Ernest Chang, OD
Optometrist · Woodland, CA
Ernest Chang, OD is an optometrist with a practice address in Woodland, California, and NPI 1235786898, issued on Aug 19, 2019. Check the license (California 34341, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Ernest Chang
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 34341 CA
Self-reported in NPPES; status is on the state search - Practice location
- 421 Pioneer Ave, Woodland, CA 95776
- Phone
- (530) 661-0300
- Enumerated
- Aug 19, 2019
- Record last updated
- Aug 23, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20191004000490); accepts Medicare assignment
- Medical or professional school
- Pacific University - College Of Optometry, 2019
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Verify Ernest Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 34341Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average optometrist in 2024
36 Medicare Part D claims for 22 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 47% of 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: $444.57
4 payments; by number, the most common kind was food and beverage; the largest payer was Johnson & Johnson Vision Care, Inc. The 34,453 providers of this specialty with any payment received $769.99 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
- Regents OF The University OF CaliforniaSacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ernest Chang among 8,308 optometrist records in California
Ernest Chang, OD is one of 8,308 optometrist records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 81% of them.
- NPI issued2019 · 81% of these records are older, 16% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2019 · median 2008 among the 3,573 with a school on file
- Record last updated2019 · 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 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in California
There are 8,308 optometrist records in California.
All 8,308 in California → Every provider in Woodland → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Amy Brown, ODWoodland, CA 957761265508576
- Thomas Fong, ODWoodland, CA 957761235750449
- Kali Leonard, ODWoodland, CA 957761114099157
- Ellen Liebowitz, ODWoodland, CA 957761194897132
- Selene Lum, O.D.Woodland, CA 957761881825958
- Chao SunWoodland, CA 957761043669062
- Elizabeth Boliard, ODRocklin, CA 957651124736178
- Jerome Brendel, O.D.Rocklin, CA 957651831189620
Common questions
What is Ernest Chang, OD's NPI number?
Ernest Chang, OD's National Provider Identifier (NPI) is 1235786898, issued on Aug 19, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Ernest Chang, OD located?
The NPPES record lists a practice address at 421 Pioneer Ave, Woodland, CA, 95776. Phone: (530) 661-0300. Providers update this record themselves, so call before visiting.
How can I verify Ernest Chang, OD's license?
NPPES lists California license number 34341, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Ernest Chang, OD prescribe under Medicare Part D?
In 2024, Ernest Chang, OD had 36 Medicare Part D claims for 22 beneficiaries; the average among optometrist prescribers was 277. 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.