Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Maria D Merzouk, D.O.

Gynecologic Oncology Physician in Hagerstown, MD · enumerated 2006 · practices at Johns Hopkins University.

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

National Provider Identifier

1811908023

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Registry record

Entity type Individual (Type 1)

Name Dr. Maria D Merzouk

Credential D.O.

Sex Female

Practice address 11110 Medical Campus Rd Ste 249, Hagerstown, MD, 21742

Phone (301) 714-4100

Fax (301) 714-4101

Enumeration date Aug 11, 2006

Last updated in NPPES Jul 13, 2018

Taxonomy & licenses

207VX0201X Gynecologic Oncology Physician Allopathic & Osteopathic Physicians · License 2181 (WV) Secondary

207VX0201X Gynecologic Oncology Physician Allopathic & Osteopathic Physicians · License H85851 (MD) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
3810005936	Medicaid	WV	-

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Maria Merzouk?

Maria Merzouk is registered in NPPES with the primary taxonomy of Gynecologic Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-07-13.