Quick answers
- Does Margaret P. Holmes accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret P. Holmes 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 P. Holmes see?
- In 2024, CMS data shows 309 Original Medicare patients and 1,485 services for Margaret P. Holmes. This counts Original Medicare only and measures volume, not quality.
- What is Margaret P. Holmes's NPI number?
- 1619268737. 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 P. Holmes, 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 | 309 |
|---|---|
| Services billed to Medicare | 1,485 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Pathology examination of tissue using a microscope, intermediate complexity (88305)464 services
- Special stained specimen slides to examine tissue, each additional procedure (88341)321 services
- Evaluation of fine needle aspirate with interpretation and report (88173)145 services
- Special stained specimen slides to examine tissue, initial procedure (88342)130 services
- Microscopic genetic analysis of tumor, manual (88360)97 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%
- Arthritis54%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)38%
- Diabetes34%
- Ischemic heart disease32%
Hospitals where Margaret P. Holmes works
Medicare's Facility Affiliation Data lists Margaret P. Holmes 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.
- MedStar Georgetown University HospitalWashington, DC · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 090004
Practice locations
Addresses where Margaret P. Holmes is enrolled with Medicare (CMS data updated October 2, 2026).
- 25500 Point Lookout RdLeonardtown, MD 20650 (240) 434‑4088
- 3800 Reservoir Rd NWWashington, DC 20007 (202) 444‑2000
- 9000 Franklin Square DrBaltimore, MD 21237 (443) 777‑7000
Group practices
Medicare enrollment lists Margaret P. Holmes as a member of this group (CMS data updated October 2, 2026).
- MedStar Medical Group II LLC3,767 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Leonardtown
Clinicians with the same Medicare primary specialty in Leonardtown, 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 | University Of Vermont College Of Medicine |
| Graduation year | 2011 (15 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1619268737 |
| 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