Summary & Overview
CPT 29876: Arthroscopic Major Synovectomy of Knee
CPT code 29876 denotes arthroscopic major synovectomy of the knee, a minimally invasive surgical procedure to remove inflamed or damaged synovial tissue from two or more knee compartments. Nationally, this code is used to capture operative management of synovitis and related pathology that causes pain and restricted motion. Accurate coding for this procedure supports clinical documentation, appropriate claims processing, and quality measurement for orthopaedic surgical services.
This analysis covers major commercial payers and the Medicare program: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical explanation, typical sites of service, expected indications, and coding relationships to common arthroscopic knee procedures. The publication also outlines commonly billed companion and related arthroscopy codes for context.
Healthcare administrators, coding professionals, and orthopaedic clinicians will learn how CPT code 29876 fits into surgical knee care, the typical clinical scenarios warranting a major synovectomy, and how it relates to other arthroscopic knee procedures. The content aims to clarify coding intent and clinical scope to support consistent billing and documentation practices across institutional and payer settings.
Billing Code Overview
CPT code 29876 describes an arthroscopic major synovectomy of the knee. The procedure involves insertion of an arthroscope and instruments into the knee joint to inspect and excise inflamed or damaged synovial tissue from two or more compartments (including medial and/or lateral compartments) to relieve pain and improve range of motion.
Service Type: Arthroscopic knee surgical procedure — major synovectomy
Typical Site of Service: Hospital outpatient department or ambulatory surgery center, where operative arthroscopy with instrumentation is performed under appropriate anesthesia.
Clinical & Coding Specifications
Clinical Context
A 58-year-old patient with a history of progressive knee pain, stiffness, and limited range of motion presents with mechanical symptoms and failure of conservative therapy (physical therapy, NSAIDs, intra-articular steroid) for symptomatic knee synovitis and degenerative changes. Preoperative evaluation documents focal synovial hypertrophy and inflammatory synovitis on MRI and persistent pain localized to the medial and lateral compartments. The orthopaedic surgeon schedules an arthroscopic synovectomy of two or more compartments of the knee to excise inflamed synovium, reduce pain, and improve motion.
The clinical workflow includes preoperative evaluation and clearance, anesthesia (typically general or regional), arthroscopic portal placement, diagnostic inspection of the joint with an arthroscope, insertion of arthroscopic instruments, synovial excision from the involved compartments (medial, lateral, and/or suprapatellar), hemostasis, and arthroscopic lavage. Postoperative recovery involves PACU observation, discharge instructions, analgesia, and early range-of-motion physical therapy with scheduled follow-up for wound checks and functional assessment.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work, time, or complexity substantially exceeds typical for 29876 and documentation supports increased work. |