Quick answers
- Does Rachel R. Marcus accept Medicare assignment?
- Yes. Medicare's clinician data says Rachel R. Marcus 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 Rachel R. Marcus see?
- In 2024, CMS data shows 811 Original Medicare patients and 1,135 services for Rachel R. Marcus. This counts Original Medicare only and measures volume, not quality.
- What is Rachel R. Marcus's NPI number?
- 1811953870. 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 Rachel R. Marcus, 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 | 811 |
|---|---|
| Services billed to Medicare | 1,135 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)711 services
- Ultrasound of heart, follow-up (93308)123 services
- Heart muscle strain imaging (93356)61 services
- Ultrasound of heart with probe in esophagus, with report (93312)56 services
- Ultrasound of heart with color-depicted blood flow, rate and valve function (93325)55 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%
- Ischemic heart disease66%
- Heart failure63%
- Arthritis56%
- Diabetes55%
Hospitals where Rachel R. Marcus works
Medicare's Facility Affiliation Data lists Rachel R. Marcus 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.
- Geisinger Medical CenterDanville, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390006
- Geisinger Wyoming Valley Medical CenterWilkes-Barre, PA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 390270
- Geisinger-Community Medical CenterScranton, PA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 390001
- MedStar Good Samaritan HospitalBaltimore, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210056
- MedStar Union Memorial HospitalBaltimore, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210024
Practice locations
Addresses where Rachel R. Marcus is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 10; the Medicare profile lists all.
- 1406 Crain S Hwy 106Glen Burnie, MD 21061 (410) 768‑6440
- 201 E University PkwyBaltimore, MD 21218 (410) 554‑2000
- 2709 McKinley St NWWashington, DC 20015 (570) 271‑6144
- 3300 N Calvert StBaltimore, MD 21218 (410) 554‑6629
- 3300 N Calvert St, Mmg Union MemorialBaltimore, MD 21218 (410) 554‑6629
Group practices
Medicare enrollment lists Rachel R. Marcus as a member of these groups (CMS data updated October 2, 2026).
- MedStar Medical Group II LLC3,767 clinicians in the group
- Geisinger Clinic3,467 clinicians in the group
- MedStar Heart Institute LLC301 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Maryland →
Other cardiologists in Glen Burnie
Clinicians with the same Medicare primary specialty in Glen Burnie, MD — 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 | Stanford University School Of Medicine |
| Graduation year | 1994 (32 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811953870 |
| 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