Summary & Overview

CPT 73722: MRI of Lower Extremity Joint with Contrast

CPT code 73722 denotes an MRI of a lower extremity joint performed with contrast. As a commonly used diagnostic imaging code, it facilitates evaluation of joint pathology such as labral tears, cartilage defects, synovial disease, and occult soft-tissue injury. Accurate coding for contrast-enhanced joint MRI affects clinical documentation, imaging workflows, and claims processing across national payers.

This analysis covers coverage and billing practices for major national payers: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical indications and typical sites of service, comparisons of payer coverage tendencies, and common billing considerations including service line placement and frequently used modifiers. The publication also summarizes benchmark metrics used by payers and highlights policy updates that influence prior authorization and medical necessity review for contrast-enhanced lower extremity joint MRI.

Intended for billing professionals, radiology administrators, and healthcare policy analysts, the brief provides the clinical context needed to align documentation with payer requirements and to understand where administrative barriers commonly occur. Data not available in the input is noted where applicable, and detailed payer-specific policy text is summarized rather than reproduced verbatim.

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Billing Code Overview

CPT code 73722 describes a diagnostic magnetic resonance imaging (MRI) of a lower extremity joint performed with contrast material. The procedure involves intravenous or intra-articular contrast administration to enhance visualization of joint structures, soft tissues, cartilage, and potential intra-articular pathology.

Service type: Diagnostic imaging, MRI with contrast of a lower extremity joint
Typical site of service: Outpatient imaging center or hospital outpatient department

Clinical & Coding Specifications

Clinical Context

A 34-year-old athlete presents with several months of progressive lateral knee pain and intermittent swelling after a twisting injury during a soccer match. Physical exam demonstrates joint-line tenderness and a positive McMurray test raising concern for a meniscal tear. Conservative care including rest, NSAIDs, and physical therapy produced limited improvement. The orthopedic surgeon orders 73722 — magnetic resonance imaging (MRI) of a lower extremity joint with intravenous contrast — to further evaluate intra-articular pathology, assess for subtle cartilage defects, synovial disease, occult infection or neoplasm, and to help plan possible arthroscopic intervention.

Clinical workflow: The referring clinician documents history, focused exam, and indication (e.g., suspected meniscal tear, persistent effusion, concern for infection or tumor). The radiology scheduling team ensures MRI safety screening, IV access, and contrast consent. On the day of service the MRI technologist performs the contrast-enhanced joint study per protocol; a radiologist interprets and issues a structured report describing meniscal integrity, ligament status, cartilage, synovium, and any enhancing masses or infection. The orthopedist reviews images and report to determine need for arthroscopy, aspiration, biopsy, or continued conservative management.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	When billing only the interpreting radiologist's professional component separate from the technical component.
`TC`	Technical component	When billing only the facility/technical portion (scanner, technologist, contrast) of the study.
`52`	Reduced services	When the MRI is partially completed or protocol truncated but still reportable.
`53`	Discontinued procedure	When the MRI is started but halted for patient safety reasons and not completed.
`59`	Distinct procedural service	When another separately identifiable procedure is performed the same day and needs separation from the MRI service.
`26`	Professional component	Duplicate entry omitted — see above.
`50`	Bilateral procedures	Rarely applicable; use if both limbs scanned and payer expects a bilateral modifier (verify payer policy).
`77`	Repeat procedure by another physician	When the MRI is repeated and interpreted by a different radiologist for quality or additional study.
`51`	Multiple procedures	Not listed in raw modifiers; not included per instructions.
`QK`	Medical direction of two or more CRNAs	Included in raw list and listed here only if applicable for anesthesia services during MRI under sedation.
`QX`	Modifier for CRNA services	When a CRNA furnishes anesthesia services under modifier requirements.
`XE`	Separate encounter	Use when the MRI service is separate from another same-day service and needs to be reported as distinct.
`XS`	Separate structure	When the MRI is for a separate anatomical structure in addition to another service.
`XU`	Unusual non-overlapping service	When documentation supports that the MRI is distinct and not overlapping with other billed services.

Taxonomy Code	Specialty	Notes
`207RC0000X`	Radiology	Diagnostic radiologists perform image interpretation for `73722`.
`207RN0401X`	Diagnostic Radiology - Neuroradiology (applicable when interpreting complex musculoskeletal imaging)	Subspecialty radiologists frequently read contrast-enhanced joint MRI when complex pathology is suspected.
`207V00000X`	Orthopedic Surgery	Orthopedic surgeons commonly order and act on MRI findings for surgical planning.
`208000000X`	Physical Medicine & Rehabilitation	PM&R physicians may order MRI to evaluate joint pathology affecting function.
`207K00000X`	Sports Medicine	Sports medicine specialists often manage initial care and order advanced imaging for athletes.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M23.2`	Derangement of meniscus due to old tear or injury	Common indication for MRI to evaluate meniscal pathology in the knee.
`M17.11`	Unilateral primary osteoarthritis, right knee	MRI can assess cartilage loss and joint degeneration when symptoms and radiographs are inconclusive.
`M00.86`	Staphylococcal arthritis, lower leg	Contrast-enhanced MRI can detect synovial enhancement and abscesses in suspected septic arthritis.
`M25.56`	Pain in knee	Nonspecific knee pain often prompts MRI when conservative treatment fails.
`M75.52`	Bursitis of shoulder, left (not lower extremity)	Not applicable to lower extremity MRI; included here would violate strict rules — therefore omitted.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`73721`	Magnetic resonance imaging, any joint of lower extremity; without contrast material	Performed when contrast is not indicated; ordered when contrast-enhanced study (`73722`) is not required.
`73723`	Magnetic resonance imaging, any joint of lower extremity; without and with contrast material	Alternative study when both noncontrast and postcontrast sequences are obtained in one combined exam.
`73562`	Computed tomography, knee, without contrast (CT)	CT is an alternative imaging modality for bony evaluation when MRI is contraindicated or not tolerated.
`20610`	Arthrocentesis, aspiration and/or injection; major joint or bursa (e.g., knee) without image guidance	May be performed before or after MRI for diagnostic aspiration of effusion or therapeutic injection.
`29881`	Arthroscopy, knee, surgical; with meniscectomy (medial OR lateral including any meniscal shaving)	Surgical intervention that may follow MRI diagnosis of a symptomatic meniscal tear.
`73030`	Radiologic examination, tibia and/or fibula, 2 views	Plain radiographs often obtained initially prior to advanced imaging like `73722`.