- Paresthesia (see also Disturbance, sensation) 782.0
- Paretic - see condition
- Parinaud's
- Parkes Weber and Dimitri syndrome (encephalocutaneous angiomatosis) 759.6
- Parkinson's disease, syndrome, or tremor - see Parkinsonism
- Parkinsonism (arteriosclerotic) (idiopathic) (primary) 332.0
- Parodontitis 523.40
- Parodontosis 523.5
- Paronychia (with lymphangitis) 681.9
- Parorexia NEC 307.52
- Parosmia 781.1
- Parotid gland - see condition
- Parotiditis (see also Parotitis) 527.2
- Parotitis 527.2
- Paroxysmal - see also condition
- Parrot fever 073.9
- Parrot's disease (syphilitic osteochondritis) 090.0
- Parry's disease or syndrome (exophthalmic goiter) 242.0
- Parry-Romberg syndrome 349.89
- Pars planitis 363.21
- Parson's disease (exophthalmic goiter) 242.0
- Parsonage-Aldren-Turner syndrome 353.5
