A subgroup of providers, podiatrists, are also required to maintain records on each patient, by law. These records should be kept for a minimum of seven years. Chiropractors are also subject to the recordkeeping requirement in the state of Washington.ll patient records must be kept for a minimum of six years after the discharge or transfer of the patient. The state also regulates patient medication records maintained by a pharmacy. Pharmacies may maintain their records manually or electronically.