Bizarre California health care sitch

Same think happened to my mother at hospital but in a different state. I received her bill whick was her last hospitalization. I paid the bill in full. About 6 months later I get a bill from the hospital for $600 or so. She had not returned to the hospital and had since passed away. I called and asked what the charges were for. They refused to explain charges hiding behind the HIPA law. I explained she was deceased and I had paid all bills for her and that without an explanation that this one was going to go unpaid. They didn't get paid. I have a policy of not paying for what I don't know about. They have their rules I have my mine.