CPT 93644Cardiology

Ep eval subq impl dfb

CPT code 93644 covers the evaluation and testing of a subcutaneous implantable cardioverter-defibrillator (S-ICD), a device placed under the skin to monitor and correct dangerous heart rhythms without leads going into the heart.

Showing rates for

National Average

Base Medicare rate

$183.08

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

3.04

PE RVU (NF)

2.53

MP RVU

0.09

Total RVU

5.66

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Verify S-ICD system type before billing; CPT 93644 is specific to subcutaneous ICDs, not traditional transvenous ICDs (which use 93289, 93295, or 93296)
Impact: Prevents denials due to incorrect code selection; wrong code could result in $100+ payment difference or complete claim rejection
Document all components: device interrogation, stored data review, sensing assessment, detection evaluation, and any shock testing performed
Impact: Complete documentation supports medical necessity and reduces audit risk; missing elements can trigger recoupment of full $183.08 payment
Bill globally (without modifiers) when both technical and professional components are performed by the same entity in the same setting
Impact: Ensures full $183.08 reimbursement; splitting components unnecessarily reduces total payment by 10-15%
Do not bill 93644 with remote monitoring codes (93298) on the same date of service; these represent different monitoring modalities
Impact: Prevents bundling denials and potential recovery actions; codes are mutually exclusive per NCCI edits
Ensure medical necessity is documented for frequency of evaluations; Medicare typically covers routine checks every 90 days minimum
Impact: More frequent evaluations require symptom-based justification to avoid denials; denied claims lose full $183.08 payment
Verify device manufacturer and model in documentation matches S-ICD systems; currently limited to specific approved devices
Impact: Auditors verify device type against implant records; mismatched documentation can trigger denials and potential fraud investigation

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 93644 in 2025?

The 2025 Medicare national average reimbursement for CPT 93644 is $183.08 for both facility and non-facility settings. This is based on 5.66 total RVUs multiplied by the 2025 conversion factor of 32.3465.

What is the difference between CPT 93644 and 93289 for ICD checks?

CPT 93644 is specifically for subcutaneous implantable defibrillators (S-ICD) that have leads placed under the skin but outside the heart. CPT 93289 is for single-chamber transvenous ICDs with leads inside the heart chambers. Using the wrong code will result in claim denial.

How often can CPT 93644 be billed for routine S-ICD evaluations?

Medicare typically allows routine in-person S-ICD evaluations at minimum 90-day intervals. More frequent evaluations require documentation of medical necessity such as symptoms, device alerts, shock delivery, or clinical status changes.

Can CPT 93644 be billed with an E/M code on the same day?

Yes, but the E/M service must be separately identifiable and significant beyond the device evaluation. Append modifier 25 to the E/M code and document a distinct problem or evaluation that warranted the additional service.

What are the work RVUs for CPT code 93644?

CPT 93644 has 3.04 work RVUs, 2.53 practice expense RVUs (both facility and non-facility), and 0.09 malpractice RVUs, totaling 5.66 RVUs for 2025.

Does CPT 93644 require a physician to perform the service?

The device interrogation can be performed by a certified device technician, but a physician or qualified non-physician practitioner must provide direct supervision and perform the interpretation and clinical assessment to bill the service.

What documentation is needed to support medical necessity for CPT 93644?

Documentation must include device interrogation printout with all parameters, physician interpretation noting battery status, sensing function, therapy history, any programming changes, correlation with patient symptoms, and clinical assessment. The note must be signed and dated by the interpreting physician.