John Nesemann, MD, MSC
Ophthalmology Physician · San Francisco, CA
John Nesemann, MD, MSC is an ophthalmology physician with a practice address in San Francisco, California, and NPI 1124777586, issued on Mar 22, 2022. Check the license (California A189201, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Nesemann
- Credential
- MD, MSC
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A189201 CA
Self-reported in NPPES; status is on the state search - Practice location
- 513 Parnassus Ave # S321, San Francisco, CA 94143
- Phone
- (415) 476-1239
- Enumerated
- Mar 22, 2022
- Record last updated
- Jun 29, 2026
- Medicare enrollment
- Enrolled (PECOS I20260423000939); may accept Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2022
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Nesemann in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A189201Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $94.75
1 payment: food and beverage; the largest payer was Abbvie 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.
John Nesemann among 2,899 ophthalmology physician records in California
John Nesemann, MD, MSC 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 2022, is newer than 98% of them.
- NPI issued2022 · 98% of these records are older, under 1% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2022 · median 2001 among the 1,907 with a school on file
- Record last updated2026 · 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 Francisco → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Nisha Acharya, M.D.San Francisco, CA 941431972544872
- Robert Bhisitkul, MDSan Francisco, CA 941431831138676
- Joseph Crawford, MDSan Francisco, CA 941431831141712
- Eugene De Juan, MDSan Francisco, CA 941431043262074
- Jacque Duncan, MDSan Francisco, CA 941431942252978
- Allan Flach, MDSan Francisco, CA 941431043261134
- Jonathan Horton, MDSan Francisco, CA 941431992757363
- David Hwang, MDSan Francisco, CA 941431346292224
Common questions
What is John Nesemann, MD, MSC's NPI number?
John Nesemann, MD, MSC's National Provider Identifier (NPI) is 1124777586, issued on Mar 22, 2022. An NPI identifies a provider in billing; it is not a license.
Where is John Nesemann, MD, MSC located?
The NPPES record lists a practice address at 513 Parnassus Ave # S321, San Francisco, CA, 94143. Phone: (415) 476-1239. Providers update this record themselves, so call before visiting.
How can I verify John Nesemann, MD, MSC's license?
NPPES lists California license number A189201, 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.
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.