Quick answers
- Does Margaret M. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret M. Williams 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 M. Williams see?
- In 2024, CMS data shows 489 Original Medicare patients and 79,638 services for Margaret M. Williams. This counts Original Medicare only and measures volume, not quality.
- What is Margaret M. Williams's NPI number?
- 1831553585. 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 M. Williams, 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 | 489 |
|---|---|
| Services billed to Medicare | 79,638 |
| Different services or procedures | 88 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Injection, ferric carboxymaltose, 1 mg (J1439)44,250 services
- Injection, darbepoetin alfa, 1 microgram (non-esrd use) (J0881)17,100 services
- Injection, ferric derisomaltose, 10 mg (J1437)2,600 services
- Injection, denosumab, 1 mg (J0897)1,980 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)356 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%
- Arthritis50%
- Chronic kidney disease46%
- Diabetes44%
- Ischemic heart disease39%
Hospitals where Margaret M. Williams works
Medicare's Facility Affiliation Data lists Margaret M. Williams 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.
- Luminis Health Anne Arundel Medical Center, IncAnnapolis, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210023
- University of MD Shore Medical Center at ChestertownChestertown, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210030
- University of MD Shore Medical Center at EastonEaston, MD · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 210037
Practice locations
Addresses where Margaret M. Williams is enrolled with Medicare (CMS data updated October 2, 2026).
- 2977 4h Park Rd, Suite 102Centreville, MD 21617 (410) 758‑4030
- 8221 Teal Dr, Suite 302Easton, MD 21601 (410) 820‑5945
Group practices
Medicare enrollment lists Margaret M. Williams as a member of this group (CMS data updated October 2, 2026).
- American Oncology Partners PA391 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Centreville
Clinicians with the same Medicare primary specialty in Centreville, MD — not a recommendation.
Other clinicians in American Oncology Partners PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2013 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831553585 |
| 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