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Ophthalmology

Robert C. Gunzenhauser, MD

Sees patients in Upland, CA · California

Summary

Robert C. Gunzenhauser, MD (Ophthalmology) is enrolled with Medicare at 1 practice location in Upland, CA. NPI 1457988065. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(909) 981‑9800 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Robert C. Gunzenhauser, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

1Practice location
OphthalmologyPrimary specialty
YesAccepts Medicare assignment
6Years since medical school (graduated 2020)
Wake Forest University School Of MedicineMedical school
MaleGender (as listed)
Marc H Shomer MD PHD IncGroup practice

Quick answers

Where does Robert C. Gunzenhauser see patients?
Medicare's clinician data lists 1 practice location in Upland, CA. Call before your visit to confirm the address.
What is Robert C. Gunzenhauser's specialty?
Medicare lists Ophthalmology as the primary specialty.
Does Robert C. Gunzenhauser accept Medicare assignment?
Yes. Medicare's clinician data says Robert C. Gunzenhauser 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 C. Gunzenhauser?
(909) 981-9800, as listed in official Medicare / NPI Registry data.
What is Robert C. Gunzenhauser's NPI number?
1457988065. 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 C. Gunzenhauser is enrolled with Medicare (CMS data updated 2026-10-02).

Group practices

Medicare enrollment lists Robert C. Gunzenhauser as a member of this group (CMS data updated 2026-10-02).

  • Marc H Shomer MD PHD Inc2 clinicians in the group

Specialties

Find other Ophthalmology doctors in California →

Other ophthalmologists in Upland

Clinicians with the same Medicare primary specialty in Upland, CA — not a recommendation.

All ophthalmologists in Upland →

Clinician information

CredentialMD
Medical schoolWake Forest University School Of Medicine
Graduation year2020
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1457988065
CorrectionsReport 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

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians