Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ZACHARY T HOLLIS M.D.
NPI 1104142744
Internal Medicine - Clinical Cardiac Electrophysiology in Fairfax, VA

Q: What is Zachary Hollis's NPI number?

The NPI number for Zachary Hollis is 1104142744. It was assigned to this individual provider in the NPPES registry on April 7, 2010.

Q: What is Zachary Hollis's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Clinical Cardiac Electrophysiology, with taxonomy code 207RC0001X.

Q: When was this NPI record last updated?

The NPPES record for Zachary Hollis was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since April 07, 2010PECOS EnrolledAccepts Medicare Assignment

8081 INNOVATION PARK DR STE 602, FAIRFAX, VA 22031(571) 472-3270(571) 472-3271 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 29, 2026, Mar 4, 2026, Nov 23, 2021 and 5 more (8 updates tracked since 2018).

On this page

About Zachary T Hollis M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ZACHARY T HOLLIS M.D. (NPI 1104142744) is an individual clinical cardiac electrophysiology provider in Fairfax, Virginia, licensed in Virginia (0101265236) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS, is affiliated with Inova Alexandria Hospital, and maintains 10 additional practice locations.

NPPES Registry Identity

NPI1104142744

Entity TypeIndividualMale

Primary Taxonomy207RC0001X

Provider Legal NameZACHARY T HOLLISCredential: M.D.

Location Address8081 INNOVATION PARK DR STE 602Fairfax, VA 22031-4867

Mailing Address104 Selma DrWinchester, VA 22601-3834 · (703) 776-4001 · Fax (703) 776-2338

Phone(571) 472-3270

Fax(571) 472-3271

Sole ProprietorNo

Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 2010

Enumeration DateApril 7, 2010

Last NPPES UpdateSeptember 29, 20268 updates tracked since enumeration

NPPES CertifiedSeptember 29, 2026

✔ NPI 1104142744 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Clinical Cardiac ElectrophysiologyAllopathic & Osteopathic Physicians

Taxonomy Code207RC0001X

License✔ Licensed in VA · 0101265236

Definition

A field of special interest within the subspecialty of cardiovascular disease, specialty of Internal Medicine, which involves intricate technical procedures to evaluate heart rhythms and determine appropriate treatment for them.

Also ListedInternal MedicineTaxonomy 207R00000X · License 0101265236 (VA)

Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X · License 0101265236 (VA)

8081 INNOVATION PARK DR STE 602, Fairfax, VA 22031

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Secondary Practice Locations 10

Location 1224D Cornwall St NW Ste 306Leesburg, VA 20176-2704 · Phone (571) 472-3270 · Fax (571) 472-3271

Location 23300 Gallows RdFalls Church, VA 22042-3307 · Phone (703) 776-4001 · Fax (703) 776-7113

Location 344045 Riverside PkwyLeesburg, VA 20176-5101 · Phone (703) 858-6000 · Fax (703) 858-6900

Location 4104 Selma DrWinchester, VA 22601-3834 · Phone (540) 678-2800

Location 54320 Seminary RdAlexandria, VA 22304-1535 · Phone (703) 504-3000 · Fax (703) 504-3388

Location 6351 Valley Health Way # 200Front Royal, VA 22630-6480 · Phone (540) 636-0600 · Fax (540) 636-0629

Location 7190 Campus Blvd Ste 201Winchester, VA 22601 · Phone (540) 662-0306 · Fax (855) 264-2066

Location 844084 Riverside PkwyLeesburg, VA 20176-8279 · Phone (571) 472-3270 · Fax (571) 472-3271

Location 93025 Hamaker Ct Ste 101Fairfax, VA 22031-2229 · Phone (571) 472-3270 · Fax (571) 472-3271

Location 1021785 Filigree Ct Ste 203Ashburn, VA 20147-6214 · Phone (571) 472-3270 · Fax (571) 472-3271

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource, Highmark Blue Cross Blue Shield West Virginia, Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Zachary T Hollis M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1951535848

PECOS Enrollment IDI20181001000904, I20211008000465

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Zachary Hollis reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Inova Health Care Services

0.3 mi

Internal Medicine

3300 GALLOWS RD, PHYSICIAN SERVICES
Falls Church, VA 22042

Reassigned Medicare billing, District of Columbia and Virginia enrollments
Also billed through NPI 1588717755 (Virginia)
18 clinicians in this Medicare group

NPI 1952320061 (703) 321-2627

Valley Physician Enterprise, Inc.

