lichenoides chronica |
| L41.3 | Small plaque parapsoriasis |
| L41.4 | Large plaque parapsoriasis |
| L41.5 | Retiform parapsoriasis |
| L41.8 | Other parapsoriasis |
| L41.9 | Parapsoriasis, unspecified |
| L42 | Pityriasis rosea |
| L43 | Lichen planus |
| L43.0 | Hypertrophic lichen planus |
| L43.1 | Bullous lichen planus |
| L43.2 | Lichenoid drug reaction |
| L43.3 | Subacute (active) lichen planus |
| L43.8 | Other lichen planus |
| L43.9 | Lichen planus, unspecified |
| L44 | Other papulosquamous disorders |
| L44.0 | Pityriasis rubra pilaris |
| L44.1 | Lichen nitidus |
| L44.2 | Lichen striatus |
| L44.3 | Lichen ruber moniliformis |
| L44.4 | Infantile papular acrodermatitis [Gianotti-Crosti] |
| L44.8 | Other specified papulosquamous disorders |
| L44.9 | Papulosquamous disorder, unspecified |
| L45 | Papulosquamous disorders in diseases classified elsewhere |