CPT Code 73502: Radiologic Examination, Hip, 2-3 Views

Key Takeaways

CPT 73502 describes unilateral hip X-rays with 2-3 views

Append RT or LT modifiers to indicate laterality

Code requires supporting ICD-10 diagnosis for medical necessity

Global service includes both technical and professional components

Documentation must specify number of views and anatomical location

Introduction

CPT code 73502 represents a radiologic examination of the hip, unilateral, with pelvis when performed, using 2-3 views. This diagnostic imaging procedure allows clinicians to assess hip pathology, trauma, arthritis, or structural abnormalities through standard radiographic projections. The code applies to either the right or left hip and includes the pelvis within the imaging field when clinically indicated.

Proper use of 73502 requires understanding view-based distinctions within the CPT radiology series. A single view uses 73501, while four or more views require 73503. Accurate code selection directly affects reimbursement and compliance with payer policies. Clinics performing diagnostic radiology must document the number of views, anatomical side, and clinical indication to support medical necessity and avoid claim denials.

What Is CPT Code 73502?

CPT code 73502 is defined by the American Medical Association as a radiologic examination of the hip, unilateral, with pelvis when performed, using 2-3 views. The code falls within the diagnostic radiology procedures of the lower extremities section (73500-73706) and is maintained by the AMA CPT Editorial Panel. Unilateral means the procedure examines one hip-either right or left-rather than bilateral imaging of both hips simultaneously.

The pelvis is included within the imaging field when the ordering provider determines it is clinically relevant. Standard projections for a 2-3 view hip examination typically include anteroposterior (AP) pelvis, AP hip, and frog-leg lateral views. The specific views selected depend on the clinical indication, such as trauma evaluation, arthritis assessment, or pre-operative planning. Each view provides a different anatomical perspective necessary for accurate diagnosis.

This code applies to both facility and non-facility settings. In facility settings, the technical component (imaging equipment and technologist services) is billed separately from the professional component (radiologist interpretation). Non-facility settings bill the global service, which includes both components. Understanding this distinction is critical for accurate claims management and reimbursement.

CPT Code 73502: Clinical Indications

Clinical indications for CPT code 73502 include hip pain, suspected fracture, dislocation, arthritis evaluation, avascular necrosis assessment, and post-operative monitoring. Trauma cases frequently require 2-3 views to rule out femoral neck or acetabular fractures. Chronic conditions such as osteoarthritis or inflammatory arthropathies necessitate serial imaging to track disease progression.

Pre-operative planning for hip replacement surgery often uses this code to document baseline anatomy. Pediatric applications include developmental dysplasia of the hip (DDH) and Legg-Calvé-Perthes disease evaluation. The supporting ICD-10 diagnosis code must justify the medical necessity for the examination. Common diagnosis codes include M25.551 (pain in right hip), S72.001A (fracture of unspecified part of neck of right femur, initial encounter), and M16.11 (unilateral primary osteoarthritis, right hip).

CPT 73502 Modifiers

Laterality modifiers RT (right) and LT (left) must be appended to CPT 73502 to indicate which hip was examined. These modifiers are required by Medicare and most commercial payers. Failure to include the appropriate modifier results in claim denials or requests for additional information, delaying payment.

Modifier 26 (professional component) is used when only the radiologist interpretation is billed, typically in facility settings where the hospital bills the technical component separately. Modifier TC (technical component) applies when only the imaging equipment and technologist services are billed. Global billing (no modifier) includes both components and is used in non-facility settings such as outpatient imaging centres.

Additional modifiers may apply based on payer-specific policies. Modifier 59 (distinct procedural service) is rarely needed for 73502 unless bundled with another procedure during the same session. Modifier 76 (repeat procedure by same physician) applies when the examination is repeated on the same day due to technical issues or clinical necessity. Always verify modifier requirements with individual payers before submission.

CPT Code 73502 Reimbursement and Fee Schedule

Reimbursement for CPT code 73502 varies by payer, geographic location, and facility type. Medicare uses the Physician Fee Schedule (PFS) to determine payment amounts based on relative value units (RVUs). The 2026 national payment amount for 73502 is approximately $42 for the global service in non-facility settings, though actual rates differ by Medicare Administrative Contractor (MAC) region.

Commercial payers negotiate rates independently and may reimburse significantly higher or lower than Medicare. Some insurers base payments on a percentage of Medicare rates, while others use proprietary fee schedules. Geographic adjustments account for cost-of-living differences, meaning the same code reimburses differently in New York versus rural Mississippi. Facilities should verify contracted rates with each payer before performing services.

The CMS Physician Fee Schedule lookup tool provides current Medicare rates by locality. For commercial payers, contact provider relations or review the contract fee schedule. Understanding expected reimbursement helps clinics forecast revenue and identify underpayment issues. Discrepancies between billed charges and received payments should trigger contract reviews or appeals.

