Summary & Overview
CPT 27334: Knee Arthrotomy with Anterior or Posterior Synovectomy
CPT code 27334 represents an open knee arthrotomy with anterior or posterior synovectomy, a surgical intervention performed to remove inflamed synovial tissue and alleviate pain and gait disturbance. Nationally, this code is used in orthopedic surgical practices and hospital settings for patients with symptomatic synovitis, intra-articular pathology, or mechanical impairment not amenable to conservative measures. The code matters because it captures a distinct operative service with implications for surgical reimbursement, utilization tracking, and quality measurement across inpatient and outpatient surgical sites.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical and billing overview, payer coverage considerations, typical sites of service, and commonly associated modifiers. The publication highlights benchmarking context for utilization and reimbursement (where available), relevant clinical indications tied to coding, and administrative considerations that affect claim submission and payment adjudication. Data not available in the input is noted where applicable. This summary provides clinicians, coding professionals, and policy analysts with a focused briefing on the clinical intent and billing context of CPT code 27334 for national-level planning and documentation alignment.
Billing Code Overview
CPT code 27334 describes an arthrotomy of the knee joint with anterior or posterior synovectomy performed to relieve pain and improve gait. This procedure involves surgically opening the knee joint (arthrotomy) and removing inflamed synovial tissue (synovectomy) from either the anterior or posterior compartments to address sources of pain, mechanical symptoms, or impaired ambulation.
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Service type: Surgical procedure — open knee arthrotomy with synovectomy
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Typical site of service: Hospital operating room or ambulatory surgical center
Clinical & Coding Specifications
Clinical Context
A typical patient is a 45–70-year-old adult with chronic knee pain, mechanical symptoms, swelling, and reduced ambulation due to synovitis or chronic inflammatory changes of the knee joint. The patient has failed conservative therapy including activity modification, nonsteroidal anti-inflammatory drugs, intra-articular corticosteroid injections, and structured physical therapy. Preoperative evaluation includes history and physical, imaging (plain radiographs, sometimes MRI), and optimization of medical comorbidities.
In the operative workflow the patient is taken to an ambulatory surgery center or hospital operating room under general or regional anesthesia. The surgeon performs an open arthrotomy of the knee with anterior and/or posterior synovectomy as indicated to remove inflamed synovial tissue, control pain, and improve gait mechanics. Intraoperative steps include joint exposure, identification and excision of diseased synovium, hemostasis, possible irrigation and inspection of articular surfaces, and layered wound closure. Postoperative care includes pain control, early mobilization, physical therapy, wound checks, and follow-up to assess pain relief and gait improvement. Typical sites of service are the hospital outpatient department or ambulatory surgery center depending on patient comorbidities and facility resources.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work or time substantially exceeds usual for and documentation supports increased complexity. |