Nicholas Maassen
NPI 1477718302ActiveIndividual· Orthopaedic Surgery· Chicago, IL
Orthopaedic Surgery in Chicago, Illinois, trained at University of Wisconsin School of Medicine (class of 2008). 244 Medicare patients in 2024, $60,095 paid; nearly all of their 136 Part D prescriptions were generic (99%). Restor3d, Inc. was the largest of 4 companies reporting payments in 2025, $5,506 in all, mostly consulting fees.
Overview
| NPI | 1477718302 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Jul 21, 2008 |
| Last updated in NPPES | Oct 24, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery Primary | 207X00000X | 036152536 | IL |
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 - Orthopedic Surgery (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 244 |
|---|---|
| Services billed | 643 across 27 procedure codes |
| Paid by Medicare | $60,095 |
Part D prescriptions in 2024
| Prescriptions (claims) | 136 · 136 30-day fills |
|---|---|
| Patients | 53 |
| Total drug cost | $428.63 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | University of Wisconsin School of Medicine |
|---|---|
| Graduation year | 2008 |
| Medicare specialty | Orthopedic Surgery |
Medical groups
- University of ChicagoChicago, IL · 1,712 clinicians
- The University of Chicago Medical CenterChicago, IL · 915 clinicians
Hospital affiliations
- Ingalls Memorial HospitalHarvey, IL
- The University of Chicago Medical CenterChicago, IL
Industry payments (Open Payments)
- 2025$5,506 · 7 payments from 4 companies
- 2024$1,222 · 12 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Restor3d, Inc. | $5,150 | 3 |
| Stryker Corporation | $170.31 | 2 |
| Lightbody Medical Technologies Inc | $166.68 | 1 |
| Orthopediatrics Corp. | $19.00 | 1 |
What the 2025 payments were for
- Consulting Fee$5,150 · 3 payments
- Food and Beverage$355.99 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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