Margaret Amy Chang, M.D.
Retina Specialist (Ophthalmology) Physician · Sacramento, CA
Margaret Amy Chang, M.D. is a retina specialist (ophthalmology) physician with a practice address in Sacramento, California, and NPI 1477504405, issued on May 15, 2006. Check the license (California A103453, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Margaret Amy Chang
- Credential
- M.D.
- Primary taxonomy
- Retina Specialist (Ophthalmology) Physician 207WX0107X
- License numbers
- A103453 CA
D64111 MD
Self-reported in NPPES; status is on the state search - Practice location
- 3939 J St, Sacramento, CA 95819
- Phone
- (916) 454-4861
- Enumerated
- May 15, 2006
- Record last updated
- Apr 2, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (916) 454-3603
- Medicare enrollment
- Enrolled (PECOS I20080710000812); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Columbia School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest retina specialist (ophthalmology) physician records → All 205 in California → Look up another NPI →
Also registered at 3939 J St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jessica Belding, CRNACertified Registered Nurse Anesthetist1295138840
- Richard Bowling, PAPhysician Assistant1114007085
- Wonjae Choi, M.D.Anesthesiology Physician1093766982
- Cully Cobb, M.D.Neurological Surgery Physician1770502163
- David Cupp, MDRetina Specialist (Ophthalmology) Physician1497901565
- Justin English, M.D.Family Medicine Physician1942276431
Verify Margaret Amy Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A103453Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6% fewer Medicare Part D claims than the average retina specialist (ophthalmology) physician in 2024
581 Medicare Part D claims for 207 beneficiaries, against an average of 620 among the 1,449 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of claims.
Most prescribed
- Ketorolac Tromethamine201 claims
- Prednisolone Acetate122 claims
- Ofloxacin95 claims
- Latanoprost50 claims
- Brimonidine Tartrate20 claims
- Dorzolamide Hcl14 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $68,719.85
72 payments; by number, the most common kind was food and beverage; the largest payer was Genentech, Inc. The 1,253 providers of this specialty with any payment received $7,667.49 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
- Vitreo-Retinal Medical Group, Inc.Yuba City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Amy Chang among 205 retina specialist (ophthalmology) physician records in California
Margaret Amy Chang, M.D. is one of 205 retina specialist (ophthalmology) physician records with a practice address in California. 98% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 65% newer
- In a Medicare fileYes · 98% of these records are
- In the CMS Doctors and Clinicians fileYes · 92% of these records are
- Graduated2002 · median 2007 among the 189 with a school on file
- Record last updated2017 · 37% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207WX0107X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Retina Specialist (Ophthalmology) Physician providers in California
There are 205 retina specialist (ophthalmology) physician records in California.
All 205 in California → Every provider in Sacramento → Retina Specialist (Ophthalmology) Physician nationwide →
The 8 retina specialist (ophthalmology) physician records with the nearest ZIP codes
- David Cupp, MDSacramento, CA 958191497901565
- Robert Equi, M.D.Sacramento, CA 958191497864664
- Carlos Medina Mendez, M.D.Sacramento, CA 958191811218316
- Arun Patel, M.D.Sacramento, CA 958191164531430
- Joel Pearlman, M.D., PH.DSacramento, CA 958191154430460
- John Reed, M.D.Sacramento, CA 958191528177706
- David Telander, M.D., PH.DSacramento, CA 958191528043023
- Tony Tsai, M.D.Sacramento, CA 958191548294101
Common questions
What is Margaret Amy Chang, M.D.'s NPI number?
Margaret Amy Chang, M.D.'s National Provider Identifier (NPI) is 1477504405, issued on May 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Amy Chang, M.D. located?
The NPPES record lists a practice address at 3939 J St, Sacramento, CA, 95819. Phone: (916) 454-4861. Providers update this record themselves, so call before visiting.
How can I verify Margaret Amy Chang, M.D.'s license?
NPPES lists California license number A103453, 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 Margaret Amy Chang, M.D. prescribe under Medicare Part D?
In 2024, Margaret Amy Chang, M.D. had 581 Medicare Part D claims for 207 beneficiaries; the average among retina specialist (ophthalmology) physician prescribers was 620. Part D covers Medicare prescriptions only.
What is Margaret Amy Chang, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.