- Pyomyositis 728.0
- Pyonephritis (see also Pyelitis) 590.80
- Pyonephrosis (congenital) (see also Pyelitis) 590.80
- Pyopericarditis 420.99
- Pyopericardium 420.99
- Pyophlebitis - see Phlebitis
- Pyopneumopericardium 420.99
- Pyopneumothorax (infectional) 510.9
- Pyorrhea (alveolar) (alveolaris) 523.40
- Pyosalpingitis (see also Salpingo-oophoritis) 614.2
- Pyosalpinx (see also Salpingo-oophoritis) 614.2
- Pyosepticemia - see Septicemia
- Pyosis
- Pyothorax 510.9
- Pyoureter 593.89
- Pyramidopallidonigral syndrome 332.0
- Pyrexia (of unknown origin) (P.U.O.) 780.60
- Pyroglobulinemia 273.8
- Pyromania 312.33
- Pyrosis 787.1
- Pyrroloporphyria 277.1
- Pyuria (bacterial) 791.9