James Allan Karlson, MD
NPI 1114915261ActiveIndividual· Orthopaedic Surgery, Sports Medicine· Cambridge, MA
Orthopaedic Surgery, Sports Medicine (MD) in Cambridge, Massachusetts, trained at Warren Alpert Medical School of Brown University (class of 1988). 477 Medicare patients in 2024, $141,091 paid; nearly all of their 142 Part D prescriptions were generic (93%). Vertex Pharmaceuticals Incorporated was the largest of 4 companies reporting payments in 2025, $145.37 in all, mostly food and beverage.
Overview
| NPI | 1114915261 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 12, 2005 |
| Last updated in NPPES | Aug 7, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery, Sports Medicine Primary | 207XX0005X | 74009 | MA |
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 (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 477 |
|---|---|
| Services billed | 5,245 across 36 procedure codes |
| Paid by Medicare | $141,091 |
Part D prescriptions in 2024
| Prescriptions (claims) | 142 · 143 30-day fills |
|---|---|
| Patients | 96 |
| Total drug cost | $3,271 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | Warren Alpert Medical School of Brown University |
|---|---|
| Graduation year | 1988 |
| Medicare specialty | Orthopedic Surgery |
Medical groups
- President and Fellows of Harvard CollegeCambridge, MA · 97 clinicians
- Boston Orthopaedic and Spine LLCBrighton, MA · 19 clinicians
Hospital affiliation
- Mount Auburn HospitalCambridge, MA
Other facilities
- Spaulding Rehabilitation HospitalInpatient rehabilitation facility · Charlestown, MA
Industry payments (Open Payments)
- 2025$145.37 · 5 payments from 4 companies
- 2024$29.37 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vertex Pharmaceuticals Incorporated | $65.05 | 2 |
| Convatec Inc. | $32.70 | 1 |
| Dynasplint Systems Inc. | $26.11 | 1 |
| Pacira Pharmaceuticals Incorporated | $21.51 | 1 |
What the 2025 payments were for
- Food and Beverage$145.37 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Orthopaedic Surgery, Sports Medicine providers in Cambridge
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