Nicholas L. Hartog, M.D.
NPI 1669766325ActiveIndividual· Allergy & Immunology· Grand Rapids, MI
Allergy & Immunology (M.D.) in Grand Rapids, Michigan, trained at Medical College of Wisconsin (class of 2011). Their prescriptions cost Medicare Part D more than their services did: $1,601,956 for 356 claims, against $8,965 paid for services in 2024. Takeda Pharmaceuticals U.S.A., Inc. was the largest of 16 companies reporting payments in 2025, $97,648 in all, mostly speaking and faculty fees.
Overview
| NPI | 1669766325 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 30, 2011 |
| Last updated in NPPES | Mar 17, 2021 |
| Certified by provider | Mar 17, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | 4301108955 | MI |
| Allergy & Immunology | 207K00000X | 2014010402 | MO |
| Internal Medicine | 207R00000X | R-9168 | IA |
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 - Allergy/Immunology (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 59 |
|---|---|
| Services billed | 214 across 13 procedure codes |
| Paid by Medicare | $8,965 |
Part D prescriptions in 2024
| Prescriptions (claims) | 356 · 606 30-day fills |
|---|---|
| Patients | 68 |
| Total drug cost | $1,601,956 |
| Generic share | 71% of claims |
Education and affiliations
| Medical school | Medical College of Wisconsin |
|---|---|
| Graduation year | 2011 |
| Medicare specialty | Allergy/Immunology |
| Telehealth | Offers telehealth |
Medical group
- Spectrum Health Primary Care PartnersGrand Rapids, MI · 2,294 clinicians
Hospital affiliations
- Corewell Health Ludington HospitalLudington, MI
- Spectrum HealthGrand Rapids, MI
Industry payments (Open Payments)
- 2025$97,648 · 174 payments from 16 companies
- 2024$179,690 · 202 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Takeda Pharmaceuticals U.S.A., Inc. | $48,298 | 61 |
| Pharming Healthcare, Inc. | $28,682 | 66 |
| Amgen Inc. | $19,960 | 23 |
| Grifols Shared Services North America, Inc. | $112.00 | 1 |
| Regeneron Healthcare Solutions, Inc. | $94.91 | 3 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$66,265 · 17 payments
- Consulting Fee$18,693 · 5 payments
- Travel and Lodging$10,144 · 83 payments
- Food and Beverage$2,530 · 68 payments
- Education$15.93 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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