Harold Hassin
Ophthalmology Physician · Belvedere, CA
Harold Hassin is an ophthalmology physician with a practice address in Belvedere, California, and NPI 1699221192, issued on Aug 25, 2016. Check the license (California G20663, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Harold Hassin
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G20663 CA
Self-reported in NPPES; status is on the state search - Practice location
- 28 Bayview Ave, Belvedere, CA 94920
- Phone
- (415) 435-5766
- Enumerated
- Aug 25, 2016
- Record last updated
- Aug 25, 2016 (not updated in 10 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 →
Verify Harold Hassin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G20663Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average ophthalmology physician in 2024
12 Medicare Part D claims, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Harold Hassin among 2,899 ophthalmology physician records in California
Harold Hassin 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 2016, is newer than 86% of them.
- NPI issued2016 · 86% of these records are older, 12% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2016 · 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 → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Lawrence Lonn, M.D.Belvedere, CA 949201275623373
- Robert Anderson, MDGreenbrae, CA 949041760487227
- Matthew BedellGreenbrae, CA 949041508159344
- Louisa Lu, MDGreenbrae, CA 949041285261289
- Gayle Shimokaji, MDGreenbrae, CA 949041912099672
- Richard Alvarado, MDSan Rafael, CA 949031154400299
- Alice Cheng-Bennett, MDSan Rafael, CA 949031942384938
- J. David Claiborne, MDSan Rafael, CA 949031801970884
Common questions
What is Harold Hassin's NPI number?
Harold Hassin's National Provider Identifier (NPI) is 1699221192, issued on Aug 25, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Harold Hassin located?
The NPPES record lists a practice address at 28 Bayview Ave, Belvedere, CA, 94920. Phone: (415) 435-5766. Providers update this record themselves, so call before visiting.
How can I verify Harold Hassin's license?
NPPES lists California license number G20663, 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 Harold Hassin prescribe under Medicare Part D?
In 2024, Harold Hassin had 12 Medicare Part D claims; 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.