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Jan 29, 2020 · For LAB, the external lab referral indicates MTF workload. If rectype=’R’ and the CPT code is in Appendix B (or reference table /mdr/ref/ancillary.bilat.fmt.cyxx for the corresponding year) or the 2nd CPT modifier indicates a bilateral code (mod in 50, 51 or 99) and count >1, then drvcount=count/2; else drvcount=count. ................
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