My blood sugar level was under 200?

My blood sugar level is under 200. According to my research online you have to be 200 and above to be considered diabetic. But according to my doctor, I'm diabetic. Was I lied to or I'm I not understanding something here. I'm low on iron and I have sleep apnea and supposedly that can cause a false high reading on A1c. Should I get a 2nd opinion?

My blood sugar level was under 200?
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