David F. Chang, M.D.
Ophthalmology Physician · Los Altos, CA
David F. Chang, M.D. is an ophthalmology physician with a practice address in Los Altos, California, and NPI 1316966138, issued on Jul 19, 2006. Check the license (California G045581, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David F. Chang
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G045581 CA
Self-reported in NPPES; status is on the state search - Practice location
- 762 Altos Oaks Dr, Los Altos, CA 94024
- Phone
- (650) 948-9123
- Enumerated
- Jul 19, 2006
- Record last updated
- May 5, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (650) 948-0563
- Medicaid ID
- 00G455810 CA
- Medicare enrollment
- Enrolled (PECOS I20100331000256); may accept Medicare assignment
- Medical or professional school
- Harvard Medical School, 1980
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 762 Altos Oaks Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephanie Chen, MDCornea and External Diseases Specialist Physician1629572136
- Ajita Grewal, M.D.Ophthalmology Physician1669491486
- Bryan Lee, MD, JDOphthalmology Physician1437336609
- Alejandro Zaffaroni, M.D.Ophthalmology Physician1316963507
Verify David F. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G045581Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average ophthalmology physician in 2024
539 Medicare Part D claims for 211 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims.
Most prescribed
- Diclofenac Sodium173 claims
- Prednisolone Acetate128 claims
- Polymyxin B Sul-Trimethoprim54 claims
- Loteprednol Etabonate38 claims
- Timolol Maleate25 claims
- Prosol23 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $11,616.88
19 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Research LLC. 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
- David F Chang M D IncLos Altos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David F. Chang among 2,899 ophthalmology physician records in California
David F. Chang, 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 fileYes · 66% of these records are
- Graduated1980 · median 2001 among the 1,907 with a school on file
- Record last updated2015 · 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).
7 ophthalmology physician records list a practice address in Los Altos
They are 7 of the 718 NPPES records with a practice address in Los Altos, and 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Los Altos → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Ajita Grewal, M.D.Los Altos, CA 940241669491486
- Bryan Lee, MD, JDLos Altos, CA 940241437336609
- Alejandro Zaffaroni, M.D.Los Altos, CA 940241316963507
- Sonja Declercq, MDMenlo Park, CA 940251508871187
- Jack Kabak, M.D.Menlo Park, CA 940251386735249
- Gilbert Kliman, M.D.Menlo Park, CA 940251578771671
- Donna Lee, MDMenlo Park, CA 940251235193970
- George Nakano, MPH, M.D.Menlo Park, CA 940251568553428
Common questions
What is David F. Chang, M.D.'s NPI number?
David F. Chang, M.D.'s National Provider Identifier (NPI) is 1316966138, issued on Jul 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is David F. Chang, M.D. located?
The NPPES record lists a practice address at 762 Altos Oaks Dr, Los Altos, CA, 94024. Phone: (650) 948-9123. Providers update this record themselves, so call before visiting.
How can I verify David F. Chang, M.D.'s license?
NPPES lists California license number G045581, 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 David F. Chang, M.D. prescribe under Medicare Part D?
In 2024, David F. Chang, M.D. had 539 Medicare Part D claims for 211 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is David F. Chang, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.