Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

John Nesemann, MD, MSC

Individual provider Ophthalmology Physician · NPI 1124777586

John Nesemann, MD, MSC practises Ophthalmology in San Francisco, California. Graduated from University of California, Geffen School of Medicine in 2022, 4 years ago. Works from 3 locations. Licensed in California.

Years since qualifying
4
Trained at
University of California, Geffen School of Medicine
Licensed in
CA
In the registry since
2022
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

513 Parnassus Ave # S321
San Francisco, CA 94143-2205
Phone: (415) 476-1239
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 1001 Potrero Avenue, San Francisco, CA 94110-3510 — (628) 206-8025
  • 490 Illinois Street, San Francisco, CA 94158 — (415) 353-2020

Specialties & licences

Ophthalmology Physician (primary) Taxonomy 207W00000X · Licence A189201 (CA)

Record details

NPI number1124777586
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , MSC
Sole proprietorNo
NPI enumeratedMarch 22, 2022
Last updated in NPPESJune 29, 2026
Certification dateJune 29, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOPHTHALMOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, GEFFEN SCHOOL OF MEDICINE
Graduated 2022 (4 years in practice)
Accepts Medicare assignment Not indicated
Practice locations3 on file with Medicare

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $277 2 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

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