- Polymicrogyria 742.2
- Polymyalgia 725
- Polymyositis (acute) (chronic) (hemorrhagic) 710.4
- Polyneuritis, polyneuritic (see also Polyneuropathy) 356.9
- Polyneuropathy (peripheral) 356.9
- Polyonychia 757.5
- Polyopia 368.2
- Polyorchism, polyorchidism (three testes) 752.89
- Polyorrhymenitis (peritoneal) (see also Polyserositis) 568.82
- Polyostotic fibrous dysplasia 756.54
- Polyotia 744.1
- Polyp, polypus
- Polyphagia 783.6
- Polypoid - see condition
- Polyposis - see also Polyp
- Polyradiculitis (acute) 357.0
- Polyradiculoneuropathy (acute) (segmentally demyelinating) 357.0
- Polysarcia 278.00
- Polyserositis (peritoneal) 568.82
- Polysialia 527.7
- Polysplenia syndrome 759.0
- Polythelia 757.6