Jaesoo Pak, M.D.
NPI 1023124054ActiveIndividual· Internal Medicine, Gastroenterology· Cerritos, CA
Internal Medicine, Gastroenterology (M.D.) in Cerritos, California, trained at George Washington University School of Medicine (class of 1992). Their prescriptions cost Medicare Part D more than their services did: $7,079,568 for 18,864 claims, against $486,185 paid for services in 2024. Amgen Inc. was the largest of 14 companies reporting payments in 2025, $1,743 in all, mostly food and beverage.
Overview
| NPI | 1023124054 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 22, 2006 |
| Last updated in NPPES | Jul 9, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | G77845 | 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 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 458 |
|---|---|
| Services billed | 13,387 across 52 procedure codes |
| Paid by Medicare | $486,185 |
Part D prescriptions in 2024
| Prescriptions (claims) | 18,864 · 25,891 30-day fills |
|---|---|
| Patients | 545 |
| Total drug cost | $7,079,568 |
| Generic share | 55% of claims |
Education and affiliations
| Medical school | George Washington University School of Medicine |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Gastroenterology |
Medical group
- First Medical Center IncCerritos, CA · 3 clinicians
Industry payments (Open Payments)
- 2025$1,743 · 100 payments from 14 companies
- 2024$2,483 · 153 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $348.04 | 19 |
| Ardelyx, Inc. | $285.99 | 13 |
| Abbvie Inc. | $284.06 | 16 |
| Aimmune Therapeutics, Inc. | $195.97 | 13 |
| Ibsa Pharma Inc. | $195.81 | 20 |
What the 2025 payments were for
- Food and Beverage$1,743 · 100 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in Cerritos
- 1134297492
- 1023208154
All Internal Medicine, Gastroenterology providers in California →