45 mi

Family Medicine

115 SOUTH CHURCH STREET
Berryville, VA 22611

Reassigned Medicare billing, Virginia enrollment
386 clinicians in this Medicare group

NPI 1700562634 (540) 955-4811

Warren Memorial Hospital, Inc.

50 mi

Emergency Medicine

351 VALLEY HEALTH WAY
Front Royal, VA 22630

Reassigned Medicare billing, Virginia enrollment
367 clinicians in this Medicare group

NPI 1164442281 (540) 636-0300

Page Memorial Hospital, Inc.

53 mi

Rural Health

625 VIRGINIA AVE
Front Royal, VA 22630

Reassigned Medicare billing, Virginia enrollment
364 clinicians in this Medicare group

NPI 1083236970 (540) 635-7991

Winchester Medical Center

53 mi

Family Medicine

217 GROCERY AVENUE, SUITE B
Winchester, VA 22602

Reassigned Medicare billing, Virginia enrollment
756 clinicians in this Medicare group

NPI 1689463671 (540) 536-7700

Selma Medical Assoc Inc

56 mi

Internal Medicine

104 SELMA DR
Winchester, VA 22601

Reassigned Medicare billing, Virginia enrollment
23 clinicians in this Medicare group

NPI 1144325721 (540) 678-2800

Shenandoah Memorial Hospital, Inc.

61 mi

Family Medicine

33699 OLD VALLEY PIKE STE D
Strasburg, VA 22657

Reassigned Medicare billing, Virginia enrollment
416 clinicians in this Medicare group

NPI 1710494331 (540) 459-1410

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 29

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days 93296

This procedure involves remotely monitoring your pacemaker or implantable defibrillator system. Over a 90-day period, we check the device's performance and your heart's activity. This helps ensure the device is functioning properly and providing the best possible support for your heart health.

974 services811 patients

Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days 93294

This procedure evaluates your pacemaker system remotely for up to 90 days. It checks whether single, dual, multiple lead, or leadless pacemakers are working properly. It's a safe, convenient way to ensure your heart device is functioning optimally.

705 services593 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

449 services349 patients

Evaluation of cardiac rhythm monitor system, remote up to 30 days 93298

This procedure involves remotely monitoring your heart rhythm for up to 30 days. A small device will record your heart's activity, which can be accessed by your healthcare team. This aids in diagnosing any irregularities or issues with your heart function.

323 services155 patients

Evaluation of single, dual, or multiple lead implantable defibrillator system, remote up to 90 days 93295

This procedure involves remotely monitoring your implantable defibrillator system, which can have single, dual, or multiple leads. Over a period of up to 90 days, the system's performance is evaluated to ensure it's working properly and providing the necessary heart rhythm support.

271 services219 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

265 services246 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

184 services159 patients

Programming of dual lead pacemaker system 93280

Programming of a dual lead pacemaker system is a procedure to adjust your heart's pacemaker settings. This process involves a small device, called a programmer, that communicates with your pacemaker to ensure it's working optimally for your heart's needs.

82 services80 patients

Evaluation of single, dual, multiple lead or leadless pacemaker system 93288

An evaluation of a pacemaker system examines how well your heart device is working. Single, dual, multiple lead, or leadless refers to the wires that deliver electrical pulses from the pacemaker to your heart. This check ensures your heart is receiving the right amount of support from the device.

81 services75 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

75 services67 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

64 services64 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

59 services42 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

55 services55 patients

Comprehensive electrophysiologic evaluation with catheter destruction of abnormality causing atrial fibrillation (uncoordinated contraction of upper chambers of heart) by pulmonary vein isolation 93656

This is a procedure to treat atrial fibrillation, a condition causing irregular heartbeats. It involves a detailed heart evaluation using electrophysiology. A catheter is then used to destroy the problematic area causing the issue. Specifically, isolation of the pulmonary vein is done to regulate the heartbeat.

51 services49 patients

Destruction of tissue of upper heart chamber through tube to treat abnormal heart rhythm 93657

This procedure involves using a tube, or catheter, to access your upper heart chamber. Special tools are then used to destroy a small area of heart tissue causing abnormal rhythm. This helps reset your heart's regular rhythm, improving heart function.

42 services25 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

39 services38 patients

Evaluation of single, dual, or multiple lead implantable defibrillator system 93289

This procedure evaluates your implantable defibrillator system, which helps regulate your heart rhythm. It can involve single, dual, or multiple lead systems. It's essential to ensure the device is working correctly and adjusting to your heart's needs.

