- Penitis 607.2
- Penta X syndrome 758.81
- Pentalogy (of Fallot) 745.2
- Pentosuria (benign) (essential) 271.8
- Peptic acid disease 536.8
- Peregrinating patient V65.2
- Perforated - see Perforation
- Perforation, perforative (nontraumatic)
- Peri-ileitis (subacute) 569.89
- Periadenitis mucosa necrotica recurrens 528.2
- Periangiitis 446.0
- Periantritis 535.4
- Periappendicitis (acute) (see also Appendicitis) 541
- Periarteritis (disseminated) (infectious) (necrotizing) (nodosa) 446.0
- Periarthritis (joint) 726.90
- Periarthrosis (angioneural) - see Periarthritis
- Peribronchitis 491.9
- Pericapsulitis, adhesive (shoulder) 726.0
- Pericarditis (granular) (with decompensation) (with effusion) 423.9
- Pericardium, pericardial - see condition
- Pericellulitis (see also Cellulitis) 682.9
- Pericementitis 523.40
