CPT Code 27570: Manipulation of Knee Joint Under Anesthesia

Learn how CPT code 27570 helps restore knee joint mobility through manipulation under anesthesia to relieve pain and break up scar tissue after surgery.

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What is knee manipulation under anesthesia?

CPT code 27570 describes manipulation procedures of the knee joint under anesthesia care—often monitored anesthesia care, moderate sedation, or general anesthesia—to break scar tissue or adhesions that limit joint mobility after knee surgery (e.g., total knee arthroplasty) or trauma. The clinician applies passive movement in the thigh region and knee (including forced flexion and extension) to restore a full range of motion. It is typically performed after a trial of conservative therapy, such as physical therapy or a steroid injection, has failed to relieve pain and improve motion.

CPT code 27570 documentation requirements

To support accurate billing and demonstrate medical necessity, include in the medical record:

Indication and timing (e.g., persistent arthrofibrosis > 90 days post-op)
Range of motion of the knee joint and femur/thigh region pre- and post-manipulation
Type of anesthesia care (e.g., MAC vs. general anesthesia) and duration
Description of manipulation technique: force applied, areas treated, any other fixation devices released
Patient response, immediate complications, and planned physical therapy follow‑up or additional procedures

CPT code 27570 billing guidelines

When billing CPT code 27570 for manipulation procedures involving the knee joint or thigh region and knee, follow these key guidelines to ensure proper reporting and accurate billing:

Bill once per session — this procedure is not reported multiple times unless repeated with proper documentation (use modifier -76).
Do not report with arthroscopy or surgical procedures on the femur.
General anesthesia or monitored anesthesia care is billed separately under anesthesia codes (e.g., ASA 01402).
Applies when manipulation is performed by the same physician.
Not bundled with additional procedures like steroid injection or fixation work with other fixation devices.
Used after conservative therapy fails to restore joint mobility or reduce pain.
Supports return to normal activities through restored passive movement and improved full range of motion.

Other relevant CPT codes

29884 – Arthroscopic lysis of adhesions, knee
20610 – Injection, joint (e.g., steroid injection, arthrocentesis)
27370 – Diagnostic or therapeutic injection for arthrography
27560 – Manipulation of hip joint under anesthesia

Frequently asked questions

Manipulation under anesthesia can be performed even when other fixation devices (e.g., from anterior cruciate ligament repairs) are present, but it's essential to assess whether those devices restrict the manipulation. Documentation should clarify the impact of any fixation devices on the thigh region and knee joint.

Yes. If further treatment is needed and supported by documentation, CPT code 27570 may be reported again using modifier -76 to indicate a repeat procedure by the same physician. Be sure to include

CPT code 27570 is typically performed when a patient has limited motion in the knee joint due to scar tissue after surgery or injury. It helps restore movement through controlled manipulation under general anesthesia.