- Perirenal - see condition
- Perisalpingitis (see also Salpingo-oophoritis) 614.2
- Perisigmoiditis 569.89
- Perisplenitis (infectional) 289.59
- Perispondylitis - see Spondylitis
- Peristalsis reversed or visible 787.4
- Peritendinitis (see also Tenosynovitis) 726.90
- Perithelioma (M9150/1) - see Pericytoma
- Peritoneum, peritoneal - see also condition
- Peritonitis (acute) (adhesive) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) 567.9
- Peritonsillar - see condition
- Peritonsillitis 475
- Perityphlitis (see also Appendicitis) 541
- Periureteritis 593.89
- Periurethral - see condition
- Periurethritis (gangrenous) 597.89
- Periuterine - see condition
- Perivaginitis (see also Vaginitis) 616.10
- Perivasculitis, retinal 362.18
- Perivasitis (chronic) 608.4
- Periventricular leukomalacia 779.7
- Perivesiculitis (seminal) (see also Vesiculitis) 608.0