Quick answers
- Which hospitals does Douglas J. Mayson work at?
- Medicare's official clinician data lists Douglas J. Mayson at 4 hospitals: Calverthealth Medical Center, MedStar Franklin Square Medical Center, MedStar Georgetown University Hospital and MedStar Saint Mary's Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Douglas J. Mayson see patients?
- Medicare's clinician data lists 5 practice locations, including Washington, DC, Olney, MD and Clinton, MD. Call before your visit to confirm the address.
- What is Douglas J. Mayson's specialty?
- Medicare lists Neurology as the primary specialty.
- Does Douglas J. Mayson accept Medicare assignment?
- Yes. Medicare's clinician data says Douglas J. Mayson 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.
- Does Douglas J. Mayson offer telehealth?
- Medicare's clinician data says Douglas J. Mayson offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Douglas J. Mayson?
- (202) 429-2401, as listed in official Medicare / NPI Registry data.
- What is Douglas J. Mayson's NPI number?
- 1821226622. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Douglas J. Mayson works
Medicare's Facility Affiliation Data lists Douglas J. Mayson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Calverthealth Medical CenterPrince Frederick, MD · Acute Care Hospital · CCN 210039
- MedStar Franklin Square Medical CenterRosedale, MD · Acute Care Hospital · CCN 210015
- MedStar Georgetown University HospitalWashington, DC · Acute Care Hospital · CCN 090004
- MedStar Saint Mary's HospitalLeonardtown, MD · Acute Care Hospital · CCN 210028
Practice locations
Addresses where Douglas J. Mayson is enrolled with Medicare (CMS data updated 2026-10-02).
- 1145 19th St NW, 311 Mmg at 19th Street NWWashington, DC 20036 (202) 429‑2401
- 18101 Prince Philip DrOlney, MD 20832 (301) 570‑7404
- 18105 Prince Philip DrOlney, MD 20832 (301) 774‑8962
- 3800 Reservoir Rd NWWashington, DC 20007
- 7503 Surratts RdClinton, MD 20735 (301) 868‑8000
Group practices
Medicare enrollment lists Douglas J. Mayson as a member of this group (CMS data updated 2026-10-02).
- MedStar Medical Group II LLC3,767 clinicians in the group
Specialties
- Neurologyprimary
Other neurologists in Washington
Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1821226622 |
| 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