Choon-Weng Chan, M.D.
Internal Medicine Physician · Elk Grove, CA
Choon-Weng Chan, M.D. is an internal medicine physician with a practice address in Elk Grove, California, and NPI 1528088937, issued on Jul 20, 2006. Check the license (California C129586, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Choon-Weng Chan
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- C129586 CA
227845 MA
Self-reported in NPPES; status is on the state search - Practice location
- 8220 Wymark Dr, Elk Grove, CA 95757
- Phone
- (916) 667-0600
- Enumerated
- Jul 20, 2006
- Record last updated
- Jul 10, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (916) 683-0232
- Medicare enrollment
- Enrolled (PECOS I20140918002469); accepts Medicare assignment
- 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 8220 Wymark Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Choon-Weng Chan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C129586Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average internal medicine physician in 2024
10,947 Medicare Part D claims for 666 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 247 claims were for opioids.
Most prescribed
- Atorvastatin Calcium945 claims
- Amlodipine Besylate623 claims
- Losartan Potassium388 claims
- Tamsulosin Hcl319 claims
- Lisinopril288 claims
- Metformin Hcl277 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): 96.5 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).
Bills Medicare through one group practice
- Dignity Health Medical FoundationElk Grove, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Choon-Weng Chan among 17,696 internal medicine physician records in California
Choon-Weng Chan, 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2001 · median 2004 among the 11,065 with a school on file
- Record last updated2014 · 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).
38 internal medicine physician records list a practice address in Elk Grove
They are 38 of the 3,596 NPPES records with a practice address in Elk Grove, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Elk Grove → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Pamela Apolaya-Smith, MDElk Grove, CA 957571942436597
- Gaurav Datta, MDElk Grove, CA 957571225184765
- Wajahat Khan, M.D.Elk Grove, CA 957571851393540
- Nina Khangura, M.D.Elk Grove, CA 957571023372059
- David Lee, M.D.Elk Grove, CA 957571003832346
- Mira Roganovic, M.D.Elk Grove, CA 957571033154448
- Muhammad Zubair, M.D.Elk Grove, CA 957571891755344
- Eddy Joelson, M.D.Elk Grove, CA 957581043294580
Common questions
What is Choon-Weng Chan, M.D.'s NPI number?
Choon-Weng Chan, M.D.'s National Provider Identifier (NPI) is 1528088937, issued on Jul 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Choon-Weng Chan, M.D. located?
The NPPES record lists a practice address at 8220 Wymark Dr, Elk Grove, CA, 95757. Phone: (916) 667-0600. Providers update this record themselves, so call before visiting.
How can I verify Choon-Weng Chan, M.D.'s license?
NPPES lists California license number C129586, 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 Choon-Weng Chan, M.D. prescribe under Medicare Part D?
In 2024, Choon-Weng Chan, M.D. had 10,947 Medicare Part D claims for 666 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Choon-Weng Chan, M.D.'s MIPS final score?
The 2023 MIPS final score is 96.5 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.