Chad York Lewis, MD, MPH
Ophthalmology Physician · Palo Alto, CA
Chad York Lewis, MD, MPH is an ophthalmology physician with a practice address in Palo Alto, California, and NPI 1407424187, issued on Jun 17, 2021. Check the license (California A2029132, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Chad York Lewis
- Credential
- MD, MPH
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- A2029132 CA
R-12259 IA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Palo Alto, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Jun 17, 2021
- Record last updated
- Jul 7, 2025
- Medicare enrollment
- Enrolled (PECOS I20250618003139); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Chad York Lewis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A2029132Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average ophthalmology physician in 2024
180 Medicare Part D claims for 84 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Ketorolac Tromethamine21 claims
- Latanoprost19 claims
- Dorzolamide-Timolol16 claims
- Brimonidine Tartrate11 claims
- Prednisolone Acetate11 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.
Chad York Lewis among 2,899 ophthalmology physician records in California
Chad York Lewis, MD, MPH 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 2021, is newer than 96% of them.
- NPI issued2021 · 96% of these records are older, 2% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2021 · median 2001 among the 1,907 with a school on file
- Record last updated2025 · 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 Palo Alto → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Mark Blumenkranz, M.D.Stanford, CA 943051114085636
- Clement Cheng, MDStanford, CA 943051629065826
- Jason Ehrlich, M.D., PH.D.Stanford, CA 943051447446752
- Ann Fisher, MDStanford, CA 943051861417636
- Henry Kistler, M.D., PH.D.Stanford, CA 943051508992108
- Vinit Mahajan, MD PHDStanford, CA 943051497784300
- Michael Marmor, M.D.Stanford, CA 943051225181662
- Artis Montague, MD, PHDStanford, CA 943051679680086
Common questions
What is Chad York Lewis, MD, MPH's NPI number?
Chad York Lewis, MD, MPH's National Provider Identifier (NPI) is 1407424187, issued on Jun 17, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Chad York Lewis, MD, MPH located?
The NPPES record lists a practice address at 300 Pasteur Dr, Palo Alto, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Chad York Lewis, MD, MPH's license?
NPPES lists California license number A2029132, 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 Chad York Lewis, MD, MPH prescribe under Medicare Part D?
In 2024, Chad York Lewis, MD, MPH had 180 Medicare Part D claims for 84 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.