Bayard Won Chang, M.D.
Internal Medicine Physician · Sacramento, CA
Bayard Won Chang, M.D. is an internal medicine physician with a practice address in Sacramento, California, and NPI 1104816255, issued on Oct 28, 2005. Check the license (California G064347, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Bayard Won Chang
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G064347 CA
Self-reported in NPPES; status is on the state search - Practice location
- 500 University Ave, Sacramento, CA 95825
- Phone
- (916) 929-2526
- Enumerated
- Oct 28, 2005
- Record last updated
- Jan 25, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (916) 929-6128
- Medicare enrollment
- Enrolled (PECOS I20051014000811); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 500 University Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Bayard Won Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G064347Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
7,054 Medicare Part D claims for 407 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 220 claims were for opioids.
Most prescribed
- Atorvastatin Calcium412 claims
- Amlodipine Besylate291 claims
- Zolpidem Tartrate198 claims
- Levothyroxine Sodium186 claims
- Pantoprazole Sodium147 claims
- Eliquis146 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 MIPS final score for 2023 (Medicare payment program): 78.5 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $434.99
19 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Bayard Won Chang among 17,696 internal medicine physician records in California
Bayard Won Chang, M.D. is one of 17,696 internal medicine 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1987 · median 2004 among the 11,065 with a school on file
- Record last updated2008 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
601 internal medicine physician records list a practice address in Sacramento
They are 601 of the 33,083 NPPES records with a practice address in Sacramento, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sacramento → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Anjali Chanana Gupta, M.D.Sacramento, CA 958251316042948
- Sunita Jain, M.D.Sacramento, CA 958251184691974
- Eliot Mah, MDSacramento, CA 958251982782660
- John Morelli, M.DSacramento, CA 958251841386653
- Philip Poor, M.D.Sacramento, CA 958251013022433
Common questions
What is Bayard Won Chang, M.D.'s NPI number?
Bayard Won Chang, M.D.'s National Provider Identifier (NPI) is 1104816255, issued on Oct 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Bayard Won Chang, M.D. located?
The NPPES record lists a practice address at 500 University Ave, Sacramento, CA, 95825. Phone: (916) 929-2526. Providers update this record themselves, so call before visiting.
How can I verify Bayard Won Chang, M.D.'s license?
NPPES lists California license number G064347, 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 Bayard Won Chang, M.D. prescribe under Medicare Part D?
In 2024, Bayard Won Chang, M.D. had 7,054 Medicare Part D claims for 407 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Bayard Won Chang, M.D.'s MIPS final score?
The 2023 MIPS final score is 78.5 of 100. 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.