ZACHARY T. HOLLIS M.D. – NPI #1104142744
Internal Medicine

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.

Health Care Provider Taxonomy Code for Internal Medicine

ZACHARY HOLLIS is a physician located in FAIRFAX, VA. NPPES has assigned the NPI number 1104142744 to ZACHARY HOLLIS on April 07, 2010. It is a Type-1 NPI, indicating this NPI number is associated with an individual. According to the NPI Registry, there are 10 additional location(s) assigned to this provider which are listed below. With multiple taxonomy codes selected, the primary taxonomy selected by this provider is 207RC0001X from the Health Care Provider Taxonomy code set, which is classified as Internal Medicine, specializing in Clinical Cardiac Electrophysiology

The NPI profile was last updated on Mar 04, 2026. Use the NPI data found here to bill health insurance companies, identify providers enrolled in Medicare and Medicaid services or other HIPAA compliant transactions. See the complete NPI profile for ZACHARY HOLLIS below.

NPI Profile for
ZACHARY T. HOLLIS

NPI Number
1104142744
Enumeration Date

(more than 16 years ago)
Entity Type
Type-1  Individual (Male)
Legal Name
ZACHARY T. HOLLIS
Credentials
M.D.
Primary location
8081 INNOVATION PARK DR STE 602
FAIRFAX, VA 22031-4867
Phone: (571) 472-3270 Fax: (571) 472-3271
10 Other location(s):
4320 Seminary Rd
Alexandria, VA 22304-1535
Phone: (703) 504-3000
Fax: (703) 504-3388
21785 Filigree Ct Ste 203
Ashburn, VA 20147-6214
Phone: (571) 472-3270
Fax: (571) 472-3271
3025 Hamaker Ct Ste 101
Fairfax, VA 22031-2229
Phone: (571) 472-3270
Fax: (571) 472-3271
3300 Gallows Rd
Falls Church, VA 22042-3307
Phone: (703) 776-4001
Fax: (703) 776-7113
351 Valley Health Way # 200
Front Royal, VA 22630-6480
Phone: (540) 636-0600
Fax: (540) 636-0629
224D Cornwall St NW Ste 306
Leesburg, VA 20176-2704
Phone: (571) 472-3270
Fax: (571) 472-3271
44045 Riverside Pkwy
Leesburg, VA 20176-5101
Phone: (703) 858-6000
Fax: (703) 858-6900
44084 Riverside Pkwy
Leesburg, VA 20176-8279
Phone: (571) 472-3270
Fax: (571) 472-3271
104 Selma Dr
Winchester, VA 22601-3834
Phone: (540) 678-2800
190 Campus Blvd Ste 201
Winchester, VA 22601
Phone: (540) 662-0306
Fax: (855) 264-2066
Mailing address
PO BOX 3250
WINCHESTER, VA 22604-2450
Phone: (703) 776-4001 Fax: (703) 776-2338
Sole Proprietor
No
Updated
Certification Date
Mar 04, 2026

Note: NPPES allows providers to attest to the accuracy of their NPI data. When a provider request any change to the NPI record, they will be able to attest to their changed NPI data, resulting in an updated certification date.

Taxonomy Code(s)

A taxonomy code is a code that describes the health care service provider's type, classification, and the area of specialization. The primary specialty for this provider is indicated as (Primary) below.

Taxonomy Classification / Specialization State License
207RC0001X
- Internal Medicine / Clinical Cardiac Electrophysiology (Primary)		 VA 0101265236
207RC0000X
- Internal Medicine / Cardiovascular Disease		 VA 0101265236
207R00000X
- Internal Medicine		 VA 0101265236

The taxonomy codes are selected by the provider at the time of NPI registration. Selection of a taxonomy code does not replace any credentialing or validation process that the provider requesting the code should complete.

Endpoint

Health Information Exchange (HEI)

HEI is the mobilization of health care information electronically across organizations within a region, community or hospital system. Endpoints provide a simple and secure way for participants to send authenticated, encrypted health information directly to known, trusted recipients over the internet such as primary care physicians, specialists, hospitals, labs, etc.

View All Endpoint(s)
Endpoint
[email protected]
Endpoint type
Direct Messaging Address
Endpoint Description
Content Type
Affiliation
N
Endpoint Location
1000 N SHENANDOAH AVE,
FRONT ROYAL, VA 77025-1669
Endpoint
[email protected]
Endpoint type
Direct Messaging Address
Endpoint Description
Content Type
Affiliation
N
Endpoint Location
1840 AMHERST ST,
WINCHESTER, VA 77025-1669
Endpoint
[email protected]
Endpoint type
Direct Messaging Address
Endpoint Description
Content Type
Affiliation
N
Endpoint Location
1870 AMHERST ST STE 100,
WINCHESTER, VA 77025-1669
Endpoint
[email protected]
Endpoint type
Direct Messaging Address
Endpoint Description
Content Type
Affiliation
N
Endpoint Location
1870 AMHERST ST STE 200,
WINCHESTER, VA 77025-1669
Endpoint
[email protected]
Endpoint type
Direct Messaging Address
Endpoint Description
Content Type
Affiliation
N
Endpoint Location
200 MEMORIAL DR,
LURAY, VA 77025-1669
Endpoint
[email protected]
Endpoint type
Direct Messaging Address
Endpoint Description
Content Type
Affiliation
N
Endpoint Location
351 VALLEY HEALTH WAY # 200,
FRONT ROYAL, VA 77025-1669
Endpoint
[email protected]
Endpoint type
Direct Messaging Address
Endpoint Description
Content Type
Affiliation
N
Endpoint Location
759 S MAIN ST,
WOODSTOCK, VA 77025-1669

Additional Information

Education
UNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB) - Graduated 2010
Accepts Medicare
This provider accepts Medicare-approved amount as payment in full. The Medicare-approved amount is the total the provider can be paid. When a provider accepts the Medicare-approved amount as payment, you won't be billed for more than the Medicare deductible & coinsureance.
Medicare Ordering & Referring
Provider can:
  • Refer to Part B
  • Order Durable Medical Equipment
  • Refer to Home Health Agency
  • Order Power Mobility Devices
Affiliations
ZACHARY HOLLIS is affiliated with the following medical group(s):
  • HOSPITAL
    • INOVA ALEXANDRIA HOSPITAL
      4320 SEMINARY RD
      ALEXANDRIA, VA 22304
    • INOVA FAIR OAKS HOSPITAL
      3600 JOSEPH SIEWICK DRIVE
      FAIRFAX, VA 22033
    • INOVA FAIRFAX HOSPITAL
      3300 GALLOWS ROAD
      FALLS CHURCH, VA 22042
    • INOVA LOUDOUN HOSPITAL
      44045 RIVERSIDE PARKWAY
      LEESBURG, VA 20176
    • WINCHESTER MEDICAL CENTER
      1840 AMHERST ST
      WINCHESTER, VA 22601

Why is my NPI data (personal information) being displayed publicly?
If you have an active NPI profile, your profile is required to be disclosed according to the FOIA and eFOIA. HIPAA also requires covered providers to share their NPI with other providers, health plans, clearinghouses and any entity that may need it for billing purposes.

How do I correct or change the NPI data displayed here?
At any time, providers can make changes to their NPI profile at NPPES. Login to NPPES to make changes online or call (800) 465-3203 for assistance. Changes made at NPPES will be reflected on this web site within a few days.

Can I hide my NPI profile from the public?
Unfortunately, No. The NPPES discloses health care provider data under the Freedom of Information Act to the public, which means anyone may request such information directly from the National Plan & Provider Enumeration System. See the complete CMS Data Dissemination Notice here.