William Yow Jung Chang, MD
Critical Care Medicine (Internal Medicine) Physician · Monterey Park, CA
William Yow Jung Chang, MD is a critical care medicine (internal medicine) physician with a practice address in Monterey Park, California, and NPI 1003236688, issued on Apr 22, 2014. Check the license (California A140305, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Yow Jung Chang
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- A140305 CA
Self-reported in NPPES; status is on the state search - Practice location
- 500 N Garfield Ave Ste 204, Monterey Park, CA 91754
- Phone
- (626) 280-4393
- Enumerated
- Apr 22, 2014
- Record last updated
- Aug 18, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20191010000984); accepts Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 2014
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 500 N Garfield Ave Ste 204
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Siyuan Jing, NPAcute Care Nurse Practitioner1114575115
- Than Kyaw, M.DCritical Care Medicine (Internal Medicine) Physician1659642767
- Jeng-Jong Liao, MDCritical Care Medicine (Internal Medicine) Physician1851442057
- Erick Lu, D.O.Pulmonary Disease Physician1417278359
- Wanting NgFamily Nurse Practitioner1952843609
- Kevin Nguyen, DOPulmonary Disease Physician1821655242
Verify William Yow Jung Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A140305Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average critical care medicine (internal medicine) physician in 2024
1,996 Medicare Part D claims for 296 beneficiaries, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D. Brand-name drugs were 64% of claims.
Most prescribed
- Trelegy Ellipta304 claims
- Albuterol Sulfate Hfa279 claims
- Montelukast Sodium200 claims
- Anoro Ellipta172 claims
- Breztri Aerosphere153 claims
- Fluticasone Propionate101 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: $1,940.64
65 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 2,708 providers of this specialty with any payment received $2,958.68 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
- Prestige Pulmonary Consultants IncMonterey Park, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in California
There are 723 critical care medicine (internal medicine) physician records in California.
Other critical care medicine (internal medicine) physician records in California
- Mariam Abdelkader, MDFresno, CA1689022824
- Hazem Abdelsalam, M.D.Torrance, CA1346793312
- Unknown Abdul Hameed Zaid, M.B,B.SLoma Linda, CA1679908800
- Glen Abergel, M.D.Oxnard, CA1093743924
- Ayham Aboeed, M.D.Bakersfield, CA1093969750
- Henry Abrons, M.D.Berkeley, CA1821001470
- Noman Absar, MDVallejo, CA1205908951
- Natalie Achamallah, M.D.West Hollywood, CA1255881546
- Cresencio AdamePalo Alto, CA1750021564
- Allen Adams, M.D.Los Angeles, CA1700862794
Common questions
What is William Yow Jung Chang, MD's NPI number?
William Yow Jung Chang, MD's National Provider Identifier (NPI) is 1003236688, issued on Apr 22, 2014. An NPI identifies a provider in billing; it is not a license.
Where is William Yow Jung Chang, MD located?
The NPPES record lists a practice address at 500 N Garfield Ave Ste 204, Monterey Park, CA, 91754. Phone: (626) 280-4393. Providers update this record themselves, so call before visiting.
How can I verify William Yow Jung Chang, MD's license?
NPPES lists California license number A140305, 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 William Yow Jung Chang, MD prescribe under Medicare Part D?
In 2024, William Yow Jung Chang, MD had 1,996 Medicare Part D claims for 296 beneficiaries; the average among critical care medicine (internal medicine) physician prescribers was 696. 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.