John S. Marshburn, M.D.
Ophthalmology Physician · Placentia, CA
John S. Marshburn, M.D. is an ophthalmology physician with a practice address in Placentia, California, and NPI 1245246164, issued on Jul 31, 2006. Check the license (California A60789, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John S. Marshburn
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A60789 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1275 N Rose Dr, Placentia, CA 92870
- Phone
- (714) 792-1199
- Enumerated
- Jul 31, 2006
- Record last updated
- Nov 28, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (714) 792-1196
- Medicare enrollment
- Enrolled (PECOS I20080208000561); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 1993
- Entity
- Type 1 · individual
Also registered at 1275 N Rose Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Pauline Ho, M.D.Specialist1194854794
- Ali Houshyar, MDInternal Medicine Physician1568434595
- Peter Kwon, M.D.Internal Medicine Physician1003840471
- Melanie Reed, D.P.M.Podiatrist1427034370
- Kenneth Schemmer, M.D.Specialist1619066867
- Carol Schreiber, N.P.Hospice and Palliative Medicine (Obstetrics & Gynecology) Physician1548482284
Verify John S. Marshburn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A60789Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% more Medicare Part D claims than the average ophthalmology physician in 2024
2,705 Medicare Part D claims for 566 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 47% of claims.
Most prescribed
- Latanoprost951 claims
- Lumigan261 claims
- Timolol Maleate194 claims
- Dorzolamide-Timolol186 claims
- Dorzolamide Hcl140 claims
- Alphagan P89 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
Other ophthalmology physician records in California
- Sam Abbassi, MD, MSWest Hills, CA1881937720
- Richard Abbott, M.D.San Francisco, CA1346276573
- Jean-Paul Abboud, M.D., PH.D.Del Mar, CA1760776728
- Nizar Abdelfattah, MDPasadena, CA1801359393
- Parastou Abedi, MDAliso Viejo, CA1720067333
- Shahla Abedi, MDAliso Viejo, CA1467431072
- Lilit Ablabutyan, M.D.Glendale, CA1497013064
- Nathan Abraham, M.D.Valencia, CA1306224456
- James Abrams, M.D.San Bruno, CA1912903329
- Adam Abroms, MDWestlake Village, CA1497743702
Common questions
What is John S. Marshburn, M.D.'s NPI number?
John S. Marshburn, M.D.'s National Provider Identifier (NPI) is 1245246164, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John S. Marshburn, M.D. located?
The NPPES record lists a practice address at 1275 N Rose Dr, Placentia, CA, 92870. Phone: (714) 792-1199. Providers update this record themselves, so call before visiting.
How can I verify John S. Marshburn, M.D.'s license?
NPPES lists California license number A60789, 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 John S. Marshburn, M.D. prescribe under Medicare Part D?
In 2024, John S. Marshburn, M.D. had 2,705 Medicare Part D claims for 566 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is John S. Marshburn, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.