Hi, Is there a universally agreed upon meaning for "once every 12 months"? No, there isn't. If it is very important, you need to ask for clarification.
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That's a good question. Medicare pays for an "annual wellness visit" to my care provider once every 12 months. I had a visit on 11/5/2018. Next year I had a visit on 11/23/2019 and Medicare would not pay because the interval needed to be 12 full months.