My sister a Canadian visiting California became ill during her stay. She was diagnosed with terminal liver cancer spending several months in a Sacramento hospital due to complications. She had medical insurance however there was a dispute related to a pre-existing condition. The dispute remains unresolved and contact with the insurance company ceased more then two years ago shortly after her death.The bills in question total more than $600,000. What are the implications related to the California statute of limitations and the estate of my deceased sister? There is no communication with the hospitals, doctors or any medical service providers who hold the debt nor with the insurance company who provided the travel insurance.