Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mrs. Theresa Marie Gillis, PA-C

Individual provider Physician Assistant · NPI 1306024476

Mrs. Theresa Marie Gillis, PA-C is a Physician Assistant in Frederick, Maryland. Qualified in 1997, 29 years ago. Practices with Frederick Health Medical Group LLC, a 202-clinician group, works from 16 locations, accepts Medicare assignment and offers telehealth. Licensed in Maryland.

Years since qualifying
29
Licensed in
MD
In the registry since
2008
What do these letters mean?
PA-C — Physician Assistant, Certified
A physician assistant who holds current national certification.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

68 Thomas Johnson Dr Ste C
Frederick, MD 21702-4300
Phone: (301) 694-5292
Fax: (301) 694-2319
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (15)

  • 1194 Dutchmans Creek Dr, Brunswick, MD 21716-9786 — (240) 215-6310
  • 16403 Old Emmitsburg Rd, Emmitsburg, MD 21727-8929 — (240) 215-6310
  • 400 W 7th St, Frederick, MD 21701-4506 — (240) 215-6310
  • 1 Frederick Health Way, Frederick, MD 21701-9435 — (240) 215-6310
  • 141 Thomas Johnson Dr, Frederick, MD 21702-4502 — (301) 846-0100
  • 75 Thomas Johnson Dr, Frederick, MD 21702-4895 — (240) 215-6310
  • 1562 Opossumtown Pike, Frederick, MD 21702-4920 — (240) 215-6310
  • 194 Thomas Johnson Dr, Frederick, MD 21702-4679 — (240) 215-6310
  • 7211 Bank Ct, Frederick, MD 21703-8483 — (240) 215-6310
  • 3430 Worthington Blvd, Frederick, MD 21704-7017 — (240) 215-6310
  • 230 W Patrick St, Frederick, MD 21701-6945 — (240) 215-6310
  • 501 W 7th St, Frederick, MD 21701-4586 — (240) 215-6310
  • 504 E Ridgeville Blvd, Mount Airy, MD 21771-5942 — (240) 215-6310
  • 3000d Ventrie Ct, Myersville, MD 21773-7817 — (240) 215-6310
  • 15 E Frederick St, Walkersville, MD 21793-8234 — (240) 215-6310

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence C0003401 (MD)

Record details

NPI number1306024476
Entity typeIndividual (Type 1)
GenderFemale
Credentials PA-C
Sole proprietorNo
NPI enumeratedJanuary 31, 2008
Last updated in NPPESMay 16, 2023
Certification dateMay 16, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 1997 (29 years in practice)
Group practice Frederick Health Medical Group Llc — 202 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations8 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients584
Services billed 4,532 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $702 21 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Frederick Health Medical Group LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 202 clinicians in the practice; 12 are shown here.

Other providers in Frederick