| Rigid, rigidity - see also condition | 
  |  | 
  |  | 
  | Riley-Day syndrome (familial dysautonomia) 742.8 | 
  | RIND (reversible ischemic neurological deficit) 434.91 | 
  |  | 
  | Ring(s) | 
  |  | 
  | Ringed hair (congenital) 757.4 | 
  | Ringing in the ear (see also Tinnitus) 388.30 | 
  |  | 
  |  | 
  |  | 
  | Risk | 
  |  | 
  | Ritter's disease (dermatitis exfoliativa neonatorum) 695.81 | 
  |  | 
  | Rivalta's disease (cervicofacial actinomycosis) 039.3 | 
  | River blindness 125.3  [360.13] | 
  |  | 
  |  | 
  |  | 
  | Robinson's (hidrotic) ectodermal dysplasia 757.31 | 
  | Robles' disease (onchocerciasis) 125.3  [360.13] | 
  | Rochalimea- see Rickettsial disease | 
  | Rocky Mountain fever (spotted) 082.0 | 
  | Rodent ulcer (M8090/3) - see also Neoplasm, skin, malignant | 
  |  | 
  | Roentgen ray, adverse effect - see Effect, adverse, x-ray | 
  |  | 
  | Roger's disease (congenital interventricular septal defect) 745.4 | 
  | Rokitansky's | 
  |  | 
  | Rokitansky-Aschoff sinuses (mucosal outpouching of gallbladder) (see also Disease, gallbladder) 575.8 | 
  | Rokitansky-Kuster-Hauser syndrome (congenital absence vagina) 752.49 | 
  | Rollet's chancre (syphilitic) 091.0 | 
  |  | 
  | Romano-Ward syndrome (prolonged QT interval syndrome) 426.82 | 
  |  | 
  | Romberg's disease or syndrome 349.89 | 
  | Roof, mouth - see condition | 
  |  | 
  |  | 
  |  | 
  | Rose | 
  |  | 
  | Rosen-Castleman-Liebow syndrome (pulmonary proteinosis) 516.0 | 
  | Rosenbach's erysipelatoid or erysipeloid 027.1 | 
  | Rosenthal's disease (factor XI deficiency) 286.2 | 
  |  | 
  |  | 
  | Rossbach's disease (hyperchlorhydria) 536.8 | 
  |  | 
  | Rossle-Urbach-Wiethe lipoproteinosis 272.8 | 
  |  | 
  | Rostan's asthma (cardiac) (see also Failure, ventricular, left) 428.1 | 
  | Rot | 
  |  | 
  | Rot-Bernhardt disease 355.1 | 
  | Rotation | 
  |  | 
  |  | 
  | Roth's disease or meralgia 355.1 | 
  | Roth-Bernhardt disease or syndrome 355.1 | 
|  |  |