Quick answers
- Which hospitals does Greg E. Maler work at?
- Medicare's official clinician data lists Greg E. Maler at 1 hospital: Pomona Valley Hospital Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Greg E. Maler see patients?
- Medicare's clinician data lists 2 practice locations, including Ontario, CA. Call before your visit to confirm the address.
- What is Greg E. Maler's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Greg E. Maler accept Medicare assignment?
- Yes. Medicare's clinician data says Greg E. Maler 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 Greg E. Maler?
- (909) 984-7384, as listed in official Medicare / NPI Registry data.
- What is Greg E. Maler's NPI number?
- 1033613104. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Greg E. Maler works
Medicare's Facility Affiliation Data lists Greg E. Maler at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Pomona Valley Hospital Medical CenterPomona, CA · Acute Care Hospital · CCN 050231
Practice locations
Addresses where Greg E. Maler is enrolled with Medicare (CMS data updated 2026-10-02).
- 1556 S Sultana AveOntario, CA 91761 (909) 984‑7384
- 2680 E Riverside DrOntario, CA 91761 (909) 630‑7927
Group practices
Medicare enrollment lists Greg E. Maler as a member of this group (CMS data updated 2026-10-02).
- Pomona Community Health Center7 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Ontario
Clinicians with the same Medicare primary specialty in Ontario, CA — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2018 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033613104 |
| 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