Using the current year CPT manual, provide the procedure code for the patient case. PREOPERATIVE DIAGNOSIS: Torn left lateral meniscus. POSTOPERATIVE DIAGNOSES: 1. Torn left lateral meniscus. 2. Chondromalacia, left knee. PROCEDURES PERFORMED: 1. Examination of left knee under anesthesia. 2. Arthroscopy of left knee with partial lateral meniscectomy and debridement of chondromalacia. SURGEON: Pita Hortaga, MD ANESTHESIA: General. FINDINGS: The patient was found to have significant chondromalacia in all three compartments of her left knee. She has bare bone exposed on the weight-bearing surface of the medial and lateral femoral condyles and she has significant chondromalacia on the articular surface of the patella almost down to subchondral bone. She had a degenerative tear involving the lateral meniscus. The medial meniscus appeared to be intact. The anterior cruciate ligament was intact. PROCEDURE: While under a general anesthetic, the patients left knee was examined. The collateral ligaments were intact and Lachmans test was negative, as was pivot shift. McMurrays test was negative. We then prepped the patients left leg with Betadine and draped it in a sterile fashion. An Esmarch bandage was used to exsanguinate the leg, and a tourniquet on the thigh was inflated to 300 mmHg. We ended up deflating this tourniquet after about 5-10 minutes as the bleeding was not controlled. The total tourniquet time including the first and second tourniquet times was about 43 minutes. We created three portals. The first was placed along the superior anterolateral aspect. The second was placed along the inferior anteromedial aspect and the third along the inferior anterolateral aspect of the knee. We distended the knee with lactated Ringers solution. We examined the suprapatellar pouch and the medial and lateral gutters. She appeared to have somewhat hypertrophic synovium and was somewhat reddish and angry in appearance. We then examined the articular surface of the patella and found that she had significant chondromalacia characterized by fraying almost down to subchondral bone. We used a shaver to trim this area. The adjacent surface of the trochlea, however, appeared to be in relatively good condition. We then examined the medial compartment, and the medial meniscus appeared to be in relatively good condition with only minor fraying. We then examined the articular surface of the medial femoral condyle and noticed that she had a raised blister of articular cartilage. There was fissure over this and we could pass a probe underneath the articular cartilage. We gave some consideration to leaving this alone; however, we eventually elected to unroof this blister. This left an area of bare bone on the weight-bearing surface of the medial femoral condyle. This blister was therefore made up of cartilage that had no attachment to the subchondral bone and was fairly easily debrided with a shaver. We tried to smooth this area as best as possible with the shaver and soften the edges around this area. We then turned our attention to the notch area and probed the anterior cruciate ligament. It was intact. There was an obvious tear of the lateral meniscus as there was a fragment of the meniscus lying against the anterior cruciate ligament, which we removed. She had a degenerative tear involving the entire length of the lateral meniscus. We used a combination of basket forceps and the shaver to trim the lateral meniscus back to a stable rim. The lateral compartment has significant chondromalacia in both the femur and the tibia. The articular surface on the lateral femoral condyle has worn almost down to subchondral bone, and subchondral bone actually could be seen through the thin layer of articular cartilage. We used the shaver to trim the chondromalacia as best as possible. At this point, then, we looked for any remaining loose fragments and drain the knee. We then injected 80 mg of Depo-Medrol with 2 ml of 1% Xylocaine. The skin incisions were closed using 4-0 nylon suture, and sterile dressings were applied under ABD pads and an ACE wrap. She was taken from the operating room in good condition breathing spontaneously. The final sponge and needle counts were correct. The prognosis for her left knee is only fair since she does have significant chondromalacia in all three compartments.