Quick answers
- Which hospitals does Oscar Adler work at?
- Medicare's official clinician data lists Oscar Adler at 3 hospitals: Inova Fairfax Hospital, Inova Loudoun Hospital and Reston Hospital Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Oscar Adler see patients?
- Medicare's clinician data lists 5 practice locations, including Leesburg, VA, Ashburn, VA and Alexandria, VA. Call before your visit to confirm the address.
- What is Oscar Adler's specialty?
- Medicare lists Nephrology as the primary specialty.
- Does Oscar Adler accept Medicare assignment?
- Yes. Medicare's clinician data says Oscar Adler 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 Oscar Adler offer telehealth?
- Medicare's clinician data says Oscar Adler offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Oscar Adler?
- (703) 729-7652, as listed in official Medicare / NPI Registry data.
- What is Oscar Adler's NPI number?
- 1700874138. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Oscar Adler works
Medicare's Facility Affiliation Data lists Oscar Adler at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Inova Fairfax HospitalFalls Church, VA · Acute Care Hospital · CCN 490063
- Inova Loudoun HospitalLeesburg, VA · Acute Care Hospital · CCN 490043
- Reston Hospital CenterReston, VA · Acute Care Hospital · CCN 490107
Practice locations
Addresses where Oscar Adler is enrolled with Medicare (CMS data updated 2026-10-02).
- 19490 Sandridge WayLeesburg, VA 20176
- 20955 Professional Plz, Suite 200Ashburn, VA 20147 (703) 729‑7652
- 224 D Cornwall St NWLeesburg, VA 20176
- 44084 Riverside Pkwy, Suite 300Leesburg, VA 20176 (703) 724‑7530
- 6355 Walker Ln, 308 Metropolitan EntAlexandria, VA 22310 (703) 313‑7700
Group practices
Medicare enrollment lists Oscar Adler as a member of this group (CMS data updated 2026-10-02).
- Loudoun Medical Group, PC271 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Virginia
Clinicians with the same Medicare primary specialty in Virginia — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1700874138 |
| 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