CPT 23035 Shoulder Cortex Incision Reimbursement

CPT code 23035 denotes surgical incision of the cortical bone in the shoulder to treat a focal bone infection, such as an abscess or osteomyelitis. Nationally, this code represents a targeted orthopedic surgical intervention used when infection involves the bone cortex and requires direct drainage or debridement. It is relevant for hospital and ambulatory surgical settings and affects surgical billing, utilization monitoring, and quality tracking for orthopedic infection management.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find clinical context for when the procedure is performed, typical sites of service, and payer coverage considerations. The publication outlines common billing modifiers and code relationships where available, offers benchmarking context and utilization patterns, and highlights policy or documentation elements that commonly affect claim adjudication.

This summary provides a concise reference for coding and administrative staff, clinical leads, and policy analysts seeking an overview of CPT code 23035, its clinical application, and the payer landscape. Data not available in the input will be noted where applicable in detailed sections.

Billing Code Overview

CPT code 23035 describes a surgical procedure in which the provider incises the outer shell (cortex) of a bone in the shoulder to treat a localized pocket of infection, such as an abscess or osteomyelitis. This procedure involves accessing the cortical bone to drain or debride infected material.

Service type: Surgical incision and drainage of infected bone (orthopedic procedure)
Typical site of service: Hospital operating room or outpatient surgical center, typically within orthopedic or surgical service lines

Clinical Context

A 58-year-old male with poorly controlled diabetes presents with progressive right shoulder pain, swelling, erythema, fever, and limited range of motion. Imaging (MRI) demonstrates a focal abscess involving the proximal humeral cortex with suspicion for osteomyelitis. The orthopedic surgeon evaluates the patient, obtains cultures, and recommends surgical cortical incision and drainage of the infected bone to evacuate purulent material, decompress the infected focus, and obtain bone specimens for culture and pathology. The patient receives preoperative antibiotics per institutional protocol, regional or general anesthesia, and perioperative monitoring in an ambulatory surgery center or hospital operating room. Intraoperatively, the provider incises the cortical bone of the proximal humerus, drains the subcortical abscess, performs debridement of necrotic bone, and sends specimens for microbiology. Postoperative care includes wound management, targeted antimicrobial therapy directed by culture results, and follow-up imaging and orthopedic infectious disease consultation as indicated.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work or time substantially exceeds usual, well-documented increased effort for debridement or extensive cortical work.
`23`

Taxonomy Code	Specialty	Notes
207K00000X	Orthopedic Surgery	Orthopedic surgeons commonly perform cortical incision and debridement of shoulder bone infections.
2080P0227X	General Surgery	General surgeons with orthopedics experience may manage complex infections when orthopedics coverage is not available.
207L00000X	Hand Surgery	Hand/upper extremity specialists may be involved when proximal humeral or periarticular infections affect function.
207XR0400X	Physical Medicine & Rehabilitation	Involvement for postoperative functional restoration and coordination of rehabilitation and infection management.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M86.11`	Acute hematogenous osteomyelitis, shoulder	Direct indication for cortical incision and drainage when acute bone infection is present.
`M86.12`	Chronic osteomyelitis with draining sinus, shoulder	Chronic bone infection requiring surgical debridement and cortical drainage.
`M00.81`	Staphylococcal arthritis, shoulder	Joint-associated infection that can extend to adjacent cortical bone necessitating bone drainage.
`M79.60`	Pain in limb, unspecified	Symptom code that may accompany shoulder bone infection; used as adjunctive symptom coding.
`T81.4XXA`	Infection following a procedure, initial encounter	Used when a postoperative infection of the shoulder bone requires surgical management.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`20610`	Arthrocentesis, aspiration and/or injection; major joint or bursa (e.g., shoulder)	Diagnostic aspiration for culture prior to or in conjunction with surgical management.
`11042`	Debridement, subcutaneous tissue (first 20 sq cm)	Soft tissue debridement of overlying infected tissue performed at the same operative session.
`23030`	Incision and drainage, deep abscess, bursa, or hematoma, shoulder region	Incision and drainage of deep shoulder abscesses that may accompany cortical bone infection; often performed with cortical incision.
`10180`	Incision and drainage of complex postoperative wound infection (e.g., shoulder)	Reporting wound debridement and drainage when indicated in soft tissues adjacent to the infected bone.
`38220`	Bone marrow biopsy, trocar or needle	Bone specimen procurement for diagnostic pathology/microbiology when needle sampling is used instead of open cortical incision.

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Summary & Overview

CPT 23035: Incision of Shoulder Bone Cortex for Infection