NPPES file of Aug 9, 2026

Samuel S. Masters, M.D.

Ophthalmology Physician · Santa Cruz, CA

Samuel S. Masters, M.D. is an ophthalmology physician with a practice address in Santa Cruz, California, and NPI 1265588784, issued on Jan 26, 2007. Check the license (California G55792, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1265588784
Name
Samuel S. Masters
Credential
M.D.
Primary taxonomy
Ophthalmology Physician 207W00000X
License number
G55792 CA
Self-reported in NPPES; status is on the state search
Practice location
1663 Dominican Way, Santa Cruz, CA 95065
Phone
(831) 475-5375
Enumerated
Jan 26, 2007
Record last updated
Dec 17, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(831) 475-7229
Medicaid ID
00G557920 CA
Medicare enrollment
Enrolled (PECOS I20141108000370); accepts Medicare assignment
Medical or professional school
Yale University School Of Medicine, 1971
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →

Also registered at 1663 Dominican Way

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Keith Britany, MFTMarriage & Family Therapist1619096088
  2. Chien Cheng, DDS MDOral and Maxillofacial Surgery (Dentist)1083728414
  3. Derrick Clark, PHDPsychologist1568566917
  4. Sanji Coutts, PHDPsychologist1245340652
  5. Gregory Katz, PH.D.Psychologist1386759157
  6. Andrew Kumasaka, M.D.Psychiatry Physician1346373487

Verify Samuel S. Masters in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G55792    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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83% fewer Medicare Part D claims than the average ophthalmology physician in 2024

256 Medicare Part D claims for 58 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims.

  1. Samuel Masters256
  2. Specialty average1,518

Most prescribed

  1. Latanoprost83 claims
  2. Neomycin-Polymyxin-Dexameth22 claims
  3. Timolol Maleate22 claims
  4. Dorzolamide-Timolol16 claims
  5. Prednisone12 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.

Industry payments in 2024: $21.49

1 payment: food and beverage; the largest payer was Thea Pharma 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.

  1. Samuel Masters$21.49
  2. Specialty average$4,535.02

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Samuel S. Masters among 2,899 ophthalmology physician records in California

Samuel S. Masters, 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 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 fileYes · 66% of these records are
  • Graduated1971 · median 2001 among the 1,907 with a school on file
  • Record last updated2007 · 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 Santa Cruz → Ophthalmology Physician nationwide →

The 8 ophthalmology physician records with the nearest ZIP codes

  1. Craig Blackwell, MDSanta Cruz, CA 950651326041195
  2. Rex Hsei, MDSanta Cruz, CA 950651285637157
  3. Andrew Zhou, MDSanta Cruz, CA 950651245694959
  4. Joshua Babad, M.D.Santa Cruz, CA 950621902801939
  5. Robert Jones, M.D.Santa Cruz, CA 950621881738128
  6. Anna Kesler-Diaz, MDSanta Cruz, CA 950621477767648
  7. Jason Luksich, MDSanta Cruz, CA 950621225110810
  8. Robert RosenSanta Cruz, CA 950621093785123

Common questions

What is Samuel S. Masters, M.D.'s NPI number?

Samuel S. Masters, M.D.'s National Provider Identifier (NPI) is 1265588784, issued on Jan 26, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Samuel S. Masters, M.D. located?

The NPPES record lists a practice address at 1663 Dominican Way, Santa Cruz, CA, 95065. Phone: (831) 475-5375. Providers update this record themselves, so call before visiting.

How can I verify Samuel S. Masters, M.D.'s license?

NPPES lists California license number G55792, 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 Samuel S. Masters, M.D. prescribe under Medicare Part D?

In 2024, Samuel S. Masters, M.D. had 256 Medicare Part D claims for 58 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.