RVU Breakdown for CPT 73502

Relative value units (RVUs) reflect the resources required to perform a service. CPT 73502 has three RVU components: work RVU (physician effort), practice expense RVU (overhead costs), and malpractice RVU (liability insurance). The 2026 total RVU for 73502 is approximately 0.68 for the global service, though values fluctuate annually based on CMS updates.

Work RVU accounts for physician time, skill, and intensity. Practice expense RVU includes technologist salaries, equipment depreciation, and facility overhead. Malpractice RVU covers professional liability costs. Each RVU component is multiplied by a geographic practice cost index (GPCI) specific to the provider’s location, then summed and multiplied by the national conversion factor to calculate the final payment amount.

Facilities can reference the FastRVU lookup tool to view current RVU values by CPT code. Tracking RVU trends helps administrators understand reimbursement changes and adjust operational budgets accordingly. When CMS adjusts conversion factors or RVUs, practices must recalculate expected revenue to maintain financial viability.

Documentation Requirements for CPT 73502

Proper documentation supports medical necessity and justifies billing CPT code 73502. The radiology report must specify the number of views obtained, anatomical side examined, and clinical indication. Standard documentation includes patient demographics, ordering provider information, date of service, and a detailed interpretation of findings. Missing or incomplete documentation triggers claim denials and audit risk.

The ordering provider’s prescription or referral should include the ICD-10 diagnosis code justifying the examination. For example, “hip pain” without laterality (M25.559) is insufficient; the code must specify right (M25.551) or left (M25.552) to match the laterality modifier on the claim. The radiologist’s interpretation must correlate with the clinical indication and describe relevant findings, normal anatomy, and any pathology identified.

Facilities using AI-powered clinical documentation tools can automate template population and reduce transcription errors. Structured reporting templates ensure all required elements are captured consistently. Regular audits of radiology reports identify documentation gaps before payers flag them. Training staff on payer-specific requirements prevents preventable denials.

Radiology Report Components

A complete radiology report for CPT 73502 includes the following elements: patient identification, exam type and code, number and type of views, clinical indication, comparison studies if available, findings (bone, joint, soft tissue), impression, and radiologist signature. Each component serves a specific purpose in supporting the medical necessity of the procedure.

Findings should describe bone alignment, joint spaces, cortical integrity, and soft tissue shadows. Abnormalities such as fractures, dislocations, degenerative changes, or masses must be documented with anatomical precision. The impression summarises the clinical significance of findings and may recommend additional imaging or follow-up. Clear, concise language reduces interpretation errors and facilitates care coordination.

Templates standardise reporting and reduce variability. However, radiologists must customise reports to reflect actual findings rather than copying boilerplate text. Payers audit reports for generic language that suggests insufficient individualised review. Descriptive detail demonstrates medical necessity and supports the code billed.

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Common Billing Errors and How to Avoid Them

Billing errors for CPT code 73502 frequently stem from incorrect modifier usage, inadequate documentation, or mismatched diagnosis codes. Omitting the RT or LT laterality modifier is the most common mistake, resulting in automatic claim denials. Payers require explicit indication of which hip was examined, and claims lacking this information are rejected without manual review.

Another frequent error involves billing 73502 when fewer than two or more than three views were obtained. If only one view was captured, the correct code is 73501. If four or more views were necessary, 73503 must be used instead. Mismatched view counts and CPT codes constitute overcoding or undercoding, both of which violate billing regulations and trigger audits.

Diagnosis code specificity also causes denials. Generic codes such as M25.50 (pain in unspecified joint) or M79.606 (pain in unspecified leg) do not establish medical necessity for a hip-specific examination. The ICD-10 code must identify the hip joint and laterality (e.g., M25.551 for right hip pain). Payers compare the diagnosis code to the anatomical site documented in the radiology report; discrepancies result in denial for lack of medical necessity.

CPT Code 73502 NCCI Edits and Bundling Rules

The National Correct Coding Initiative (NCCI) establishes bundling rules to prevent duplicate payment for services considered part of a comprehensive procedure. CPT 73502 may bundle with evaluation and management (E/M) codes when both are performed on the same day by the same provider. In most cases, the E/M service is separately billable if it represents a significant, separately identifiable service beyond the imaging order.

Modifier 25 appended to the E/M code signals that the clinical encounter was distinct from the imaging procedure. However, if the E/M visit was solely to order the X-ray without additional evaluation, the E/M code should not be billed. Payers review documentation to verify the E/M service was medically necessary and separately identifiable. Insufficient documentation results in E/M code denials.

CPT 73502 does not typically bundle with other radiology codes unless both hips are examined. Bilateral hip imaging requires CPT 73521 or 73522 depending on the number of views per hip. Billing 73502 twice with RT and LT modifiers for bilateral imaging is incorrect and violates coding guidelines. Always verify NCCI edits and payer-specific bundling policies before submitting claims.

