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.