David Bruce Mark, M.D.
Ophthalmology Physician · Sunnyvale, CA
David Bruce Mark, M.D. is an ophthalmology physician with a practice address in Sunnyvale, California, and NPI 1912900218, issued on May 31, 2005. Check the license (California G35305, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David Bruce Mark
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G35305 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1010 W Fremont Ave, Sunnyvale, CA 94087
- Phone
- (408) 739-6200
- Enumerated
- May 31, 2005
- Record last updated
- Jan 31, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (408) 739-2439
- Medicaid ID
- 9533828 CA
- Medicare enrollment
- Enrolled (PECOS I20040610001314); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 1976
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 1010 W Fremont Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jesley Johnson, O.D.Optometrist1265792253
- Sean Kao, ODOptometrist1760220305
- Moshe Mendelson, O.D.Optometrist1366443277
- Vyoma Shinde, ODOptometrist1659064335
- Kevin Wu, ODOptometrist1396221172
Verify David Bruce Mark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G35305Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average ophthalmology physician in 2024
456 Medicare Part D claims for 129 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 49% of claims.
Most prescribed
- Latanoprost196 claims
- Timolol Maleate65 claims
- Tobramycin-Dexamethasone38 claims
- Prednisolone Acetate32 claims
- Brimonidine Tartrate14 claims
- Acyclovir12 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.
Bills Medicare through one group practice
- Mendelson And Mark Optometric CorporationSunnyvale, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David Bruce Mark among 2,899 ophthalmology physician records in California
David Bruce Mark, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1976 · median 2001 among the 1,907 with a school on file
- Record last updated2013 · 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).
13 ophthalmology physician records list a practice address in Sunnyvale
They are 13 of the 1,690 NPPES records with a practice address in Sunnyvale, and 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Sunnyvale → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Tayyeba Ali, M.D.Sunnyvale, CA 940871891947925
- Wanda Hu, M.D.Sunnyvale, CA 940871972803666
- Sheila Town, M.D.Mountain View, CA 940871205910494
- Yachna Ahuja, MDSunnyvale, CA 940861144479221
- Jill Ackerman, MDSunnyvale, CA 940851760585228
- Barbara Erny, MDSunnyvale, CA 940851992803514
- Tanya Ghosh, MDSunnyvale, CA 940851417045600
- Jerry Lai, M.D.Sunnyvale, CA 940851720205917
Common questions
What is David Bruce Mark, M.D.'s NPI number?
David Bruce Mark, M.D.'s National Provider Identifier (NPI) is 1912900218, issued on May 31, 2005. An NPI identifies a provider in billing; it is not a license.
Where is David Bruce Mark, M.D. located?
The NPPES record lists a practice address at 1010 W Fremont Ave, Sunnyvale, CA, 94087. Phone: (408) 739-6200. Providers update this record themselves, so call before visiting.
How can I verify David Bruce Mark, M.D.'s license?
NPPES lists California license number G35305, 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 David Bruce Mark, M.D. prescribe under Medicare Part D?
In 2024, David Bruce Mark, M.D. had 456 Medicare Part D claims for 129 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.
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.