William Weiming Chang, D.O.
Pulmonary Disease Physician · San Juan Capistrano, CA
William Weiming Chang, D.O. is a pulmonary disease physician with a practice address in San Juan Capistrano, California, and NPI 1417902149, issued on May 23, 2006. Check the license (California 20A7942, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Weiming Chang
- Credential
- D.O.
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- 20A7942 CA
Self-reported in NPPES; status is on the state search - Practice location
- 30230 Rancho Viejo RD, San Juan Capistrano, CA 92675
- Phone
- (714) 571-5000
- Enumerated
- May 23, 2006
- Record last updated
- Apr 17, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (714) 571-5055
- Medicare enrollment
- Enrolled (PECOS I20070510000320); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 2000
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 1,443 in California → Look up another NPI →
Also registered at 30230 Rancho Viejo RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Patricia Ahearn, M.D.Internal Medicine Physician1982655304
- Karen Caruso, MSN, RN, FNP-BCFamily Nurse Practitioner1679816680
- Yu-Hua Fang, M.D.Internal Medicine Physician1881647642
- William Gustin, MDHospitalist Physician1457431504
- Beverly Hendrickson, MDPediatrics Physician1306910906
- Rahul Kale, MDPulmonary Disease Physician1447330915
Verify William Weiming Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A7942Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.6 times the Medicare Part D claims of the average pulmonary disease physician in 2024
5,085 Medicare Part D claims for 748 beneficiaries, against an average of 1,425 among the 11,596 providers of this specialty who prescribed in Part D.
Most prescribed
- Albuterol Sulfate Hfa745 claims
- Fluticasone Propionate423 claims
- Trelegy Ellipta325 claims
- Azelastine Hcl283 claims
- Prednisone227 claims
- Montelukast Sodium194 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): 95.8 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: $2,040.08
92 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 8,806 providers of this specialty with any payment received $5,159.88 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
- Paloma Medical Group IncLaguna Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Weiming Chang among 1,443 pulmonary disease physician records in California
William Weiming Chang, D.O. is one of 1,443 pulmonary disease physician records with a practice address in California. 84% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 51% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2000 · median 2002 among the 1,061 with a school on file
- Record last updated2013 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 pulmonary disease physician records list a practice address in San Juan Capistrano
They are 9 of the 676 NPPES records with a practice address in San Juan Capistrano, and 1,443 pulmonary disease physician records in California.
All 1,443 in California → Every provider in San Juan Capistrano → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- Rahul Kale, MDSan Juan Capistrano, CA 926751447330915
- Bryan King, M.D.San Juan Capistrano, CA 926751871785220
- Sanjivan Kohli, MDSan Juan Capistrano, CA 926751801129663
- Jay Patel, MDSan Juan Capistrano, CA 926751467834044
- Kaveh Rezvan, D.O.San Juan Capistrano, CA 926751003140922
- Michael Rovzar, M.D.San Juan Capistrano, CA 926751184675688
- Yen-Hui Soong, M.D.San Juan Capistrano, CA 926751942572680
- Inchel Yeam, M.D.San Juan Capistrano, CA 926751346341344
Common questions
What is William Weiming Chang, D.O.'s NPI number?
William Weiming Chang, D.O.'s National Provider Identifier (NPI) is 1417902149, issued on May 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Weiming Chang, D.O. located?
The NPPES record lists a practice address at 30230 Rancho Viejo RD, San Juan Capistrano, CA, 92675. Phone: (714) 571-5000. Providers update this record themselves, so call before visiting.
How can I verify William Weiming Chang, D.O.'s license?
NPPES lists California license number 20A7942, 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 Weiming Chang, D.O. prescribe under Medicare Part D?
In 2024, William Weiming Chang, D.O. had 5,085 Medicare Part D claims for 748 beneficiaries; the average among pulmonary disease physician prescribers was 1,425. Part D covers Medicare prescriptions only.
What is William Weiming Chang, D.O.'s MIPS final score?
The 2023 MIPS final score is 95.8 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.