John Shen, M.D.
NPI 1104183631ActiveIndividual· Internal Medicine, Hematology & Oncology· Los Angeles, CA
Internal Medicine, Hematology & Oncology (M.D.) in Los Angeles, California, licensed in CA, with an NPI issued in April 2012. Their prescriptions cost Medicare Part D more than their services did: $7,650,356 for 1,094 claims, against $897,574 paid for services in 2024. Onmark, Inc. was the largest of 2 companies reporting payments in 2025, $3,753 in all, mostly travel and lodging.
Overview
| NPI | 1104183631 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 23, 2012 |
| Last updated in NPPES | Aug 9, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A128805 | CA |
| Internal Medicine | 207R00000X | A128805 | CA |
| Internal Medicine, Geriatric Medicine | 207RG0300X | A128805 | 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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 432 |
|---|---|
| Services billed | 57,359 across 108 procedure codes |
| Paid by Medicare | $897,574 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,094 · 1,486 30-day fills |
|---|---|
| Patients | 151 |
| Total drug cost | $7,650,356 |
| Generic share | 47% of claims |
Industry payments (Open Payments)
- 2025$3,753 · 11 payments from 2 companies
- 2024$8,852 · 19 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Onmark, Inc. | $3,663 | 10 |
| Astrazeneca Pharmaceuticals LP | $90.15 | 1 |
What the 2025 payments were for
- Travel and Lodging$2,205 · 2 payments
- Food and Beverage$1,529 · 8 payments
- Gift$19.74 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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