Katherine Chen, MS
Ophthalmology Physician · Irvine, CA
Katherine Chen, MS is an ophthalmology physician with a practice address in Irvine, California, and NPI 1699237420, issued on Apr 1, 2019. Check the license (California A184907, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katherine Chen
- Credential
- MS
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- A184907 CA
125.076053 IL
Self-reported in NPPES; status is on the state search - Practice location
- 850 Health Sciences RD, Irvine, CA 92697
- Phone
- (949) 824-7105
- Enumerated
- Apr 1, 2019
- Entity
- Type 1 · individual
Also registered at 850 Health Sciences RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashraf Ahmad, M.D.Ophthalmology Physician1689108425
- Yosur AlsulaimanOphthalmology Physician1457204661
- Andrew Browne, M.D., PH.D.Retina Specialist (Ophthalmology) Physician1154615383
- Teresa Chen, MDOphthalmology Physician1679034367
- Katherine Chuang, MDOphthalmology Physician1356831929
- Robert Crow, MDNeuro-ophthalmology Physician1285646398
Verify Katherine Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A184907Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
20% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,212 Medicare Part D claims for 354 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 57% of claims.
Most prescribed
- Prednisolone Acetate196 claims
- Moxifloxacin141 claims
- Restasis99 claims
- Xiidra72 claims
- Dorzolamide-Timolol70 claims
- Cequa55 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: $1,512.14
12 payments, mostly food and beverage; the largest payer was New World Medical,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
- Eye Physicians OF The East Bay Medical CorporationOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.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 Katherine Chen, MS's NPI number?
Katherine Chen, MS's National Provider Identifier (NPI) is 1699237420, issued on Apr 1, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Chen, MS located?
The NPPES record lists a practice address at 850 Health Sciences RD, Irvine, CA, 92697. Phone: (949) 824-7105. Providers update this record themselves, so call before visiting.
How can I verify Katherine Chen, MS's license?
NPPES lists California license number A184907, 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 Katherine Chen, MS prescribe under Medicare Part D?
In 2024, Katherine Chen, MS had 1,212 Medicare Part D claims for 354 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), loaded Aug 27, 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) 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 27, 2026.