- Carcinoma, Lewis Lung
- Carcinoma, Signet Ring Cell
- Cardiac Complexes, Premature
- Cardiac Valvular Defect, Developmental
- Cardiac Valvular Dysplasia, X-Linked
- Cardiomyopathy, Dilated, 1g
- Cardiomyopathy, Dilated, 1j
- Moyamoya Disease 4 With Short Stature, Hypergonadotropic Hypogonadism, And Facial Dysmorphism
- Cardiomyopathy, Familial Hypertrophic, 14
- Mucolipidosis 2
- Cardiovascular Abnormalities
- Carotid Artery Diseases
- Carotid Artery Injuries
- Epiphyses, Slipped
- Cartwright Nelson Fryns Syndrome
- Catalepsy
- Catamenial Pneumothorax
- Cataract, Congenital Nuclear, Autosomal Recessive 1
- Cataplexy
- Cataract 23
- Cataract 32, Multiple Types
- Mucopolysaccharidosis Ii
- Cataract, Congenital Nuclear, Autosomal Recessive 2
- Multicystic Renal Dysplasia, Bilateral
- Epstein-Barr Virus Insertion Site 1
- Erysipeloid
- Erythrocytosis, Familial, 3
- Erysipelothrix Infections
- Erythema
- Erythema Chronicum Migrans
- Erythema Elevatum Diutinum
- Cataract, Nuclear Diffuse Nonprogressive
- Catastrophic Illness
- Catatonia
- Rapp-Hodgkin Syndrome
- Central Nervous System Infections
- Cerebellar Ataxia And Hypogonadotropic Hypogonadism
- Cerebellar Ataxia And Neurosensory Deafness
- Cerebellar Ataxia, Benign, With Thermoanalgesia
- Cerebellar Ataxia, Cayman Type
- Ethanolaminosis
- Foot Diseases
- Ethmoid Sinusitis
- Euglenozoa Infections
- Euhidrotic Ectodermal Dysplasia
- Eunuchoidism, Familial Hypogonadotropic
- Euthyroid Sick Syndromes
- Evans Syndrome
- Exanthema
- Exanthema Subitum
- Exchondrosis Of Pinna, Posterior
- Exfoliative Ichthyosis, Autosomal Recessive, Ichthyosis Bullosa Of Siemens-Like
- Cerebrohepatorenal Syndrome, Variant Types
- Cervical Rib Syndrome
- Exhibitionism
- Exocrine Pancreatic Insufficiency
- Eye Injuries
- Glaucoma 3, Primary Congenital, A
- Exostoses, Multiple, Type I
- Exostoses, Multiple, Type Iii