Lawrence Chung-Lun Chang, M.D.
NPI 1528046430ActiveIndividual· Internal Medicine· San Clemente, CA
Internal Medicine (M.D.) in San Clemente, California, trained at University of Texas Medical Branch at Galveston (class of 1993). Their prescriptions cost Medicare Part D more than their services did: $563,320 for 7,481 claims, against $97,403 paid for services in 2024. Abbott Laboratories was the largest of 6 companies reporting payments in 2025, $268.94 in all, mostly food and beverage.
Overview
| NPI | 1528046430 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jan 3, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A54221 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 273 |
|---|---|
| Services billed | 1,186 across 12 procedure codes |
| Paid by Medicare | $97,403 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,481 · 16,496 30-day fills |
|---|---|
| Patients | 566 |
| Total drug cost | $563,320 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | University of Texas Medical Branch at Galveston |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Geriatric Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Memorialcare Saddleback Medical CenterLaguna Hills, CA
- Providence Mission HospitalMission Viejo, CA
Other facilities
- Acacia Hh&p of Southern California, LLCHome health agency · Irvine, CA
- Providence at Home With Compassus Home Health Orange CountyHome health agency · Anaheim, CA
- Providence at Home With Compassus Home Health, Orange County SouthHome health agency · Irvine, CA
Industry payments (Open Payments)
- 2025$268.94 · 7 payments from 6 companies
- 2024$559.26 · 10 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbott Laboratories | $125.31 | 1 |
| Exact Sciences Corporation | $49.94 | 2 |
| Lilly USA, LLC | $28.40 | 1 |
| Glaxosmithkline, LLC. | $24.91 | 1 |
| Amgen Inc. | $23.58 | 1 |
What the 2025 payments were for
- Food and Beverage$268.94 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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