The patients, most of whom were on Medicaid and Medicare, came into the medical offices of Jose Katz for checkups and consultations. The vast majority would leave with false diagnoses of coronary artery disease and debilitating angina and orders to undergo unnecessary tests. Katz was sentenced Wednesday to 6½ years in federal prison for fraudulently diagnosing patients with heart ailments and ordering them to undergo tests, defrauding Medicare, Medicaid and private insurers of $19 million. Katz, once a prominent medical doctor with offices in northern New Jersey and New York City, pleaded guilty in April.