Zachary Mark Working, MD
NPI 1790051084ActiveIndividual· Orthopaedic Surgery, Orthopaedic Trauma· Portland, OR
Orthopaedic Surgery, Orthopaedic Trauma (MD) in Portland, Oregon, trained at University of Pittsburgh School of Medicine (class of 2012). Mostly services rather than prescriptions: Medicare paid $59,012 for 84 patients in 2024, with only 17 Part D claims. Synthes Gmbh was the largest of 3 companies reporting payments in 2025, $6,464 in all, mostly travel and lodging.
Overview
| NPI | 1790051084 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Mar 30, 2012 |
| Last updated in NPPES | Aug 21, 2024 |
| Certified by provider | Aug 21, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery, Orthopaedic Trauma Primary | 207XX0801X | MD188610 | OR |
| Orthopaedic Surgery | 207X00000X | A148264 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Orthopedic Surgery (OR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 84 |
|---|---|
| Services billed | 208 across 64 procedure codes |
| Paid by Medicare | $59,012 |
Part D prescriptions in 2024
| Prescriptions (claims) | 17 · 17 30-day fills |
|---|---|
| Total drug cost | $182.99 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | University of Pittsburgh School of Medicine |
|---|---|
| Graduation year | 2012 |
| Medicare specialty | Orthopedic Surgery |
Medical group
- University Professional ServicesBeaverton, OR · 1,724 clinicians
Hospital affiliation
- Ohsu Hospital and ClinicsPortland, OR
Industry payments (Open Payments)
- 2025$6,464 · 37 payments from 3 companies
- 2024$1,488 · 7 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Synthes Gmbh | $5,997 | 9 |
| Stryker Corporation | $249.44 | 23 |
| Depuy Synthes Sales Inc. | $217.89 | 5 |
What the 2025 payments were for
- Travel and Lodging$2,706 · 5 payments
- Consulting Fee$1,500 · 1 payment
- Compensation for serving as faculty or as a speaker for a medical education program$1,500 · 1 payment
- Food and Beverage$758.47 · 30 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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