Quick answers
- Where does Gregory S. Aaen see patients?
- Medicare's clinician data lists 2 practice locations, including Loma Linda, CA and San Bernardino, CA. Call before your visit to confirm the address.
- What is Gregory S. Aaen's specialty?
- Medicare lists Pediatric Medicine as the primary specialty, and also Neurology.
- Does Gregory S. Aaen accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory S. Aaen 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 Gregory S. Aaen?
- (909) 558-6388, as listed in official Medicare / NPI Registry data.
- What is Gregory S. Aaen's NPI number?
- 1780898304. 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 Gregory S. Aaen is enrolled with Medicare (CMS data updated 2026-10-02).
- 11370 Anderson StLoma Linda, CA 92354
- 250 E Caroline St, Suite JSan Bernardino, CA 92408 (909) 558‑6388
Group practices
Medicare enrollment lists Gregory S. Aaen as a member of this group (CMS data updated 2026-10-02).
- Faculty Physicians and Surgeons of Llusm1,315 clinicians in the group
Specialties
- Pediatric Medicineprimary
- Neurologyalso
Other pediatricians in Loma Linda
Clinicians with the same Medicare primary specialty in Loma Linda, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loma Linda University School Of Medicine |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1780898304 |
| 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