Erwin Grussie
NPI 1679917561ActiveIndividual· Internal Medicine, Hematology· Los Angeles, CA
Internal Medicine, Hematology with Cedars-Sinai Medical Care Foundation and 1 other group, practicing in Los Angeles, California. Their prescriptions cost Medicare Part D more than their services did: $2,908,830 for 1,587 claims, against $535,142 paid for services in 2024. Exelixis Inc. was the largest of 4 companies reporting payments in 2025, $466.75 in all, mostly food and beverage. Lists Cedar-Sinai Marina del Rey Hospital and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1679917561 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Apr 22, 2013 |
| Last updated in NPPES | Oct 13, 2025 |
| Certified by provider | Oct 13, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology Primary | 207RH0000X | A138355 | CA |
| Internal Medicine, Hematology & Oncology | 207RH0003X | A138355 | 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 - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 515 |
|---|---|
| Services billed | 22,213 across 30 procedure codes |
| Paid by Medicare | $535,142 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,587 · 2,119 30-day fills |
|---|---|
| Patients | 220 |
| Total drug cost | $2,908,830 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 2008 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Medical Oncology |
| Telehealth | Offers telehealth |
Medical groups
- Cedars-Sinai Medical Care FoundationWest Hollywood, CA · 1,692 clinicians
- Providence Medical InstitutePark Ridge, IL · 288 clinicians
Hospital affiliations
- Cedar-Sinai Marina del Rey HospitalMarina Del Rey, CA
- Cedars-Sinai Medical CenterLos Angeles, CA
- Providence Saint Joseph Medical CtrBurbank, CA
- Saint John's Health CenterSanta Monica, CA
Industry payments (Open Payments)
- 2025$466.75 · 8 payments from 4 companies
- 2024$435.12 · 14 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exelixis Inc. | $336.61 | 3 |
| Daiichi Sankyo Inc. | $56.71 | 2 |
| Pfizer Inc. | $50.74 | 2 |
| Pulmonx Corporation | $22.69 | 1 |
What the 2025 payments were for
- Food and Beverage$436.10 · 7 payments
- Education$30.65 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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