Prior Authorization and Coverage Policies

Prior authorization requirements for CPT code 73502 vary by payer and plan. Medicare typically does not require prior authorization for diagnostic hip X-rays, though some Medicare Advantage plans implement their own approval processes. Commercial insurers and managed care organisations frequently require pre-authorisation for non-emergent imaging to control utilisation and costs.

Facilities must verify authorization requirements with each payer before scheduling procedures. Performing services without required authorisation results in claim denials and potential patient liability for the full charge. Authorization requests should include the ICD-10 diagnosis, clinical rationale, and previous imaging results if applicable. Incomplete requests delay approvals and postpone patient care.

Some payers mandate use of specific imaging centres or require second opinions before approving non-emergent studies. Referral management systems integrated with patient portals streamline authorization workflows and reduce administrative burden. Tracking authorisation status prevents scheduling errors and ensures compliance with coverage policies.

Medicaid Coverage for CPT 73502

Medicaid coverage for CPT code 73502 varies by state. Each state Medicaid program establishes its own fee schedule, prior authorisation requirements, and coverage limitations. Some states require authorisation for all non-emergent imaging, while others allow direct access for specific indications such as trauma or acute pain.

Reimbursement rates under Medicaid are typically lower than Medicare or commercial payers. Facilities serving high volumes of Medicaid patients must understand state-specific policies to avoid unexpected denials. State Medicaid websites publish coverage determination manuals and fee schedules, though navigation can be complex. Provider relations representatives offer guidance on authorization processes and billing requirements.

Managed Medicaid plans (MCOs) introduce additional layers of coverage policies. Each MCO contracts separately with providers and may impose distinct prior authorisation requirements beyond state Medicaid regulations. Clinics must credential with individual MCOs and verify coverage for each patient based on their specific plan. This fragmentation complicates billing and increases administrative overhead.

Comparison: CPT 73502 vs. Related Hip Imaging Codes

CPT code 73502 exists within a series of hip radiography codes differentiated by the number of views performed. Understanding these distinctions prevents coding errors and ensures appropriate reimbursement. CPT 73501 represents a single-view unilateral hip examination, typically an AP view used for initial screening or follow-up. This code reimburses less than 73502 due to reduced imaging complexity and interpretation time.

CPT 73503 covers unilateral hip examinations with four or more views. This code applies when additional projections are clinically necessary, such as specialised oblique views for suspected fractures or joint pathology. Reimbursement is higher than 73502, reflecting the increased technical and professional work. Billing 73503 requires documentation justifying the medical necessity for more than three views.

Bilateral hip imaging uses different codes. CPT 73521 represents bilateral hip X-rays with a minimum of two views per hip. CPT 73522 covers bilateral hips with three or more views per hip. These codes should not be confused with bilateral modifiers (50 or bilateral anatomical modifiers), which are not used for radiology codes with specific bilateral CPT descriptors. Always select the code that accurately describes the number of views and laterality documented in the radiology report.

When to Use CPT 73502 vs. 72170

CPT code 72170 represents a pelvis X-ray with one or two views and does not specifically target the hip joint. When clinical indication centres on hip pathology and the hip joint is the primary focus of the examination, 73502 is appropriate. If the pelvis is the primary anatomical area of interest-such as evaluating pelvic fractures, bladder calculi, or bowel obstruction-72170 is the correct code.

Some clinical scenarios require both codes. For example, a trauma patient may need a pelvis X-ray (72170) to assess pelvic ring integrity and a separate hip X-ray (73502) to evaluate femoral neck alignment. In such cases, both codes are billed with appropriate modifiers indicating distinct services. Documentation must clearly differentiate the clinical indications and anatomical focus of each examination to support medical necessity.

Payers scrutinise claims billing both codes on the same date of service. The radiology report must demonstrate that each examination served a distinct clinical purpose and was not redundant. If the imaging overlaps significantly and one examination provides all necessary diagnostic information, only one code should be billed. Overcoding by billing both when clinically unnecessary constitutes fraud and exposes the facility to audits and recoupment actions.

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Conclusion

CPT code 73502 provides a standardised billing mechanism for unilateral hip X-rays with 2-3 views. Accurate code selection depends on understanding view-based distinctions, proper modifier usage, and documentation requirements. Clinics must pair the code with specific ICD-10 diagnoses, verify prior authorisation requirements, and track reimbursement rates by payer to optimise revenue cycle performance.

Common billing errors-such as omitting laterality modifiers, mismatched view counts, or insufficient documentation-lead to claim denials and delayed payments. Facilities benefit from structured reporting templates, regular audits, and integrated billing workflows that validate codes against payer policies before submission. Understanding NCCI edits, bundling rules, and payer-specific coverage policies prevents compliance violations and reduces audit risk.

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