Do I need to see a doctor each time I need a new prescription for Vyvanse?

My son has been on Vyvanse for 2 years. Federal/State law requires him to be seen every 3 months for a "med check" to obtain refills. However, his dr writes 3 (30 day) prescriptions at a time, one we take with us and the other 2 remain on file in the drs office for us to pick up the following 2 months. When we go in to pick up the perception for months 2 and 3, he is not seen by the dr... we just get it from the receptionist.

The difference is that they are not the same although both are central nervous system stimulants. It's possible that the amphetamine is the difference?

From the good guys and girls at drugs.com: "Vyvanse (lisdexamfetamine) is a central nervous system stimulant. It affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control. Concerta (methylphenidate) is a central nervous system stimulant. It affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control."