Quick answers
- Does Margaret B. Fischer accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret B. Fischer 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 Margaret B. Fischer see?
- In 2024, CMS data shows 456 Original Medicare patients and 1,810 services for Margaret B. Fischer. This counts Original Medicare only and measures volume, not quality.
- What is Margaret B. Fischer's NPI number?
- 1437128634. 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 Margaret B. Fischer, 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 | 456 |
|---|---|
| Services billed to Medicare | 1,810 |
| Different services or procedures | 70 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)391 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)250 services
- New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)105 services
- Evaluation of cardiac rhythm monitor system, remote up to 30 days (93298)88 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days (93296)70 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%
- Atrial fibrillation68%
- Ischemic heart disease60%
- Arthritis53%
- Heart failure44%
Hospitals where Margaret B. Fischer works
Medicare's Facility Affiliation Data lists Margaret B. Fischer 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
- MedStar Washington Hospital CenterWashington, DC · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 090011
- Meritus Medical CenterHagerstown, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210001
- Virginia Hospital CenterArlington, VA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 490050
Practice locations
Addresses where Margaret B. Fischer is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 8; the Medicare profile lists all.
- 110 Irving St NWWashington, DC 20010 (202) 877‑7000
- 1406 Crain S Hwy 106Glen Burnie, MD 21061 (410) 768‑6440
- 163 Thomas Johnson DrFrederick, MD 21702 (202) 877‑7685
- 1701 N George Mason DrArlington, VA 22205 (703) 558‑6267
- 1733 Howell RdHagerstown, MD 21740 (703) 208‑7257
Group practices
Medicare enrollment lists Margaret B. Fischer as a member of these groups (CMS data updated October 2, 2026).
- MedStar Medical Group II LLC3,767 clinicians in the group
- MedStar Heart Institute LLC301 clinicians in the group
Specialties
- Cardiac Electrophysiologyprimary
Find other Cardiac Electrophysiology doctors in District of Columbia →
Other cardiac electrophysiologists in Washington
Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.
Other clinicians in MedStar Medical Group II LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Toledo Medical College |
| Graduation year | 1986 (40 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437128634 |
| 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