ICD-10-CM
- Radiotherapy session
- RAEB (refractory anemia with excess blasts)
- Ragpicker's disease
- Ragsorter's disease
- Raillietiniasis
- Railroad neurosis
- Railway spine
- Rake teeth, tooth
- Rales
- Ramifying renal pelvis
- Rasmussen encephalitis
- Rathke's pouch tumor
- Raymond (-Céstan) syndrome
- Recrudescent typhus (fever)
- Recruitment, auditory
- Rectalgia
- Rectitis
- Red bugs
- Red-cedar lung or pneumonitis
- Refsum's disease or syndrome
- Reichmann's disease or syndrome
- Reifenstein syndrome
- Release from prison, anxiety concerning
- Remittent fever (malarial)
- Rendu-Osler-Weber disease or syndrome
- Reninoma
- Renon-Delille syndrome
- Reovirus, as cause of disease classified elsewhere
- Repeated falls NEC
- Replaced chromosome by dicentric ring
- Request for expert evidence
- Respite care
- Restless legs (syndrome)
- Restlessness
- Rests, ovarian, in fallopian tube
- Restzustand (schizophrenic)
- Reticular erythematous mucinosis
- Reticulocytosis
- Reticulohistiocytoma (giant-cell)
- Reticuloid, actinic
- Retortamoniasis
- Retractile testis
- Retrognathia, retrognathism (mandibular) (maxillary)
- Retrograde menstruation
- Retroperitonitis
- Retroprosthetic membrane
- Retrosternal thyroid (congenital)
- Retrusion, premaxilla (developmental)
- Rett's disease or syndrome
- Reverse peristalsis
- Reye's syndrome
- Rhinolith (nasal sinus)
- Rhinomegaly
- Rhinophyma
- Rhinoscleroma
- Rhinosporidiosis
- Rhinovirus infection NEC
- Rhizomelic chondrodysplasia punctata
- Rhytidosis facialis
- Riboflavin deficiency
- Rickettsia 364D/R. philipii (Pacific Coast tick fever)
- Rickettsialpox (Rickettsia akari)
- Ridged ear, congenital
- Rieger anomaly or syndrome
- Riehl's melanosis
- Rietti-Greppi-Micheli anemia
- Riga (-Fede) disease
- Right aortic arch
- Right middle lobe syndrome
- Riley-Day syndrome
- RIND (reversible ischemic neurologic deficit)
- Ringed hair (congenital)
- Rise, venous pressure
- Rising, PSA following treatment for malignant neoplasm of prostate
- Ritter's disease
- Rivalry, sibling
- Rivalta's disease
- River blindness
- Robin (-Pierre) syndrome
- Robinow-Silverman-Smith syndrome
- Robinson's (hidrotic) ectodermal dysplasia or syndrome
- Robles' disease
- Rocky Mountain (spotted) fever
- Roger's disease
- Rokitansky-Aschoff sinuses (gallbladder)
- Romano-Ward (prolonged QT interval) syndrome
- Romberg's disease or syndrome
- Rosary, rachitic
- Rosenbach's erysipeloid
- Rosenthal's disease or syndrome
- Ross River disease or fever
- Rothmund (-Thomson) syndrome
- Rotor's disease or syndrome
- Roussy-Lévy syndrome
- Rubinstein-Taybi syndrome
- Runaway [from current living environment]
- Runeberg's disease
- Running out of money
- Runny nose
- Russell-Silver syndrome
- Russian spring-summer type encephalitis
- Rust's disease (tuberculous cervical spondylitis)
- Ruvalcaba-Myhre-Smith syndrome
- Rytand-Lipsitch syndrome