Quick answers
- Where does William E. Macdonnell Jr. see patients?
- Medicare's clinician data lists 2 practice locations, including Clarksburg, MD and Damascus, MD. Call before your visit to confirm the address.
- What is William E. Macdonnell Jr.'s specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does William E. Macdonnell Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says William E. Macdonnell Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William E. Macdonnell Jr.?
- (301) 482-1000, as listed in official Medicare / NPI Registry data.
- What is William E. Macdonnell Jr.'s NPI number?
- 1225086994. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where William E. Macdonnell Jr. is enrolled with Medicare (CMS data updated 2026-10-02).
- 22750 Newcut Rd, Suite D1bClarksburg, MD 20871 (301) 482‑1000
- 9809 Main St, Suite 103Damascus, MD 20872 (301) 482‑1000
Group practices
Medicare enrollment lists William E. Macdonnell Jr. as a member of this group (CMS data updated 2026-10-02).
- Innovative Urgent Care, LLC14 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Clarksburg
Clinicians with the same Medicare primary specialty in Clarksburg, MD — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2001 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225086994 |
| 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 2026-10-02, retrieved 2026-10-29
- 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