John J. Lah, MD
NPI 1437221272ActiveIndividual· Internal Medicine, Gastroenterology· Whittier, CA
Internal Medicine, Gastroenterology (MD) in Whittier, California, trained at New York Medical College (class of 2000). Their prescriptions cost Medicare Part D more than their services did: $107,703 for 349 claims, against $45,286 paid for services in 2024. Genzyme Corporation was the largest of 11 companies reporting payments in 2025, $1,325 in all, mostly food and beverage.
Overview
| NPI | 1437221272 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 15, 2006 |
| Last updated in NPPES | Oct 14, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A76371 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 183 |
|---|---|
| Services billed | 414 across 28 procedure codes |
| Paid by Medicare | $45,286 |
Part D prescriptions in 2024
| Prescriptions (claims) | 349 · 618 30-day fills |
|---|---|
| Patients | 138 |
| Total drug cost | $107,703 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | New York Medical College |
|---|---|
| Graduation year | 2000 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- United Medical DoctorsMurrieta, CA · 173 clinicians
Hospital affiliations
- Memorialcare Long Beach Medical CenterLong Beach, CA
- Uci Health-OrangeOrange, CA
Industry payments (Open Payments)
- 2025$1,325 · 58 payments from 11 companies
- 2024$1,165 · 46 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $326.85 | 7 |
| Aimmune Therapeutics, Inc. | $288.74 | 16 |
| Abbvie Inc. | $248.87 | 12 |
| Janssen Biotech, Inc. | $177.68 | 7 |
| Pfizer Inc. | $152.75 | 9 |
What the 2025 payments were for
- Food and Beverage$1,325 · 58 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 16 gastroenterologists in Whittier · All gastroenterologists in California