Chi Mong Christopher Or, MD
Ophthalmology Physician · Stanford, CA
Chi Mong Christopher Or, MD is an ophthalmology physician with a practice address in Stanford, California, and NPI 1639676000, issued on Apr 11, 2018. Check the license (California A172845, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Chi Mong Christopher Or
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A172845 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Apr 11, 2018
- Record last updated
- Nov 21, 2025
- Medicare enrollment
- Enrolled (PECOS I20210622001716); accepts 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 Chi Mong Christopher Or in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A172845Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average ophthalmology physician in 2024
904 Medicare Part D claims for 264 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Latanoprost258 claims
- Dorzolamide-Timolol155 claims
- Prednisolone Acetate54 claims
- Prednisone40 claims
- Brimonidine Tartrate31 claims
- Restasis30 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: $2,723.81
33 payments; by number, the most common kind was food and beverage; the largest payer was Ani Pharmaceuticals, 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.
2 hospitals and group practices
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
- University Healthcare AllianceMenlo Park, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Chi Mong Christopher Or among 2,899 ophthalmology physician records in California
Chi Mong Christopher Or, MD 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 2018, is newer than 90% of them.
- NPI issued2018 · 90% of these records are older, 8% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2015 · 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).
53 ophthalmology physician records list a practice address in Stanford
They are 53 of the 5,606 NPPES records with a practice address in Stanford, and 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Stanford → 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 Chi Mong Christopher Or, MD's NPI number?
Chi Mong Christopher Or, MD's National Provider Identifier (NPI) is 1639676000, issued on Apr 11, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Chi Mong Christopher Or, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Chi Mong Christopher Or, MD's license?
NPPES lists California license number A172845, 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 Chi Mong Christopher Or, MD prescribe under Medicare Part D?
In 2024, Chi Mong Christopher Or, MD had 904 Medicare Part D claims for 264 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.