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    v1.0.30
    OpenPayerBilling CodesBone/Joint StudiesCPT cpt-77073-lower-extremity-leg-length-measurement
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    CPT 77073: Lower Extremity Imaging for Leg Length Measurement

    Medicare pays $32 on average nationally for this procedure.

    CPT code 77073 describes radiographic imaging of the lower extremities from hips to ankles to measure leg length discrepancy; this service is a diagnostic imaging study performed to assess limb-length inequality and is typically provided as an outpatient radiology procedure in an imaging center or hospital radiology department.

    For related coverage guidance, see recent payer policy updates: Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM), Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®), Lumbar Microdiscectomy.

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    Clinical & Coding Specifications

    Clinical Context

    A 14-year-old adolescent presents to an orthopedic imaging center with a history of leg-length discrepancy noted by the pediatrician and asymmetric gait. The clinical workflow begins with an orthopedic evaluation documenting limb-length concerns, physical examination including block testing, and an order for radiographic limb-length measurement from hips to ankles. The imaging technologist positions the patient supine or standing depending on protocol, includes calibration markers, and acquires full-length anteroposterior images of both lower extremities from the iliac crests/hip joints through the ankles. The radiologist reviews measurements, compares femoral and tibial segment lengths, documents side-to-side differences, and issues a formal report for the referring orthopedic surgeon. Results may inform management such as shoe lifts, physical therapy, epiphysiodesis planning, or preoperative templating for corrective procedures.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77073Radiographic limb-length study, hips to anklesPrimary procedure to measure lower extremity length difference.
    73560Radiologic examination, femur, unilateral, minimum 2 viewsMay be used when focused imaging of femoral segment is required in addition to full-length study.
    73561Radiologic examination, femur, bilateral, minimum 2 viewsUsed when bilateral femur series are needed for segmental comparison beyond full-length imaging.
    73600Radiologic examination, tibia and fibula, unilateral; complete, minimum 2 viewsUsed when focused tibial imaging is performed for further evaluation of tibial contribution to discrepancy.
    72192Radiologic exam, pelvis, single view, frontalPelvic radiographs may be obtained adjunctively to assess hip joint pathology contributing to apparent limb-length discrepancy.
    76000Fluoroscopy (if applicable)Occasionally used intraoperatively or for dynamic assessment in planning procedures following radiographic measurement.

    Related Modifiers

    8 rows

    ModifierDescriptionWhen to Use
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RC0000X
    207L00000X
    208000000X
    2084P0800X
    246ZS0410X
    207XS0114X
    207VM0101X
    111NN0400X

    Related Payer Policy Updates

    Specialty: Neurology/Neurosurgery1 / 3

    10 rows

    PolicyPayerEffective Date
    Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM)Kaiser Permanente2027-01-01
    Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®)bcbsvermont2026-11-01
    Lumbar Microdiscectomyuniverahealthcare2026-10-15
    Artificial Cervical Intervertebral Discuniverahealthcare2026-10-15
    Lumbar Decompressionuniverahealthcare2026-10-15
    Responsive Neurostimulation for Focal EpilepsyPremera Bluecross2026-10-14
    Intraoperative MonitoringProvidence Health Plan2026-10-01
    Intraoperative MonitoringProvidence Health Plan2026-10-01
    High-Intensity Focused UltrasoundMass General Brigham Health Plan2026-10-01
    Vagal Nerve StimulationAmbetter Nevada2026-10-01

    Related Codes

    CPT-77071-JOINT-RADIOGRAPHIC-STRESS-VIEWS

    CPT 77071: Stress Radiographic Views of a Joint

    CPT-77072-SKELETAL-MATURITY-XRAY-HAND-WRIST

    CPT 77072: Skeletal Maturity (Bone Age) X‑ray

    CPT-77074-SKELETAL-RADIOGRAPHIC-SERIES-EVALUATION-OF-METASTATIC-DISEASE

    CPT 77074: Skeletal Survey for Evaluation of Bone Disease

    CPT-77075-WHOLE-BODY-SKELETAL-RADIOGRAPHY

    CPT 77075: Skeletal Survey for Metastatic Evaluation

    CPT-77076-INFANT-SKELETAL-XRAY

    CPT 77076: Infant Skeletal Radiography

    CPT-77077-JOINT-SURVEY-SINGLE-VIEW-PER-JOINT

    CPT 77077: Joint Survey, Single View per Joint

    CPT-77078-CT-BONE-DENSITY-AND-STRUCTURE-STUDY

    CPT 77078: CT Bone Density and Bone Mass Assessment

    CPT-77080-DXA-BONE-DENSITY-TRUNK

    CPT 77080: DXA Trunk Bone Mineral Density Measurement

    CPT-77081-DUAL-ENERGY-DXA-BONE-MINERAL-DENSITY

    CPT 77081: Dual Energy X‑Ray Absorptiometry (DXA) for BMD

    CPT-77084-MRI-BONE-MARROW-PERFUSION-EVALUATION

    CPT 77084: MRI Evaluation of Bone Marrow Perfusion

    Showing 1–10 of 16

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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