Quick answers
- Which hospitals does Dennis A. Cullen work at?
- Medicare's official clinician data lists Dennis A. Cullen at 2 hospitals: MedStar Georgetown University Hospital and Sibley Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Dennis A. Cullen see patients?
- Medicare's clinician data lists 3 practice locations, including Washington, DC and Bethesda, MD. Call before your visit to confirm the address.
- What is Dennis A. Cullen's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Dennis A. Cullen accept Medicare assignment?
- Yes. Medicare's clinician data says Dennis A. Cullen 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 Dennis A. Cullen?
- (202) 686-0813, as listed in official Medicare / NPI Registry data.
- What is Dennis A. Cullen's NPI number?
- 1104988054. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Dennis A. Cullen works
Medicare's Facility Affiliation Data lists Dennis A. Cullen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- MedStar Georgetown University HospitalWashington, DC · Acute Care Hospital · CCN 090004
- Sibley Memorial HospitalWashington, DC · Acute Care Hospital · CCN 090005
Practice locations
Addresses where Dennis A. Cullen is enrolled with Medicare (CMS data updated 2026-10-02).
- 4910 Massachusetts Ave NW, Suite 114 Grady Dc OfficeWashington, DC 20016 (202) 686‑0813
- 6410 Rockledge Dr, Suite 600Bethesda, MD 20817
- 7625 Wisconsin Ave, Suite 101Bethesda, MD 20814 (301) 951‑0420
Group practices
Medicare enrollment lists Dennis A. Cullen as a member of these groups (CMS data updated 2026-10-02).
- Suburban/Nrh Medical Rehabilitation Inc941 clinicians in the group
- Privia Care Center LLC287 clinicians in the group
Specialties
- Internal Medicineprimary
Find other Internal Medicine doctors in District of Columbia →
Other internal medicine doctors in Washington
Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgetown University School Of Medicine |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104988054 |
| 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