LOUDOUN MEDICAL GROUP, PC
NPI 1912156266
Obstetrics & Gynecology in Sterling, VA

NPI Status: Active since September 11, 2008

Contact Information

21135 WHITFIELD PL STE 107
STERLING, VA
ZIP 20165
Phone: (703) 430-2070
Fax: (703) 430-2952

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  • Organization
  • Obstetrics & Gynecology
  • CLIA Number: 49D2133743
  • CLIA Cert. Type: Physician Office
  • CLIA Exp. Date: 07-18-2027

About LOUDOUN MEDICAL GROUP, PC

This page provides the complete NPI Profile along with additional information for Loudoun Medical Group, Pc, a women's health care provider established in Sterling, Virginia operating as a Obstetrics & Gynecology. The healthcare provider is registered in the NPI registry with number 1912156266 assigned on September 2008. The practitioner's primary taxonomy code is 207V00000X. The provider is registered as an organization and their NPI record was last updated one year ago. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization. The provider's . The authorized official of this NPI record is Mary Beth Tamasy (Ceo)

NPI
1912156266
Provider Legal Name
LOUDOUN MEDICAL GROUP, PC
Other Organization Name
Other Name Type
(6)
Entity Type
Organization
Location Address
21135 WHITFIELD PL STE 107 STERLING, VA 20165
Location Phone
(703) 430-2070
Location Fax
(703) 430-2952
Mailing Address
224D CORNWALL ST NW STE 403 LEESBURG, VA 20176
Mailing Phone
(703) 737-6010
Mailing Fax
(703) 430-2952
Is Sole Proprietor?
No
Is Organization Subpart?
Yes
Enumeration Date
09-11-2008
Last Update Date
11-03-2025
Code Navigator

Women's health care providers like Loudoun Medical Group, Pc treat and diagnose diseases and conditions that affect a woman's physical and emotional health. Women's health professionals come from a variety of different specialties, including obstetrician/gynecologists, general surgeons, perinatologists, physician assistants, nurse practitioners or nurse midwives. A women's health provider might help you with family planning, breast care, pregnancy and child birth, osteoporosis, menopause, heart disease, etc.

Location Map

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Obstetrics & Gynecology

Taxonomy Code
207V00000X
Type
Allopathic & Osteopathic Physicians
Taxonomy Description
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

Group Taxonomy 193400000X SINGLE SPECIALTY GROUP

This provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.

Authorized Official

The authorized official is the designated individual with the legal authority to make changes to the provider’s official NPI record. For organizations, the authorized official must be a general partner, chairman of the board, CEO, CFO or a direct owner holding at least a 5 percent stake in the medical organization.

Authorized Official Name

MARY BETH TAMASY

Authorized Official Title
CEO
Authorized Official Phone
(703) 737-6010

CLIA Information

The Clinical Laboratory Improvement Amendments (CLIA) of 1988 applies to facilities or sites that test human specimens for health assessment or to diagnose, prevent, or treat disease. The CLIA Program sets standards for clinical laboratory testing and issues certificates. The NPI / CLIA crosswalk information for this NPI number is:

CLIA Number
49D2133743
Facility Type
Physician Office
Certificate Effective Date
July 19, 2025
Certificate Expiration Date
July 18, 2027
Laboratory Director
JENNIFER THOMPSON
Certificate Type
Certificate for Provider-Performed Microscopy Procedures (PPMP)
Certificate Type Description
This CLIA certificate is issued to Loudoun Medical Group, Pc in which a physician, midlevel practitioner or dentist that performs specific microscopy procedures during the course of a patient's visit. A limited list of provider-performed microscopy procedures is included under this certificate type, which are categorized as moderate complexity testing.

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1912156266, we treat the final digit (6) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 54. The final step is to find the difference between that total and the next multiple of ten (60 - 54 = 6).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
9
Unchanged
Pos 3
1
Doubled → 2
Pos 4
2
Unchanged
Pos 5
1
Doubled → 2
Pos 6
5
Unchanged
Pos 7
6
Doubled → 12 → 1 + 2
Pos 8
2
Unchanged
Pos 9
6
Doubled → 12 → 1 + 2
Check
6
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 1 → 2 1 → 2 6 → 12 → 3 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 9 + 2 + 2 + 2 + 5 + 1 + 2 + 2 + 1 + 2 + 24 = 54

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 54 is 60. The difference is the calculated check digit.

60 - 54 = 6
This NPI is valid
The calculated check digit is 6, which matches the last digit of 1912156266.

Other Providers at the Same Location


The following 4 providers are registered at the same or a nearby location.

Family Medicine
21135 WHITFIELD PL STE 107
STERLING, VA 20165
Family Medicine
21135 WHITFIELD PL STE 107
STERLING, VA 20165
Nurse Practitioner (Family)
21135 WHITFIELD PL STE 107
STERLING, VA 20165
Clinic/Center (Primary Care)
21135 WHITFIELD PL STE 107
STERLING, VA 20165

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1912156266, enumerated as an "organization" on September 11, 2008.

The provider is located at 21135 WHITFIELD PL STE 107 STERLING, VA 20165 and the phone number is (703) 430-2070.

Obstetrics & Gynecology with taxonomy code 207V00000X.