Coding the CMAT Encounter: 3 CPT Codes From One Multi-System Test

When a CMAT Advantage encounter is clinically indicated for a symptomatic or at-risk patient, a single 15-minute test captures three clinically distinct measurements — vascular (ABI with pulse-volume recording), cardiovagal autonomic (heart-rate variability), and sudomotor function. Each corresponds to a separate CPT code — 93923, 95921, and 95923 — that may be billable under established CPT codes when the testing is medically necessary and documented, with coverage varying by payer. This guide explains what each code documents and, just as importantly, how to document medical necessity for each one so the encounter is defensible on audit.

What a CMAT Encounter Measures and How It Maps to Three CPT Codes

Point-of-care testing lets independent clinics evaluate vascular and autonomic function in patients who present with symptoms or documented risk factors, supporting earlier clinical decisions during the office visit. CMAT Advantage—the flagship CMAT device from HealthWright Technologies—combines three well-established cardiovascular and neurologic measurements into a single 15-minute protocol:

One device, one staff member, one visit — three clinically distinct measurements, each separately coded when medically necessary.

Which CPT Codes Does a CMAT Encounter Support?

The protocol pairs one vascular code with two autonomic codes, each tied to a clinically distinct measurement. Understanding what each code documents is the foundation of defensible billing.

Reimbursement for each code varies by payer, plan, and geographic region, so practices should always verify current coverage and allowable amounts with each payer and their billing department before submitting claims. Because the three codes correspond to separate diagnostic modalities, an appropriately documented CMAT encounter can support all three on a single date of service when each is medically necessary. Multiple acquisition options are available, including lease and flexible payment plans—contact HealthWright Technologies to discuss terms that fit your practice.

Clinical Depth Without Workflow Drag

Added chair time: approximately 3 minutes beyond routine vitals.

Five Clinical Benefits of Multi-System CMAT Testing

1. Earlier PAD Identification. PVR waveform analysis offsets false-negatives common in calcified diabetic vessels, supporting earlier intervention that may help reduce downstream amputations and hospitalizations.
2. Objective Autonomic Data. HRV and sudomotor measurements can surface clinically silent autonomic dysfunction, supporting tighter glycemic or medication management.
3. Quality-Measure Support. Objective data feed MIPS and value-based contracts, bolstering quality scores.
4. Audit-Defensible Documentation. Each modality generates a stored, time-stamped report that ties an objective measurement to the physician’s interpretation — the documentation payers expect to see.
5. Data-Driven Patient Education. Color-coded reports simplify risk conversations and improve adherence to lifestyle or therapy changes.

How Should Practices Document Medical Necessity for Each Code?

Because 93923, 95921, and 95923 each describe a distinct diagnostic test, payers expect the chart to show an independent indication and interpretation for each one. The strongest documentation links every code to a specific risk factor or symptom: the vascular study (93923) to claudication, diminished pulses, non-healing wounds, or diabetes with PAD risk; the heart-rate-variability study (95921) to suspected cardiovascular autonomic neuropathy; and the sudomotor study (95923) to symptoms of small-fiber neuropathy such as burning feet, numbness, or abnormal sweating.

A defensible CMAT encounter therefore includes the ordering rationale, the device-generated report stored in the chart, and a physician interpretation note for each modality. Practices should also confirm payer-specific frequency limits and any required diagnosis codes before the visit. For a deeper look at how individual tests are coded, see our guides to the ankle-brachial index CPT code and the autonomic function testing CPT code. Correct coding and medical-necessity determinations remain the responsibility of the treating provider and their billing team.

Which Patients Are the Strongest Candidates for CMAT Testing?

Not every patient requires the full three-test protocol, and identifying the patients for whom testing is clinically indicated keeps both clinical impact and documentation defensible. The strongest candidates for ABI testing combined with autonomic function assessment and sudomotor testing fall into several clearly defined categories.

Diabetic patients with disease duration exceeding five years represent a primary candidate population. These patients carry an elevated risk of undiagnosed peripheral artery disease and autonomic neuropathy — conditions that can progress silently until complications like non-healing wounds, falls, or cardiac events occur. Identifying these conditions in patients with risk factors allows physicians to intervene with targeted management before irreversible damage develops. In patients whose ankle vessels are heavily calcified, a toe-brachial index can add diagnostic clarity when the standard ABI is unreliable.

Patients with multiple cardiovascular risk factors — hypertension, hyperlipidemia, smoking history, family history of vascular disease — benefit from the comprehensive risk stratification that the three-test protocol provides. While individual risk factors are commonly managed, the combination of vascular and autonomic data reveals cumulative cardiovascular burden that standard lab work and physical examination may underestimate. This is especially relevant where diabetes overlaps with suspected cardiovascular autonomic neuropathy.

