NIH offers free access to wealth of disease data.
Russo
Gene
G
D003219:Confidentiality; D016208:Databases, Factual / Q000191:economics* / Q000706:statistics & numerical data; D004194:Disease; D015894:Genome, Human; D005838:Genotype; D006801:Humans; D008019:Life Style; D009316:National Institutes of Health (U.S.); D010641:Phenotype; D017150:Public Sector / Q000191:economics; D014481:United States