Summary & Overview
CPT 27310: Knee Arthrotomy for Exploration and Drainage
CPT code 27310 captures an open surgical incision into the knee joint for exploration and removal of pus, foreign material, or loose debris. This surgical arthrotomy is clinically significant because it addresses septic or mechanically obstructive intra-articular processes that, if untreated, can lead to joint destruction, systemic infection, or prolonged disability. Nationally, the code is relevant across hospital and ambulatory surgical settings where emergency and elective joint drainage procedures are performed.
Key payers referenced in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical settings of care, and expected service classification. The publication outlines common billing considerations, typical modifier usage (listed separately), and benchmarking perspectives across major payers. It also highlights policy and coverage themes that affect prior authorization, inpatient versus outpatient designation, and documentation requirements tied to surgical arthrotomy of the knee.
This summary equips coding managers, surgical billing teams, and policy analysts with the core facts about CPT code 27310, helping stakeholders understand where the procedure fits in service lines and payer frameworks. Data not available in the input is noted where applicable in detailed sections.
Billing Code Overview
CPT code 27310 describes an open incision into the knee joint for exploration and removal of pus, foreign bodies, or loose material. The procedure involves surgically opening the knee joint, inspecting internal structures, and evacuating infectious or extraneous contents to restore joint integrity and reduce inflammation.
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Service type: Surgical incision and drainage/exploratory procedure of the knee joint
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Typical site of service: Operating room or procedure suite, often in an inpatient or outpatient surgical setting depending on clinical severity
Clinical & Coding Specifications
Clinical Context
A 56-year-old male presents to the emergency department with a 3-day history of progressive right knee pain, swelling, erythema, and fever. Physical exam demonstrates a warm, swollen knee with limited range of motion and severe pain on passive movement. Joint aspiration in triage reveals purulent fluid with elevated white blood cells and Gram-positive cocci on Gram stain. The orthopedic surgeon is consulted and performs an open incision and drainage of the knee joint in the operating room under regional or general anesthesia. The surgeon makes a sterile incision over the affected joint, explores the joint space, irrigates copiously, evacuates purulent material and any loose bodies, obtains intraoperative cultures, and places a drain if indicated. The patient is admitted for intravenous antibiotics and postoperative monitoring, with documentation of preoperative consent, intraoperative findings (pus, synovitis, loose fragments), cultures sent, and postoperative plan.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work or time substantially exceeds typical for 27310, documented with justification and operative report. |
23 |