Quick answers
- Which hospitals does Gregory A. Greenberg work at?
- Medicare's official clinician data lists Gregory A. Greenberg at 1 hospital: Mad River Community Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory A. Greenberg see patients?
- Medicare's clinician data lists 3 practice locations, including El Cajon, CA, Arcata, CA and Tacoma, WA. Call before your visit to confirm the address.
- What is Gregory A. Greenberg's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Gregory A. Greenberg accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory A. Greenberg 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 A. Greenberg?
- (619) 841-1310, as listed in official Medicare / NPI Registry data.
- What is Gregory A. Greenberg's NPI number?
- 1013927441. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory A. Greenberg works
Medicare's Facility Affiliation Data lists Gregory A. Greenberg at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mad River Community HospitalArcata, CA · Acute Care Hospital · CCN 050028
Practice locations
Addresses where Gregory A. Greenberg is enrolled with Medicare (CMS data updated 2026-10-02).
- 1240 BroadwayEl Cajon, CA 92021 (619) 841‑1310
- 3800 Janes RdArcata, CA 95521
- 503 E 26th St, Cedar Wellness ClinicTacoma, WA 98421 (253) 881‑7001
Group practices
Medicare enrollment lists Gregory A. Greenberg as a member of these groups (CMS data updated 2026-10-02).
- North Pacific Cardiology Medical22 clinicians in the group
- Puyallup Tribal Opioid Clinic Inc12 clinicians in the group
- Revive Pathway12 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in El Cajon
Clinicians with the same Medicare primary specialty in El Cajon, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Ohio State University College Of Medicine |
| Graduation year | 2001 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1013927441 |
| 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