CPT code 23800 denotes surgical immobilization (arthrodesis) of the glenohumeral joint using fixation devices to restore shoulder stability and function, commonly used for severe arthritis or failed shoulder arthroplasty. This procedure is nationally relevant because it addresses complex, high-acuity shoulder conditions that drive surgical utilization, resource needs, and post-operative care pathways across hospital and ambulatory surgical settings. Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, the typical service setting, and what to expect in payer coverage discussions. The publication also summarizes common billing and coding considerations, typical modifiers encountered, and areas where policy updates or payer guidelines can affect authorization and reimbursement processes. Intended for clinicians, billing professionals, and policy analysts, the content outlines benchmarks and practical considerations for documenting medical necessity, expected sites of service, and where payer policies most often influence care delivery for shoulder arthrodesis. Data not available in the input is noted where applicable.