Not my area of expertise, but ...
Did the physician begin the procedure and discontinue due to stenotic os?
If so, then I'd use -53 modifier.
I learned that the -52 modifier is for circumstances where the physician completes a procedure that is less than the described procedure, i.e. the plan was to do something less than the full procedure. While the -53 modifier is used when some unforeseen circumstance requires that the procedure be discontinued. I think this more clearly describes the scenario you have given.
However, if the physician didn't get any farther along than examining the patient, then you might only have an E/M code.
F Tessa Bartels, CPC, CPC-E/M
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