Quick answers
- Which hospitals does Regan Lyon work at?
- Medicare's official clinician data lists Regan Lyon at 3 hospitals: Colleton Medical Center, MedStar Georgetown University Hospital and MedStar Southern Maryland Hospital Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Regan Lyon see patients?
- Medicare's clinician data lists 4 practice locations, including Leonardtown, MD, Washington, DC and Walterboro, SC. Call before your visit to confirm the address.
- What is Regan Lyon's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Regan Lyon accept Medicare assignment?
- Yes. Medicare's clinician data says Regan Lyon 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 Regan Lyon?
- (240) 434-4088, as listed in official Medicare / NPI Registry data.
- What is Regan Lyon's NPI number?
- 1578874681. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Regan Lyon works
Medicare's Facility Affiliation Data lists Regan Lyon at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Colleton Medical CenterWalterboro, SC · Acute Care Hospital · CCN 420030
- MedStar Georgetown University HospitalWashington, DC · Acute Care Hospital · CCN 090004
- MedStar Southern Maryland Hospital CenterClinton, MD · Acute Care Hospital · CCN 210062
Practice locations
Addresses where Regan Lyon is enrolled with Medicare (CMS data updated 2026-10-02).
- 25500 Point Lookout RdLeonardtown, MD 20650 (240) 434‑4088
- 3800 Reservoir Rd NWWashington, DC 20007 (202) 444‑2000
- 501 Robertson BlvdWalterboro, SC 29488 (843) 782‑2000
- 9000 Franklin Square DrBaltimore, MD 21237 (443) 777‑7000
Group practices
Medicare enrollment lists Regan Lyon as a member of these groups (CMS data updated 2026-10-02).
- MedStar Medical Group II LLC3,767 clinicians in the group
- Acs Primary Care Physicians - Southeast PC420 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Leonardtown
Clinicians with the same Medicare primary specialty in Leonardtown, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Uniformed Services Uhs Fe Hebert School Of Med |
| Graduation year | 2010 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578874681 |
| 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