Orthopedic Coding Alert

Question: Is there a CPT code for thermal shrinkage of the knee or shoulder?

Minnesota Subscriber

Answer: CPT does not include a specific code for thermal shrinkage, so you should report the code for unlisted arthroscopy procedure (29999) when the orthopedist performs thermal capsular shrinkage on the shoulder or thermal shrinkage of the knee. Send the insurer a copy of the operative report, along with a short letter (written by the physician) describing how he or she used the arthroscope as a guide for the thermal probe.

To determine reimbursement, cite a comparative code in your letter to the insurer. For instance, if you performed thermal shrinkage of the knee, describe how 29888 (Arthroscopically aided anterior cruciate ligament repair/augmentation or reconstruction) compares and contrasts to thermal ACL shrinkage. Because you will be asking for less reimbursement than would accompany 29888, your letter should say, for example, "It is my estimation that the thermal ACL shrinkage is ___ percent less work than 29888, therefore, I am requesting $___ in reimbursement."

Many carriers consider thermal shrinkage procedures experimental and do not reimburse for them, so always get preapproval from your insurer.