There are a number of considerations involved in how long to maintain these records. Such records may have impact on billing, quality assurance, and legal defense among other things. You should consult your legal counsel to determine how your company can best address these issues.
As a guide to the medical-legal issues which should be considered, the requirements of Health General Article Section 4-403 should be reviewed. That section does not technically apply to EMS providers because they are not included in the definition of health care providers as used in that section. Nonetheless, it is probably a good guide for EMS to follow assuming the other concerns mentioned above are satisfied.
Section 4-403 provides in part:
(b) Except for a minor patient, unless a patient is notified, a health care provider may not destroy a medical record or laboratory or X-ray report about a patient for 5 years after the record or report is made.
(c) In the case of a minor patient, a medical record or laboratory or X-ray report about a minor patient may not be destroyed until the patient attains the age of majority plus 3 years or for 5 years after the record or report is made, whichever is later, unless:
(1) The parent or guardian of the minor patient is notified; or
(2) If the medical care documented in the record was provided under § 20-102(c) or § 20-103(c) of this article, the minor patient is notified.