Quick answers
- Which hospitals does Timothy S. Mountcastle work at?
- Medicare's official clinician data lists Timothy S. Mountcastle at 1 hospital: Inova Fair Oaks Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Timothy S. Mountcastle see patients?
- Medicare's clinician data lists 3 practice locations, including Ashburn, VA and Alexandria, VA. Call before your visit to confirm the address.
- What is Timothy S. Mountcastle's specialty?
- Medicare lists Plastic and Reconstructive Surgery as the primary specialty, and also General Surgery and Vascular Surgery.
- Does Timothy S. Mountcastle accept Medicare assignment?
- Yes. Medicare's clinician data says Timothy S. Mountcastle 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 Timothy S. Mountcastle?
- (703) 729-7652, as listed in official Medicare / NPI Registry data.
- What is Timothy S. Mountcastle's NPI number?
- 1821015561. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Timothy S. Mountcastle works
Medicare's Facility Affiliation Data lists Timothy S. Mountcastle at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Inova Fair Oaks HospitalFairfax, VA · Acute Care Hospital · CCN 490101
Practice locations
Addresses where Timothy S. Mountcastle is enrolled with Medicare (CMS data updated 2026-10-02).
- 20955 Professional Plz, Suite 200Ashburn, VA 20147 (703) 729‑7652
- 44095 Pipeline Plz, Suite 430Ashburn, VA 20147 (703) 858‑3208
- 6355 Walker Ln, 308 Metropolitan EntAlexandria, VA 22310 (703) 313‑7700
Group practices
Medicare enrollment lists Timothy S. Mountcastle as a member of this group (CMS data updated 2026-10-02).
- Loudoun Medical Group, PC271 clinicians in the group
Specialties
Find other Plastic and Reconstructive Surgery doctors in Virginia →
Other plastic surgeons in Virginia
Clinicians with the same Medicare primary specialty in Virginia — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Howard University College Of Medicine |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821015561 |
| 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