Robert S. Mastman, M.D.
Ophthalmology Physician · San Jose, CA
Robert S. Mastman, M.D. is an ophthalmology physician with a practice address in San Jose, California, and NPI 1386683191, issued on Jun 6, 2006. Check the license (California A37122, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert S. Mastman
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A37122 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2577 Samaritan Dr, San Jose, CA 95124
- Phone
- (408) 358-2029
- Enumerated
- Jun 6, 2006
- Record last updated
- Nov 23, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (408) 356-5873
- Medicaid ID
- 00A371220 CA
- Medicare enrollment
- Enrolled (PECOS I20080814000602); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 2577 Samaritan Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Parvez Ahmed, M.D.Pediatrics Physician1114014586
- Kenneth Blumenfeld, M.D.Specialist1235158254
- Dorothy Buckner, M.D.Specialist1275681355
- Nicole Burnham, PAPhysician Assistant1952441297
- Anders Dahlstrom, MD PHDPediatric Gastroenterology Physician1326113929
- Bryan Drucker, M.D.Pediatrics Physician1083764856
Verify Robert S. Mastman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A37122Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
28% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,097 Medicare Part D claims for 377 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 62% of claims.
Most prescribed
- Latanoprost439 claims
- Neomycin-Polymyxin-Dexameth106 claims
- Brimonidine Tartrate45 claims
- Tobramycin-Dexamethasone44 claims
- Dorzolamide-Timolol41 claims
- Simbrinza35 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 83.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $405.42
18 payments; by number, the most common kind was food and beverage; the largest payer was Sun Pharmaceutical Industries Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Spectrum Eye Physicians A Medical CorporationCupertino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert S. Mastman among 2,899 ophthalmology physician records in California
Robert S. Mastman, M.D. 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 45% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1981 · median 2001 among the 1,907 with a school on file
- Record last updated2011 · 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 Jose → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Krikor Barsoumian, M.D.San Jose, CA 951241649296021
- Jeehee Kim, M.D.San Jose, CA 951241518977222
- Donald Lesser, M.D.San Jose, CA 951241801821632
- Edward Saub, M.D.San Jose, CA 951241447223219
- Gloria Wu, M.D.San Jose, CA 951241437178803
- Priti Dehkharghani, M.D.San Jose, CA 951231629232251
- Vincent Fan, MD, MBA, MA, FAAOSan Jose, CA 951231356586549
- David Kuo, MDSan Jose, CA 951231255867321
Common questions
What is Robert S. Mastman, M.D.'s NPI number?
Robert S. Mastman, M.D.'s National Provider Identifier (NPI) is 1386683191, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert S. Mastman, M.D. located?
The NPPES record lists a practice address at 2577 Samaritan Dr, San Jose, CA, 95124. Phone: (408) 358-2029. Providers update this record themselves, so call before visiting.
How can I verify Robert S. Mastman, M.D.'s license?
NPPES lists California license number A37122, 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 Robert S. Mastman, M.D. prescribe under Medicare Part D?
In 2024, Robert S. Mastman, M.D. had 1,097 Medicare Part D claims for 377 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Robert S. Mastman, M.D.'s MIPS final score?
The 2023 MIPS final score is 83.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.