Karen Shih, M.D.
Ophthalmology Physician · Sunnyvale, CA
Karen Shih, M.D. is an ophthalmology physician with a practice address in Sunnyvale, California, and NPI 1750565982, issued on Dec 24, 2007. Check the license (California A93631, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen Shih
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A93631 CA
Self-reported in NPPES; status is on the state search - Practice location
- 323 N Mathilda Ave, Sunnyvale, CA 94085
- Phone
- (408) 524-5900
- Enumerated
- Dec 24, 2007
- Record last updated
- Dec 7, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20081111000776); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2004
- Entity
- Type 1 · individual
Also registered at 323 N Mathilda Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jill Ackerman, MDOphthalmology Physician1760585228
- Jerry Lai, M.D.Ophthalmology Physician1720205917
- Trennda Rittenbach, O.D.Optometrist1427207497
- Carol Winton, MDOphthalmology Physician1891877106
Verify Karen Shih in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A93631Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% more Medicare Part D claims than the average ophthalmology physician in 2024
2,809 Medicare Part D claims for 542 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of claims.
Most prescribed
- Latanoprost460 claims
- Diclofenac Sodium391 claims
- Prednisolone Acetate388 claims
- Brimonidine Tartrate333 claims
- Ofloxacin264 claims
- Dorzolamide-Timolol193 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: $40.98
1 payment: food and beverage; the largest payer was Johnson & Johnson Surgical Vision, 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.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationLos Altos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (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 13 in Sunnyvale → All 2,899 in California → Every provider in Sunnyvale →
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 Karen Shih, M.D.'s NPI number?
Karen Shih, M.D.'s National Provider Identifier (NPI) is 1750565982, issued on Dec 24, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Karen Shih, M.D. located?
The NPPES record lists a practice address at 323 N Mathilda Ave, Sunnyvale, CA, 94085. Phone: (408) 524-5900. Providers update this record themselves, so call before visiting.
How can I verify Karen Shih, M.D.'s license?
NPPES lists California license number A93631, 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 Karen Shih, M.D. prescribe under Medicare Part D?
In 2024, Karen Shih, M.D. had 2,809 Medicare Part D claims for 542 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.