Gary D. Groesbeck, MD
Ophthalmology Physician · San Diego, CA
Gary D. Groesbeck, MD is an ophthalmology physician with a practice address in San Diego, California, and NPI 1558419341, issued on Jan 8, 2007. Check the license (California G52329, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gary D. Groesbeck
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G52329 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4647 Zion Ave, San Diego, CA 92120
- Phone
- (619) 528-5000
- Enumerated
- Jan 8, 2007
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 4647 Zion Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gary D. Groesbeck in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G52329Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average ophthalmology physician in 2024
60 Medicare Part D claims for 35 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D.
Most prescribed
- Latanoprost26 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Gary D. Groesbeck among 2,899 ophthalmology physician records in California
Gary D. Groesbeck, MD is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 55% of them.
- NPI issued2007 · 55% of these records are older, 33% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2021 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in San Diego → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Calliope Allen, M.D.San Diego, CA 921201366415440
- Charles Beeson, MDSan Diego, CA 921201851450423
- Gary Clorfeine, MDSan Diego, CA 921201528127131
- Peter Custis, MDSan Diego, CA 921201144397076
- Eric Endo, MDSan Diego, CA 921201841348729
- Ann Hornby, MDSan Diego, CA 921201518015395
- Dianne Kim, MDSan Diego, CA 921201639246473
- Nancy Newman, MDSan Diego, CA 921201194884775
Common questions
What is Gary D. Groesbeck, MD's NPI number?
Gary D. Groesbeck, MD's National Provider Identifier (NPI) is 1558419341, issued on Jan 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gary D. Groesbeck, MD located?
The NPPES record lists a practice address at 4647 Zion Ave, San Diego, CA, 92120. Phone: (619) 528-5000. Providers update this record themselves, so call before visiting.
How can I verify Gary D. Groesbeck, MD's license?
NPPES lists California license number G52329, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gary D. Groesbeck, MD prescribe under Medicare Part D?
In 2024, Gary D. Groesbeck, MD had 60 Medicare Part D claims for 35 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.