Drug users, desperate to break addictions to heroin or pain pills, are pawns in a sprawling national network of insurance fraud, an investigation by The Boston Globe and STAT has found. They are being sent to treatment centers hundreds of miles from home for expensive, but often shoddy, care that is paid for by premium health insurance benefits procured with fake addresses. Patient brokers are paid a fee to place insured people in treatment centers, which pocket thousands of dollars in claims for each patient. Patients from across the United States have been taken in by these profiteers capitalizing on the surge in opioid addiction. The patients are often enrolled through HealthCare.gov, the online insurance marketplace created by the Affordable Care Act that connects patients to insurers in dozens of states. The brokers, patients' families, or marketers for the treatment centers pay the insurance premium. Within a few weeks, the insurer is billed tens of thousands of dollars for what is often subpar care. Many patients have no idea how their insurance coverage was obtained or that they are part of a scam. They are often told they are receiving free care - or that their insurance is being taken care of by the patient broker. Some find out their coverage is from a company in a state where they have never lived only when a billing problem arises or when the broker stops paying the premium. By then, they're far from home, stranded without any insurance.