Quick answers
- Does Theresa M. Gillis accept Medicare assignment?
- Yes. Medicare's clinician data says Theresa M. Gillis accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Theresa M. Gillis see?
- In 2024, CMS data shows 584 Original Medicare patients and 4,532 services for Theresa M. Gillis. This counts Original Medicare only and measures volume, not quality.
- What is Theresa M. Gillis's NPI number?
- 1306024476. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Theresa M. Gillis, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 584 |
|---|---|
| Services billed to Medicare | 4,532 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Ultrasound measurement of bladder capacity after voiding (51798)497 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)450 services
- Automated urinalysis test (81003)328 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)229 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)104 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Ischemic heart disease38%
- Diabetes36%
- Anxiety26%
Hospitals where Theresa M. Gillis works
Medicare's Facility Affiliation Data lists Theresa M. Gillis at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Frederick Health HospitalFrederick, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210005
Practice locations
Addresses where Theresa M. Gillis is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 8; the Medicare profile lists all.
- 1 Frederick Health WayFrederick, MD 21701 (240) 215‑6310
- 1194 Dutchmans Creek DrBrunswick, MD 21716 (240) 215‑6310
- 16403 Old Emmitsburg RdEmmitsburg, MD 21727 (240) 215‑6310
- 194 Thomas Johnson DrFrederick, MD 21702 (240) 215‑6310
- 400 W 7th StFrederick, MD 21701
Group practices
Medicare enrollment lists Theresa M. Gillis as a member of this group (CMS data updated October 2, 2026).
- Frederick Health Medical Group LLC199 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Frederick
Clinicians with the same Medicare primary specialty in Frederick, MD — not a recommendation.
Other clinicians in Frederick Health Medical Group LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1997 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1306024476 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians