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Mrs. Theresa Marie Gillis, PA-C

Physician Assistant in Frederick, MD · enumerated 2008 · practices at Mid-Maryland Oral and Maxillofacial Surgery PA.

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

National Provider Identifier

1306024476

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Registry record

Entity type Individual (Type 1)
Name Mrs. Theresa Marie Gillis
Credential PA-C
Sex Female
Practice address 68 Thomas Johnson Dr, Suite C, Frederick, MD, 21702
Phone (301) 694-5292
Fax (301) 694-2319
Enumeration date Jan 31, 2008
Last updated in NPPES May 16, 2023

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License C0003401 (MD) Primary

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

What specialty is Theresa Gillis?
Theresa Gillis is registered in NPPES with the primary taxonomy of Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-05-16.