- Pinworms (disease) (infection) (infestation) 127.4
- Piry fever 066.8
- Pistol wound - see Gunshot wound
- Pit, lip (mucus), congenital 750.25
- Pitchers' elbow 718.82
- Pithecoid pelvis 755.69
- Pithiatism 300.11
- Pitted - see also Pitting
- Pitting (edema) (see also Edema) 782.3
- Pituitary gland - see condition
- Pituitary snuff-takers' disease 495.8
- Pityriasis 696.5
- Placenta, placental
- Placentitis
- Plagiocephaly (skull) 754.0
- Plague 020.9
- Planning, family V25.09
- Plaque
- Plasma cell myeloma 203.0
- Plasmacytoma, plasmocytoma (solitary) (M9731/1) 238.6
- Plasmacytopenia 288.59
- Plasmacytosis 288.64