Quick answers
- Which hospitals does John P. Mackrell work at?
- Medicare's official clinician data lists John P. Mackrell at 5 hospitals: MedStar Franklin Square Medical Center, MedStar Montgomery Medical Center, MedStar Washington Hospital Center, Roxborough Memorial Hospital and Union Hospital of Cecil County. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John P. Mackrell see patients?
- Medicare's clinician data lists 6 practice locations, including Elkton, MD, Silver Spring, MD and Hollywood, MD. Call before your visit to confirm the address.
- What is John P. Mackrell's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does John P. Mackrell accept Medicare assignment?
- Yes. Medicare's clinician data says John P. Mackrell 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 John P. Mackrell?
- (410) 398-4000, as listed in official Medicare / NPI Registry data.
- What is John P. Mackrell's NPI number?
- 1447426499. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John P. Mackrell works
Medicare's Facility Affiliation Data lists John P. Mackrell at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- MedStar Franklin Square Medical CenterRosedale, MD · Acute Care Hospital · CCN 210015
- MedStar Montgomery Medical CenterOlney, MD · Acute Care Hospital · CCN 210018
- MedStar Washington Hospital CenterWashington, DC · Acute Care Hospital · CCN 090011
- Roxborough Memorial HospitalPhiladelphia, PA · Acute Care Hospital · CCN 390304
- Union Hospital of Cecil CountyElkton, MD · Acute Care Hospital · CCN 210032
Practice locations
Addresses where John P. Mackrell is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 106 Bow StElkton, MD 21921 (410) 398‑4000
- 1117 Cresthaven DrSilver Spring, MD 20903 (215) 483‑9900
- 24035 Three Notch RdHollywood, MD 20636 (301) 373‑7900
- 25500 Point Lookout RdLeonardtown, MD 20650 (240) 434‑4088
- 30 McMullens WharfPerryville, MD 21903 (215) 483‑9900
Group practices
Medicare enrollment lists John P. Mackrell as a member of these groups (CMS data updated 2026-10-02).
- MedStar Medical Group II LLC3,767 clinicians in the group
- Union Hospital of Cecil County288 clinicians in the group
- MedStar Medical Group - Southern Maryland LLC245 clinicians in the group
- Precision Diagnostic Radiology LLC7 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Elkton
Clinicians with the same Medicare primary specialty in Elkton, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Temple University School Of Medicine |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447426499 |
| 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 2026-10-02, retrieved 2026-10-29
- 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