Hospitals: Montana requires public hospitals retain a patient’s entire medical record for ten (10) years following discharge or patient death. For minors, the period is through the patient’s 18th birthday (or death, whichever earlier), plus ten (10) years. 

Health care providers must also maintain records of existing health care information for one (1) year following receipt of authorization to disclose that information. 

Physicians: Montana offers limited retention guidance for private practices. Consult LINK for more on what to do when your state offers limited legal guidelines for records retention policy.

MONT. CODE ANN. § 50-16-513
MONT. ADMIN. R. 37.106.402
https://bit.ly/3Be0Dzk
https://bit.ly/3S3Mmel