Unless some form of fraud or the like was involved in the destruction of your records, then it is a civil matter. That having been said, typically state and federal laws regarding record retention mandates apply to hospitals or similar facilities rather than to physician practices. Federal law includes HIPAA privacy regulations which require records to be retained for 6 years from when that the record was created and The Medicare Conditions of Participation (COP) requires hospitals to retain records for 5 years. As for specific state statutes, you can consult directly with a local attorney.