Nicholas Knoble Callahan, DO
NPI 1659783934ActiveIndividual· Orthopaedic Surgery· Mayfield Heights, OH
Orthopaedic Surgery (DO) in Mayfield Heights, Ohio, trained at Lake Erie College of Osteopathic Medicine, Erie (class of 2014). 251 Medicare patients in 2024, $123,435 paid; all of their 295 Part D prescriptions were generic. Zimmer Biomet Holdings, Inc. was the largest of 3 companies reporting payments in 2025, $2,949 in all, mostly travel and lodging.
Overview
| NPI | 1659783934 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | May 21, 2014 |
| Last updated in NPPES | Jul 28, 2026 |
| Certified by provider | Jul 28, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery Primary | 207X00000X | 34.014321 | OH |
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 (OH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 251 |
|---|---|
| Services billed | 1,860 across 78 procedure codes |
| Paid by Medicare | $123,435 |
Part D prescriptions in 2024
| Prescriptions (claims) | 295 · 297 30-day fills |
|---|---|
| Patients | 90 |
| Total drug cost | $2,173 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | Lake Erie College of Osteopathic Medicine, Erie |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Orthopedic Surgery |
Medical groups
- Novacare Rehabilitation of Ohio IncNiles, OH · 80 clinicians
- Cleveland Orthopedic and Spine Institute, LLCBeachwood, OH · 17 clinicians
Hospital affiliations
- Cleveland ClinicCleveland, OH
- Crystal Clinic Orthopaedic CenterAkron, OH
- Lake Health Beachwood Medical CenterBeachwood, OH
- Southwest General Health CenterMiddleburg Heights, OH
- Uh Cleveland Medical CenterCleveland, OH
Other facilities
- Patriot Homecare, IncHome health agency · Girard, OH
Industry payments (Open Payments)
- 2025$2,949 · 20 payments from 3 companies
- 2024$193.69 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Zimmer Biomet Holdings, Inc. | $1,748 | 13 |
| Medacta USA, Inc. | $835.53 | 3 |
| Stryker Corporation | $365.25 | 4 |
What the 2025 payments were for
- Travel and Lodging$1,601 · 8 payments
- Food and Beverage$1,348 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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