Charles Y. Chang, MD
Urology Physician · Concord, CA
Charles Y. Chang, MD is a urology physician with a practice address in Concord, California, and NPI 1942436886, issued on Jun 5, 2009. Check the license (California C166684, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Charles Y. Chang
- Credential
- MD
- Primary taxonomy
- Urology Physician 208800000X
- License numbers
- C166684 CA
125054599 IL
314844 NY
MD60462997 WA
Self-reported in NPPES; status is on the state search - Practice location
- 2222 East St Ste 250, Concord, CA 94520
- Phone
- (925) 609-7220
- Enumerated
- Jun 5, 2009
- Record last updated
- Dec 12, 2024
- Medicare enrollment
- Enrolled (PECOS I20241219002098); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 2222 East St Ste 250
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jesse Le, M.D.Urology Physician1457679201
- Kathy Nguyen, FNPFamily Nurse Practitioner1700459583
- Wei Zheng, M.D.Urology Physician1881601789
Verify Charles Y. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C166684Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% fewer Medicare Part D claims than the average urology physician in 2024
1,021 Medicare Part D claims for 249 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Tamsulosin Hcl383 claims
- Oxybutynin Chloride Er118 claims
- Myrbetriq109 claims
- Alfuzosin Hcl Er107 claims
- Finasteride81 claims
- Lupron Depot53 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.
Bills Medicare through one group practice
- John Muir Physician NetworkConcord, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Urology Physician providers in California
There are 1,524 urology physician records in California.
Other urology physician records in California
- David Aaronson, MDOakland, CA1215053129
- Jason Abber, MDPanorama City, CA1356366926
- Marc Abboud, MDLos Alamitos, CA1265096531
- George AbdelsayedAnaheim, CA1568721843
- Garen AbediDowney, CA1285909051
- Jennifer Abidari, MDStanford, CA1811098197
- Sherif Aboseif, MDOxnard, CA1093882995
- Parwiz Abrahimi, M.D., PH.D.Los Angeles, CA1154857613
- Anthony Acquaviva, MDVallejo, CA1457439283
- Theodore Affue, M.D.El Centro, CA1386674000
Common questions
What is Charles Y. Chang, MD's NPI number?
Charles Y. Chang, MD's National Provider Identifier (NPI) is 1942436886, issued on Jun 5, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Charles Y. Chang, MD located?
The NPPES record lists a practice address at 2222 East St Ste 250, Concord, CA, 94520. Phone: (925) 609-7220. Providers update this record themselves, so call before visiting.
How can I verify Charles Y. Chang, MD's license?
NPPES lists California license number C166684, 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 Charles Y. Chang, MD prescribe under Medicare Part D?
In 2024, Charles Y. Chang, MD had 1,021 Medicare Part D claims for 249 beneficiaries; the average among urology physician prescribers was 1,340. 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.