Retention of records under the courts and civil proceedings law - ARIZ. REV. STAT. ANN. § 12-2297

A health care provider (defined as a physician, health care institution or hospital, ambulance service, or health care services organization) must retain patient records for 6 years from the last date of treatment. In the case of a minor, the records must be retained for at least 3 years after the patient’s 18th birthday or 6 years after the last date of treatment, whichever is latest.  Source data must be retained for separately from the medical record and for 6 years from the date of collection.  When a health care provider sells or retires from his practice, he or she must take steps to ensure that the records are retained according to this section.  Employees are not responsible for storing or retaining medical records but must compile the records in a customary manner. 
 
A nursing care institution must retain medical records for 6 years after the patient’s discharge.  In the case of a minor, the records must be retained for at least 3 years after the patient’s 18th birthday or 6 years after the last date of treatment, whichever is latest.