Massachusetts Subscriber
Answer: Code G0145 (Screening cytopathology, cervical or vaginal [any reporting system], collected in preservative fluid, automated thin-layer preparation, with screening by automated system and manual rescreening under physician supervision) is the Medicare code that the lab bills for the screening Pap smear. You shouldn't report this code, because your physician office is not doing the interpretation.
If Blue Cross Blue Shield of Massachusetts is now paying on preventive codes (99384-99387 and 99394-99397), you are probably better off in any case. The preventive codes have relative value units assigned, but BCBS developed S0612 (Annual gynecological exam; established patient) for its own reporting purposes.