Lawrence Chung-Lun Chang, M.D.
Internal Medicine Physician · San Clemente, CA
Lawrence Chung-Lun Chang, M.D. is an internal medicine physician with a practice address in San Clemente, California, and NPI 1528046430, issued on Jan 3, 2006. Check the license (California A54221, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Lawrence Chung-Lun Chang
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A54221 CA
Self-reported in NPPES; status is on the state search - Practice location
- 665 Camino DE Los Mares, San Clemente, CA 92673
- Phone
- (949) 240-9664
- Enumerated
- Jan 3, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (949) 240-0327
- Medicare enrollment
- Enrolled (PECOS I20100220000411); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical Branch At Galveston, 1993
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 665 Camino DE Los Mares
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Lawrence Chung-Lun Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A54221Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average internal medicine physician in 2024
7,481 Medicare Part D claims for 566 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 264 claims were for opioids.
Most prescribed
- Atorvastatin Calcium368 claims
- Levothyroxine Sodium364 claims
- Amlodipine Besylate216 claims
- Simvastatin186 claims
- Azithromycin145 claims
- Losartan Potassium145 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: $559.26
10 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. 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.
16 internal medicine physician records list a practice address in San Clemente
They are 16 of the 969 NPPES records with a practice address in San Clemente, and 17,696 internal medicine physician records in California.
All 16 in San Clemente → All 17,696 in California → Every provider in San Clemente →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Lawrence Chung-Lun Chang, M.D.'s NPI number?
Lawrence Chung-Lun Chang, M.D.'s National Provider Identifier (NPI) is 1528046430, issued on Jan 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Lawrence Chung-Lun Chang, M.D. located?
The NPPES record lists a practice address at 665 Camino DE Los Mares, San Clemente, CA, 92673. Phone: (949) 240-9664. Providers update this record themselves, so call before visiting.
How can I verify Lawrence Chung-Lun Chang, M.D.'s license?
NPPES lists California license number A54221, 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 Lawrence Chung-Lun Chang, M.D. prescribe under Medicare Part D?
In 2024, Lawrence Chung-Lun Chang, M.D. had 7,481 Medicare Part D claims for 566 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.