34 services24 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

34 services34 patients

Insertion of pacemaker and upper and lower heart chamber electrode 33208

A pacemaker insertion is a procedure where a small device, called a pacemaker, is implanted under your skin. This device uses electrical pulses to prompt the heart to beat at a normal rate. Electrodes are placed in the upper and lower chambers of your heart to help regulate your heartbeat.

32 services32 patients

Insertion of catheters and destruction of tissue to treat abnormal heart rhythm 93655

This procedure involves placing small tubes (catheters) into your heart via a blood vessel. These catheters emit energy that corrects irregular heartbeats by eliminating the problematic heart tissue. It's a common, minimally invasive method to treat abnormal heart rhythms.

26 services21 patients

Electrocardiogram (ecg) up to 30 days continuous with review and report by health care professional 93228

An Electrocardiogram (ECG) is a non-invasive test that records the electrical signals in your heart. For up to 30 days, a small device will continuously monitor your heart's activity. A healthcare professional will then review the data and provide a report on your heart's function.

25 services25 patients

Programming of single lead pacemaker system 93279

Programming of a single lead pacemaker system involves adjusting the pacemaker's settings to suit your heart's unique needs. This is done using a special device that communicates with the pacemaker, ensuring it helps your heart beat at an optimal rate.

23 services20 patients

Programming of multiple lead implantable defibrillator system 93284

Programming of a multiple lead implantable defibrillator system involves adjusting settings on your implanted device to help control irregular heart rhythms. The process is non-invasive and helps ensure optimal device performance for maintaining heart health.

23 services23 patients

Evaluation of cardiac rhythm monitor system 93291

The evaluation of a cardiac rhythm monitor system involves checking your heart's electrical activity. It's a non-invasive procedure that uses a device to record your heart's rhythm and rate. This helps identify any irregularities, ensuring your heart is functioning properly.

19 services16 patients

Ultrasound evaluation of heart blood vessel with review by radiologist 93662

This is a noninvasive procedure using sound waves to capture images of your heart's blood vessels. A radiologist, an expert in interpreting these images, will review the results to check for any abnormalities. This helps to monitor your heart health.

18 services18 patients

Programming of dual lead implantable defibrillator system 93283

Programming of a dual lead implantable defibrillator system involves adjusting settings on a device implanted in your chest. This device monitors your heart rhythm and delivers electrical pulses to correct irregular heartbeats, helping maintain a healthy heart rhythm.

17 services17 patients

Repair of left upper heart chamber with implant with review by radiologist 33340

This is a procedure to fix a problem in your left upper heart chamber. An implant is used to correct the issue. After the procedure, a radiologist, a doctor who specializes in medical imaging, reviews the images to ensure everything is in order.

16 services16 patients

Comprehensive electrophysiologic evaluation with catheter destruction of abnormality of upper chamber of heart causing supraventricular tachycardia (rapid heart rate) 93653

This procedure is a detailed study of your heart's electrical activity. A thin tube (catheter) is inserted into your heart to identify and eliminate the area causing a fast heart rate. This helps restore normal heart rhythm, specifically targeting the upper chamber of the heart.

16 services16 patients

External shock to heart to regulate heart beat 92960

This procedure, known as cardioversion, uses an external electrical shock to restore your heart's normal rhythm. It's typically performed when irregular heartbeats, or arrhythmias, are causing severe symptoms and aren't responding to medications.

12 services12 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Inova Alexandria Hospital

Acute Care Hospitals · Alexandria, VA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490040

Location4320 Seminary RdAlexandria, VA 22304 · Alexandria City County

Emergency services Birthing friendly

Inova Loudoun Hospital

Acute Care Hospitals · Leesburg, VA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490043

Location44045 Riverside ParkwayLeesburg, VA 20176 · Loudoun County

Emergency services Birthing friendly

Inova Fairfax Hospital

Acute Care Hospitals · Falls Church, VA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490063

Location3300 Gallows RoadFalls Church, VA 22042 · Fairfax County

Emergency services Birthing friendly

Inova Fair Oaks Hospital

Acute Care Hospitals · Fairfax, VA

5/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number490101

Location3600 Joseph Siewick DriveFairfax, VA 22033 · Fairfax County

Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 22031 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$147.85 typical visit price

range $65.18 – $194.86

Typical copayment $36.96 (range $16.29 – $48.71)

Most-billed visit code 99204

Established Patient

$113.72 typical visit price

range $21.40 – $158.88

Typical copayment $28.43 (range $5.35 – $39.72)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 8

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

BRETT D. ATWATER M.D.

Internal Medicine (Clinical Cardiac Electrophysiology)