Catherine Michele Knox, M.D.
Ophthalmology Physician · Union City, CA
Catherine Michele Knox, M.D. is an ophthalmology physician with a practice address in Union City, California, and NPI 1013095652, issued on Nov 1, 2006. Check the license (California A53994, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Catherine Michele Knox
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A53994 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3553 Whipple RD, Union City, CA 94587
- Phone
- (510) 454-1000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A539940 CA
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 3553 Whipple RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Catherine Michele Knox in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A53994Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average ophthalmology physician in 2024
58 Medicare Part D claims for 33 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D.
Most prescribed
- Latanoprost31 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.
Catherine Michele Knox among 2,899 ophthalmology physician records in California
Catherine Michele Knox, 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 45% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2021 · 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).
15 ophthalmology physician records list a practice address in Union City
They are 15 of the 1,006 NPPES records with a practice address in Union City, and 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Union City → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Kristina Austin, M.D.Union City, CA 945871417007238
- John Chan, M.D.Union City, CA 945871609928837
- Sung Choe, M.D.Union City, CA 945871689752446
- Kari Eisley, M.D.Union City, CA 945871457558884
- Michael Fang-Yen, M.D.Union City, CA 945871366520868
- Franklin Jeng, MDUnion City, CA 945871316560782
- James Lahey, M.D.Union City, CA 945871285712042
- Jeffrey Lehmer, M.D.Union City, CA 945871164500914
Common questions
What is Catherine Michele Knox, M.D.'s NPI number?
Catherine Michele Knox, M.D.'s National Provider Identifier (NPI) is 1013095652, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Michele Knox, M.D. located?
The NPPES record lists a practice address at 3553 Whipple RD, Union City, CA, 94587. Phone: (510) 454-1000. Providers update this record themselves, so call before visiting.
How can I verify Catherine Michele Knox, M.D.'s license?
NPPES lists California license number A53994, 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 Catherine Michele Knox, M.D. prescribe under Medicare Part D?
In 2024, Catherine Michele Knox, M.D. had 58 Medicare Part D claims for 33 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.