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    v1.0.28
    OpenPayerBilling CodesContinuous External Electrocardiographic Recording ProceduresCPT cpt-0939t-long-term-ambulatory-ecg-data-analysis-15-30-days
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    CPT 0939T: External Ambulatory ECG Monitoring, >15–30 Days

    CPT code 0939T describes a clinician’s interpretation and report of data captured from an external ambulatory electrocardiographic monitor worn continuously for more than 15 days and up to 30 days; service type: extended ambulatory rhythm monitoring with data analysis and report generation; typical site of service: outpatient clinic or remote monitoring service where recorded device data are received and analyzed.

    For related coverage guidance, see recent payer policy updates: Cardiac Computed Tomography (CCT)/Coronary Computed Tomographic Angiography (CCTA), Cardiovascular Disease Risk Assessment, Biomarkers for Myocardial Infarction and Chronic Heart Failure.

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    Clinical & Coding Specifications

    Clinical Context

    A 68-year-old patient with intermittent palpitations, near-syncope, or unexplained episodic lightheadedness is referred by their primary care physician or cardiologist for ambulatory rhythm monitoring. The patient is fitted with an external continuous ambulatory electrocardiographic monitor that records cardiac rhythm continuously for more than 15 days and up to 30 days. After the monitoring period, the device data are returned to the clinic or monitoring service. The provider downloads, scans, and analyzes the recorded electrocardiographic traces, correlates rhythm events with patient symptom logs or device-detected events, and generates a physician report summarizing findings such as atrial fibrillation, frequent premature ventricular complexes, pauses, or sustained arrhythmias. Typical workflow steps: device placement and patient instruction (clinic or outpatient device-supply location), remote or in-person device return at end of wear period, data ingestion and automated algorithms review, manual physician over-read and annotation, correlation with clinical history and symptoms, and final report generation transmitted to the referring clinician. Typical sites of service include outpatient cardiology clinics, ambulatory monitoring centers, and patient homes for device wear with remote data transmission.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    93226External electrocardiographic recording up to 48 hours by continuous rhythm recording and storage with storage device; analysis and reportShorter-duration ambulatory monitoring option often used prior to or instead of longer-term monitoring.
    93227External electrocardiographic recording up to 48 hours by continuous rhythm recording and storage with storage device; recording only, review and interpretation by physician not includedTechnical counterpart to short-term monitoring; may be performed by monitoring vendor before physician analysis.
    93224External electrocardiographic recording up to 48 hours; recording only, review and interpretation not includedAnother short-term recording code relevant to ambulatory rhythm evaluation workflows.
    93243External ambulatory electrocardiographic monitoring with scanning analysis up to 48 hours; physician review and interpretationExample of physician analysis/reporting for shorter monitoring periods; analogous workflow to 0939T but for shorter duration.
    93268Continuous rhythm monitoring using a subcutaneous single lead electrode; analysis and reportImplantable or long-term continuous monitoring modalities that may be considered if extended external monitoring is inconclusive.
    99457Remote physiologic monitoring treatment management services, 20 minutes or more of clinical staff/physician/other qualified healthcare professional time in a calendar month requiring interactive communication with the patient/caregiverComplementary remote monitoring management services that may be billed in conjunction with ambulatory ECG monitoring when ongoing remote management is provided.

    Related Modifiers

    8 rows

    ModifierDescriptionWhen to Use
    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…
    51Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…
    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…
    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…
    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…
    95Modifier 95 indicates that a service was provided via synchronous, real‑time audio‑video telehealth rather than in‑person. Per CMS, AAPC and professional associations, append modifier 95 to claim…- Use modifier 95 to indicate a service was furnished via synchronous, real‑time audiovisual telehealth (a live audio‑video conference between patient and provider) rather than in‑person. - Pair…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    207RC0000XCardiovascular Disease PhysicianAn internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threaten…
    207Q00000XFamily Medicine PhysicianFamily Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadt…
    261QP3300XPain Clinic/CenterAmbulatory Health Care Facilities · Clinic/Center
    202C00000XIndependent Medical Examiner PhysicianA special evaluator not involved with the medical care of the individual examinee that impartially evaluates the care being provided by other practiti…
    207RN0300XNephrology PhysicianAn internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not fu…
    2084F0202XForensic Psychiatry PhysicianForensic Psychiatry is a subspecialty with psychiatric focus on interrelationships with civil, criminal and administrative law, evaluation and special…
    103TE1000XDeactivated - Psychologist
    207QA0000XAdolescent Medicine (Family Medicine) PhysicianA family medicine physician with multidisciplinary training in the unique physical, psychological and social characteristics of adolescents and their …

    Related Payer Policy Updates

    Specialty: Cardiology1 / 3

    6 rows

    PolicyPayerEffective Date
    Cardiac Computed Tomography (CCT)/Coronary Computed Tomographic Angiography (CCTA)univerahealthcare2026-10-15
    Cardiovascular Disease Risk AssessmentOscar Health2026-10-01
    Biomarkers for Myocardial Infarction and Chronic Heart FailureOscar Health2026-10-01
    Multiple Procedure Payment Reduction for Diagnostic Cardiovascular ProceduresBlue Cross Blue Shield - Maine2026-10-01
    Cardiovascular Disease Risk Assessmentblue cross blue shield - louisiana2026-09-15
    Cardiovascular Disease Risk AssessmentBlue Cross Blue Shield - New Mexico2026-09-04

    Related Codes

    CPT-0937T-EXTENDED-EXTERNAL-AMBULATORY-CARDIAC-MONITORING-15-30-DAYS

    CPT 0937T: Extended External Ambulatory Cardiac Rhythm Monitoring (>15–30 days)

    CPT-0938T-EXTENDED-AMBULATORY-CARDIAC-RHYTHM-MONITORING-15-30-DAYS

    CPT 0938T: Continuous External Heart Rhythm Monitoring Setup (15–30 Days)

    CPT-0940T-PROLONGED-AMBULATORY-ECG-15-TO-30-DAYS-INTERPRETATION

    CPT 0940T: External ECG Monitoring Interpretation for 15–30 Days

    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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