Quick answers
- Where does Harold Cartier see patients?
- Medicare's clinician data lists 2 practice locations, including Washington, DC and Ashburn, VA. Call before your visit to confirm the address.
- What is Harold Cartier's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Harold Cartier accept Medicare assignment?
- Yes. Medicare's clinician data says Harold Cartier 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 Harold Cartier?
- (202) 745-7000, as listed in official Medicare / NPI Registry data.
- What is Harold Cartier's NPI number?
- 1508682345. 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 Harold Cartier is enrolled with Medicare (CMS data updated 2026-10-02).
- 1525 14th St NWWashington, DC 20005 (202) 745‑7000
- 41816 Fenway CirAshburn, VA 20148 (347) 761‑7200
Group practices
Medicare enrollment lists Harold Cartier as a member of these groups (CMS data updated 2026-10-02).
- Virginia Internal Medicine Inc105 clinicians in the group
- Whitman-Walker Clinic, Inc.62 clinicians in the group
Specialties
- Nurse Practitionerprimary
Find other clinicians: Nurse Practitioner, District of Columbia →
Other nurse practitioners in Washington
Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2024 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1508682345 |
| 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