Summary & Overview

CPT 21600: Partial Rib Resection for Deformity or Infection

CPT code 21600 represents a surgical partial rib resection used to treat rib deformities, congenital rib anomalies, and bone infections affecting the rib. This procedure is an important, though infrequent, thoracic/orthopedic operation with implications for surgical resource use, post-operative care, and payer coverage policies nationwide. Nationally, understanding coding for rib resections informs claims accuracy, utilization monitoring, and coverage determinations for complex chest-wall procedures. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will find a concise overview of clinical context and billing considerations for CPT code 21600, plus benchmarks and policy-relevant topics such as typical sites of service, expected care settings, and payer coverage patterns. The report summarizes common billing modifiers and documentation touchpoints that influence reimbursement and claims adjudication. It also highlights areas where coding clarity affects utilization tracking and where payers may apply medical necessity reviews. Data not available in the input is noted where applicable. This summary is intended for coding professionals, surgical providers, and payer policy analysts seeking a national-level briefing on CPT code 21600.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare21600CPTrib resectionthoracic surgeryoperative proceduresurgical codingclaims accuracypostoperative care

Billing Code Overview

CPT code 21600 describes a surgical procedure in which the provider removes part of a rib to treat conditions such as rib deformities, congenital abnormalities, or bone infections. This procedure is a surgical resection of a rib (partial rib removal) performed to correct structural problems or to manage infectious or destructive bone disease.

Service type: Surgical procedure (thoracic/orthopedic surgery)
Typical site of service: Hospital operating room or ambulatory surgical center

Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and detailed payer-specific rules.

Clinical & Coding Specifications

Clinical Context

A 24-year-old patient presents with a symptomatic congenital rib deformity causing chest wall contour abnormality and localized pain. Imaging (chest radiograph and CT) confirms a malformed right fifth rib with focal cortical irregularity and no intrathoracic compromise. Conservative measures including analgesics and physical therapy failed. The surgical plan is a partial rib resection (thoracic wall approach) under general anesthesia to remove the deformed segment, relieve pain, and improve cosmetic appearance. Typical workflow: preoperative history and physical, informed consent documenting indications and risks, preoperative imaging reviewed, general anesthesia with single-lumen or double-lumen tube as indicated, incision overlying the rib, subperiosteal dissection, resection of the affected rib segment, hemostasis, layered closure with or without drains, postoperative chest radiograph as needed, pain control, and follow-up for wound check and chest wall function assessment. Typical site of service is an outpatient surgical center or hospital operating room with thoracic or general surgery capability. Common payors for authorization and claims include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when the procedure required substantially greater effort or time than typical due to extensive dissection, adhesions, or unexpected complexity.
`23`	Unusual anesthesia	Use when general anesthesia is required for a procedure that is normally performed with local or no anesthesia.
`26`	Professional component	Use when reporting only the professional interpretation component of a service (rare for this procedure).
`50`	Bilateral procedure	Use if rib resection is performed on both sides during the same operative session.
`51`	Multiple procedures	Use when other distinct surgical procedures are performed at the same operative session in addition to the rib resection.
`52`	Reduced services	Use if the procedure was partially performed or intentionally reduced in scope.
`53`	Discontinued procedure	Use if the procedure was started but stopped due to patient safety concerns before completion.
`59`	Distinct procedural service	Use when two procedures in the same anatomic region are separate and not typically bundled, to indicate distinct service.
`62`	Two surgeons	Use when two surgeons of different specialties work together as primary surgeons performing distinct portions.
`78`	Unplanned return to OR	Use when an unplanned return to the operating room for a related procedure occurs during the postoperative period.
`79`	Unrelated procedure during global period	Use when an unrelated procedure is performed during the global period of the rib resection.
`80`	Assistant surgeon	Use when an assistant surgeon performs portions of the procedure.
`81`	Minimum assistant surgeon	Use when a minimal assistant surgeon role is documented.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for surgical assistance	Use when a qualified non-physician surgical assistant provides intraoperative assistance.
`TC`	Technical component	Use when reporting only the technical component (equipment/facility) of a service (rare for this procedure).

Taxonomy Code	Specialty	Notes
207X00000X	Thoracic Surgery	Primary specialty for chest wall and rib resections.
208800000X	General Surgery	Often performs rib resections for trauma or infection when thoracic surgery not required.
207L00000X	Plastic and Reconstructive Surgery	Performs rib resections when chest wall reconstruction or cosmetic contouring is indicated.
2080P0208X	Otolaryngology - Head & Neck Surgery	May participate for upper chest or thoracic inlet deformities involving thoracic outlet.
363LP0800X	Physician Assistant	Commonly assists in perioperative care and intraoperative assistance under supervising surgeon.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M95.0`	Congenital malformation of rib(s)	Direct indication for partial rib resection to correct deformity or symptoms.
`M89.81`	Osteonecrosis of rib	Rib resection may be required for infected or necrotic bone not responsive to conservative therapy.
`M86.8`	Other osteomyelitis	Rib osteomyelitis can necessitate partial rib removal for source control.
`S22.41`	Fracture of shaft of rib, right	Nonunion or symptomatic malunion after rib fracture may require resection.
`M96.1`	Postlaminectomy syndrome of rib (postprocedural complications of bone)	Used when chronic pain or complication from prior rib surgery requires revision resection.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`20115`	Excision, clavicle or sternoclavicular joint; partial or total	May be performed when adjacent clavicular involvement requires resection in combined chest wall procedures.
`21610`	Excision or destruction of lesion of rib; single	Alternative code for focal lesion removal on a rib when less extensive than a segmental rib resection.
`21320`	Excision or curettement of rib lesion with grafting when required	Used when rib lesion debridement requires bone grafting or more extensive reconstruction.
`32551`	Tube thoracostomy, includes connection to drainage system (e.g., chest tube)	Often performed intraoperatively or postoperatively if pleural breach or drainage is required.
`31750`	Wedge resection of lung, single lobe (minor pulmonary resection)	Performed if intraoperative discovery of pulmonary involvement necessitates concomitant lung resection.