Patients presenting with non-specific symptoms like fatigue, dizziness, exercise intolerance, or leg discomfort often undergo extensive workups before vascular or autonomic causes are considered. The CMAT protocol can help identify or rule out peripheral vascular compromise and autonomic dysfunction in a single 15-minute visit, potentially shortening the diagnostic journey and reducing unnecessary specialist referrals.

For practices introducing the protocol, starting with a defined cohort of clearly indicated patients builds staff confidence, establishes documentation patterns with key payers, and generates clinical outcome data that supports broader use.

Built-In Compliance & Support from HealthWright

All included with HealthWright Technologies medical devices—no hidden SaaS fees or “premium” tiers.

How Do You Address Common Questions About Adding CMAT?

Decision Checklist for Clinic Owners & Medical Directors

☐ Validate payer coverage for 93923, 95921, 95923
☐ Confirm medical-necessity criteria and documentation for each code
☐ Choose a financing or flexible payment pathway
☐ Identify a clinic champion and schedule 90-minute training
☐ Plan a go-live date (2–4 weeks typical)

Getting Started With Multi-System CMAT Testing

The CMAT Advantage program from HealthWright Technologies bundles the device, staff training, billing guidance, and ongoing clinical support into a single solution. Most practices achieve staff competency within a 90-minute MA certification session, and the automated testing protocol ensures consistent, reproducible results regardless of operator experience level.

For practices already performing standalone PAD testing or standard ABI testing, the multi-system CMAT protocol is a straightforward addition — the same clinically indicated encounter that currently documents one measurement can document three distinct measurements, each separately coded when medically necessary, with minimal additional chair time and no additional equipment beyond the CMAT device.

Related HealthWright resources

• Autonomic function testing CPT codes
• CMAT Advantage system overview
• Partner with HealthWright Technologies
• Contact our team for a practice assessment

Frequently Asked Questions

How many CPT codes can a single CMAT device encounter support?

A single CMAT Advantage encounter can support three clinically distinct CPT codes when each is medically necessary and documented: 93923 for non-invasive vascular studies (ABI + pulse-volume recording), 95921 for autonomic function testing (heart-rate-variability analysis), and 95923 for sudomotor function testing. All three tests run automatically in one 15-minute session with a single set of sensor placements. Coverage varies by payer.

How much time does multi-system CMAT testing add to a patient visit?

The CMAT Advantage protocol adds approximately 3 minutes of physician time beyond routine vitals. A medical assistant applies the cuffs and sensors in about 2 minutes, the device auto-runs all three tests in 5 minutes, and the physician reviews the color-coded results in about 1 minute. Total added staff time is approximately 8 minutes.

Does billing multiple CPT codes from one device visit create compliance risk?

Each of the three CPT codes (93923, 95921, 95923) represents a clinically distinct diagnostic test — vascular assessment, autonomic function, and sudomotor function — performed with different measurement modalities. The key safeguard is documenting an independent medical indication and a physician interpretation for each test, and verifying payer-specific policies before billing. Correct coding and medical-necessity determinations remain the responsibility of the treating provider.

Is the CMAT Advantage device FDA-cleared?

The CMAT Advantage system is built on FDA-cleared component devices (including the 510(k)-cleared ABI module) for non-invasive vascular and autonomic measurement. There is no single integrated “CMAT Advantage” clearance; clearances apply to the underlying component devices. The system provides objective measurements for physician interpretation and does not itself render a diagnosis.

Conclusion

For a clinically indicated patient, the CMAT Advantage turns a single office visit into a multi-system cardiovascular and autonomic evaluation that supports earlier clinical decisions. For independent practices, this single CMAT device offers faster multi-system measurement, three clinically distinct tests each tied to an established CPT code, and minimal workflow disruption — with the documentation discipline that keeps the encounter defensible.

Billing these codes assumes the rendering provider is already credentialed with each payer, so confirm enrollments are active before the first claim goes out. This physician credentialing checklist outlines the steps that prevent avoidable denials.

Ready to get started? Learn how HealthWright Advantage bundles the device, training, and ongoing support your practice needs — backed by a 90-day buyback guarantee. Or contact HealthWright Technologies to see how the CMAT Advantage program supports multi-system testing from one device visit. Questions? Email contact@healthwrighttechnologies.com or call (678) 322-7146.

CPT codes are provided for informational purposes only and do not guarantee reimbursement. Verify code applicability and coverage with the relevant payer and your billing department before submitting claims. CPT® is a registered trademark of the American Medical Association.

References

• Peripheral Artery Disease — NHLBI, NIH
• 2024 ACC/AHA Lower Extremity PAD Guideline (ABI clinical utility) — Circulation, via PubMed

Related Articles

• Why Non-Invasive Cardiovascular Diagnostics With CMAT Advantage Are the Future of Primary Care
• PAD Testing With the CMAT Advantage System for Independent Practices
• How PAD Testing Helps Independent Practices Evaluate Vascular Disease Early
• Autonomic Testing and Hypertension Control: TM-Flow System in Action