TAMPA, Fla., July 13, 2016 /PRNewswire/ -- CareDx, Inc. (NASDAQ: CDNA), a molecular diagnostics company, today called for Medicare Administrative Contractor First Coast Service Options, Inc. to reverse its recent proposal to drastically reduce reimbursement for its FDA-cleared diagnostic test AlloMap, which measures gene expression levels to help clinicians determine a heart transplant recipient's risk for organ rejection.