Quick answers
- Does Sonya B. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Sonya B. 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 Sonya B. Williams see?
- In 2024, CMS data shows 500 Original Medicare patients and 5,117 services for Sonya B. Williams. This counts Original Medicare only and measures volume, not quality.
- What is Sonya B. Williams's NPI number?
- 1912999517. 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 Sonya B. 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 | 500 |
|---|---|
| Services billed to Medicare | 5,117 |
| Different services or procedures | 93 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)565 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)454 services
- Blood test, comprehensive group of blood chemicals (80053)450 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)427 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)409 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 cholesterol75%
- High blood pressure69%
- Arthritis42%
- Anxiety25%
- Depression22%
- Ischemic heart disease20%
Practice locations
Addresses where Sonya B. Williams is enrolled with Medicare (CMS data updated October 2, 2026).
- 1509 Ritchie HwyArnold, MD 21012 (410) 757‑7600
Group practices
Medicare enrollment lists Sonya B. Williams as a member of this group (CMS data updated October 2, 2026).
- Maryland Primary Care Physicians, LLC99 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Arnold
Clinicians with the same Medicare primary specialty in Arnold, MD — not a recommendation.
Other clinicians in Maryland Primary Care Physicians, LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2003 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1912999517 |
| 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
- 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