Wiki Knee manipulation w/ MAC

I would bill your example with 27570 using modifier 52. Per Optum EncoderPro's definition of modifier 52: Under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. Under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. This provides a means of reporting reduced services without disturbing the identification of the basic service.
 
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