CurrentKaiser PermanentePolicy N/A

Carotid Intima Media Thickness (IMT or CIMT) for Coronary Artery Disease Screening and Monitoring

Defines Kaiser Permanente Washington coverage stance and clinical review criteria for carotid intima-media thickness (IMT/CIMT) when used to screen for or monitor coronary artery disease; applies to KP Washington members and providers.

Policy Summary

PayerKaiser Permanente

PolicyCarotid Intima Media Thickness (IMT or CIMT) for Coronary Artery Disease Screening and Monitoring

Policy CodePolicy N/A

Change TypeNo material change

Effective DateN/A

Next Review DateMay 5, 2026

Key ActionWhen requesting review, include the last 6 months of clinical notes from the requesting provider and/or specialist.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

214articles identified in literature search

0.02-0.05estimated annual IMT progression

>1.2 mmplaque threshold

93895CPT considered not medically necessary

Coverage Criteria

Medical necessity — screening and monitoring

Covered when ALL of the following are met

Overall evidence-based stance: There is insufficient evidence that carotid IMT is as safe or provides better long-term outcomes than standard services for screening or monitoring CAD; measuring carotid IMT and treating based on it has not been shown to reduce CVD risk and does not meet Kaiser Permanente Medical Technology Assessment Criteria.

Source: MTAC evidence summary and policy conclusion

Use of carotid intima-media thickness (IMT) to evaluate risk for cardiovascular disease (CVD) or to monitor the treatment effect on coronary artery disease (CAD) does not meet Kaiser Permanente Medical Technology Assessment Criteria. Although studies show an association between carotid IMT and coronary events, there is insufficient evidence that measuring carotid IMT or treating patients based on IMT measurements reduces CVD risk or provides additive value beyond established global risk assessment strategies.

Quantitative carotid intima media thickness and carotid atheroma evaluation, bilateral (CPT 93895) is considered Not Medically Necessary.

Coding and Thresholds

Policy Summary

PayerKaiser Permanente

PolicyCarotid Intima Media Thickness (IMT or CIMT) for Coronary Artery Disease Screening and Monitoring

Policy CodePolicy N/A

Change TypeNo material change

Effective DateN/A

Next Review DateMay 5, 2026

Key ActionWhen requesting review, include the last 6 months of clinical notes from the requesting provider and/or specialist.

SourceLink

On This Page

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Provider Actions and Billing

Prior Authorization

Prior Authorization / Denial Risk

Prior authorization may be required for vascular imaging services. CPT 93895 (Quantitative carotid intima media thickness and carotid atheroma evaluation, bilateral) is identified as Considered Not Medically Necessary — submitting a prior authorization does not guarantee payment and claims for this code are at risk for denial.

Affected code: CPT 93895 — Considered Not Medically Necessary

Denial Risk

Denied Procedure / Denial Risk

CPT 93895 is listed as Considered Not Medically Necessary for carotid IMT/CIMT. Submitters should be aware that use of this code may result in claim denial; confirm coverage via the member’s Evidence of Coverage and the Pre-authorization Code Check before scheduling.

Denied/Not medically necessary code: 93895

Documentation Required

Required Documentation for Review

When requesting review for this service, include the last 6 months of clinical notes from the requesting provider and/or specialist to support clinical necessity.

Include: Last 6 months of clinical notes from requesting provider and/or specialist

Note

Provider Actions

Provider action: verify member coverage and authorization requirements prior to performing CIMT; if submitting for review, attach the last six months of clinical documentation. Use the Pre-authorization Code Check tool to confirm plan-specific prior authorization rules.

Action: Verify coverage and prior authorization via Pre-authorization Code Check
Action: Attach last 6 months of clinical notes when requesting review

Background

Atherosclerosis progresses with arterial wall thickening and plaque formation; carotid IMT uses high-resolution B-mode ultrasound to measure the combined distance between the lumen–intima and media–adventitia interfaces as a surrogate marker of arterial wall disease. IMT can be measured at multiple carotid segments, and measurement methods, cutoffs, and inter-reader variability differ across studies, limiting its utility as a standardized screening or monitoring tool.

Clinical trials have used carotid IMT as an intermediate or surrogate endpoint (for example, the LIPID substudy demonstrated regression of common carotid IMT with pravastatin), but changes in IMT have not been conclusively linked to reductions in cardiovascular events. As a result, IMT measurements are considered investigational for routine risk stratification or to guide therapy for CAD.

Definitions

Carotid IMT (CIMT) definition — ultrasound measurement

DefinitionCarotid artery intima-media thickness (IMT/CIMT) is the high-resolution ultrasound measurement of the distance between the lumen–intima interface and the media–adventitia interface, reflecting arterial wall characteristics

Anatomic sites measuredMeasured at posterior aspect of the common carotid artery, anterior wall of the internal carotid artery, or at the common carotid artery bifurcation

Measurement approachesCan be calculated as the average arterial wall thickness, the maximal measured value, or the average of maximal values of different segments

Imaging limitationUltrasound cannot discriminate true intima from media and thus measures the combined intima–media complex

Segment selection noteResearchers differ on which wall or segment to image; imaging multiple segments may provide more relevant information due to asymmetric atherosclerosis