Here is the ICD website showing the Medicare/Medicaid billing Codes related to C19 vax status:
https://www.icd10data.com/ICD10CM/Codes/Z00-Z99/Z20-Z29/Z28-/Z28.310
Codes have been around for awhile to track various personal decisions about vaccines. But now - they are refining the Code numbers to identify people who are refusing mRNA shots.
Sounds like the best strategy at a doctor's office is to say "I refuse to state" my vax status, or simply state, "It is a private matter."
I'd also check my medical chart to ensure no vax-status codes have been added.
They are now trying to say flu shots are necessary to be fully vaccinated.
I don’t care. I will not take them.