| Rhus | 
  |  | 
  | Rhythm | 
  |  | 
  | Rhytidosis facialis 701.8 | 
  | Rib - see also condition | 
  |  | 
  | Riboflavin deficiency 266.0 | 
  | Rice bodies (see also Loose, body, joint) 718.1 | 
  |  | 
  | Richter's hernia - see Hernia, Richter's | 
  |  | 
  | Rickets (active) (acute) (adolescent) (adult) (chest wall) (congenital) (current) (infantile) (intestinal) 268.0 | 
  |  | 
  | Rickettsial disease 083.9 | 
  |  | 
  |  | 
  |  | 
  |  | 
  |  | 
  | Riddoch's syndrome (visual disorientation) 368.16 | 
  | Rider's | 
  |  | 
  | Ridge, alveolus - see also condition | 
  |  | 
  |  | 
  | Riedel's | 
  |  | 
  | Rieger's anomaly or syndrome (mesodermal dysgenesis, anterior ocular segment) 743.44 | 
  |  | 
  | Rietti-Greppi-Micheli anemia or syndrome 282.49 | 
  | Rieux's hernia - see Hernia, Rieux's | 
  |  | 
  | Riga's disease (cachectic aphthae) 529.0 | 
  | Riga-Fede disease (cachectic aphthae) 529.0 | 
  | Riggs' disease (compound periodontitis) 523.40 | 
  | Right middle lobe syndrome 518.0 | 
  | 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 | 
  |  | 
|  |  |