Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Christos Mastroyannis, MD FACOG

Reproductive Endocrinology Physician in Fairfax, VA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1629009543

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Registry record

Entity type Individual (Type 1)

Name Dr. Christos Mastroyannis

Credential MD FACOG

Sex Male

Practice address 8501 Arlington Blvd, Ste 500, Fairfax, VA, 22031

Phone (877) 449-0400

Fax (866) 696-6573

Enumeration date Jul 6, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 0101045024 (VA) Primary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License MD16241 (DC) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License D0030967 (MD) Secondary

Other identifiers

Identifier	Type	State	Issuer
J5120002	Other	VA	CAREFIRST
3137110	Other	VA	ALLIANCE
058066	Other	VA	ANTHEM BCBS
0721945	Other	VA	CIGNA
238730	Other	VA	ANTHEM
4137457	Other	VA	AETNA

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Where does Christos Mastroyannis practice?

The practice location on file with NPPES is in Fairfax, VA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Christos Mastroyannis?

The National Provider Identifier (NPI) for Christos Mastroyannis is 1629009543, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Medical Oncology and Hematology Assoc of Northern Virginia Hematology & Oncology Physician · Fairfax, VA NPI 1043211006 Ali Fazel Gastroenterology Physician · Fairfax, VA NPI 1225024748 Glenna Andersen Obstetrics & Gynecology Physician · Fairfax, VA NPI 1447241989 Nancy Couleman Anesthesiology Physician · Fairfax, VA NPI 1033197561 Robin West Sports Medicine (Orthopaedic Surgery) Physician · Fairfax, VA NPI 1477529543 Total Renal Care Inc End-Stage Renal Disease (ESRD) Treatment Clinic/Center · Fairfax, VA NPI 1255395158 Ben Nguyen Neurological Surgery Physician · Fairfax, VA NPI 1942248117 Elizabeth Friedman Physical Therapist · Fairfax, VA NPI 1558389528

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.