Disclosed is a method of controlling operation of a medical device that regulates delivery of a fluid medication to a user. The method receives meter-generated values that are indicative of a physiological characteristic of the user, and are produced in response to operation of an analyte meter device. The method obtains sensor-generated values that are indicative of the physiological characteristic of the user, and are produced in response to operation of a continuous analyte sensor device, different than the analyte meter device. The medical device is operated in different modes when: a valid meter-generated value is available; a valid meter-generated value is unavailable and a current sensor-generated value satisfies first quality criteria; or a valid meter-generated value is unavailable and the current sensor-generated value satisfies second quality criteria but does not satisfy the first quality criteria.