Jonathan Lo, MD
NPI 1164570941ActiveIndividual· Internal Medicine· Fontana, CA
Internal Medicine (MD) in Fontana, California, trained at Un of California, Irvine, College of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $35,100 for 438 claims, against $2,423 paid for services in 2024. Madrigal Pharmaceuticals reported $141.14 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1164570941 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 8, 2007 |
| Last updated in NPPES | Dec 2, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A66923 | 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 - Hospitalist (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 15 |
|---|---|
| Services billed | 41 across 4 procedure codes |
| Paid by Medicare | $2,423 |
Part D prescriptions in 2024
| Prescriptions (claims) | 438 · 855 30-day fills |
|---|---|
| Patients | 168 |
| Total drug cost | $35,100 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Un of California, Irvine, College of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Hospitalist |
| Secondary specialties | Internal Medicine |
Medical group
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
Hospital affiliation
- Kaiser Foundation Hospital Fontana/OntarioFontana, CA
Industry payments (Open Payments)
- 2025$141.14 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $141.14 | 1 |
What the 2025 payments were for
- Food and Beverage$141.14 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 118 internal medicine physicians in Fontana · All internal medicine physicians in California