Almost nine in 10 suspected health care fraud cases in New York last year came from no-fault auto injury claims, a cottage industry so rife with abuse that the state Insurance Department wants to tighten regulations. Related Fraud Bureau investigations led to 159 arrests in 2010, including a Schenectady man who filed a no-fault claim, collected $5,300 for lost wages and was charged with insurance fraud and falsifying business records, the department said.