Quick answers
- Where does Robert G. Greenberg see patients?
- Medicare's clinician data lists 1 practice location in Walnut Creek, CA. Call before your visit to confirm the address.
- What is Robert G. Greenberg's specialty?
- Medicare lists Dermatology as the primary specialty.
- Does Robert G. Greenberg accept Medicare assignment?
- Yes. Medicare's clinician data says Robert G. 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 Robert G. Greenberg?
- (925) 932-7704, as listed in official Medicare / NPI Registry data.
- What is Robert G. Greenberg's NPI number?
- 1639195316. 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 Robert G. Greenberg is enrolled with Medicare (CMS data updated 2026-10-02).
- 355 Lennon Ln, Suite 255Walnut Creek, CA 94598 (925) 932‑7704
Group practices
Medicare enrollment lists Robert G. Greenberg as a member of this group (CMS data updated 2026-10-02).
- Golden State Dermatology Associates, Inc.125 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in Walnut Creek
Clinicians with the same Medicare primary specialty in Walnut Creek, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York Downstate Medical Center |
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639195316 |
| 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