Gregory Aaen, M.D.
NPI 1780898304 · Neurology with Special Qualifications in Child Neurology Physician · Loma Linda, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Aaen, M.D. is a Neurology with Special Qualifications in Child Neurology Physician provider in Loma Linda, CA (NPI 1780898304).
Provider details
- NPI number
- 1780898304
- Entity type
- Individual
- Primary specialty
- Neurology with Special Qualifications in Child Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A90485 (CA)
Specialties & taxonomies
- Neurology with Special Qualifications in Child Neurology PhysicianPrimary2084N0402XLicense A90485 (CA)
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$97 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-10
- Last updated
- 2007-07-08
Frequently asked questions
- What is Gregory Aaen's NPI number?
- Gregory Aaen's National Provider Identifier (NPI) is 1780898304, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Aaen's specialty?
- Gregory Aaen is listed in the NPPES registry with a primary specialty of Neurology with Special Qualifications in Child Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Aaen located?
- Gregory Aaen's practice location on file with NPPES is Llumc, House Staff Office Cp 21005, 11234 Anderson St., Loma Linda, CA 92354.
- What is Gregory Aaen's phone number?
- The practice phone number listed in the NPPES registry for Gregory Aaen is (909) 558-4000.
- Does Gregory Aaen accept Medicare?
- Gregory Aaen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Aaen's NPI active?
- Yes — Gregory Aaen's NPI (1780898304) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.