Mark Loren Keldahl, MD
NPI 1114181658ActiveIndividual· Surgery, Vascular Surgery· Chicago, IL
Surgery, Vascular Surgery (MD) in Chicago, Illinois, trained at Rush Medical College of Rush University (class of 2004). In 2024 Medicare paid $96,966 for 365 patients, and Part D covered 163 of their prescriptions, 77% of them generic. Lemaitre Vascular, Inc. was the largest of 7 companies reporting payments in 2025, $137,054 in all, mostly consulting fees.
Overview
| NPI | 1114181658 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 14, 2008 |
| Last updated in NPPES | Jun 25, 2026 |
| Certified by provider | Jun 25, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery, Vascular Surgery Primary | 2086S0129X | 036-117220 | IL |
| Surgery, Vascular Surgery | 2086S0129X | 59517 | TN |
| Surgery | 208600000X | 036-117220 | IL |
| Surgery | 208600000X | 036117220 | IL |
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 - Vascular Surgery (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 365 |
|---|---|
| Services billed | 1,124 across 68 procedure codes |
| Paid by Medicare | $96,966 |
Part D prescriptions in 2024
| Prescriptions (claims) | 163 · 264 30-day fills |
|---|---|
| Patients | 75 |
| Total drug cost | $35,677 |
| Generic share | 77% of claims |
Education and affiliations
| Medical school | Rush Medical College of Rush University |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Vascular Surgery |
| Telehealth | Offers telehealth |
Medical group
- Advocate Health and Hospitals CorporationChicago, IL · 3,118 clinicians
Hospital affiliations
- Advocate Good Samaritan HospitalDowners Grove, IL
- Advocate Illinois Masonic Medical CenterChicago, IL
- Advocate Lutheran General HospitalPark Ridge, IL
- Advocate Trinity HospitalChicago, IL
Other facilities
- Advocate Home Health Care ServHome health agency · Oakbrook, IL
Industry payments (Open Payments)
- 2025$137,054 · 40 payments from 7 companies
- 2024$132,925 · 45 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lemaitre Vascular, Inc. | $132,677 | 12 |
| Angiodynamics, Inc. | $3,637 | 19 |
| Stryker Corporation | $258.39 | 4 |
| Inari Medical, Inc. | $185.28 | 1 |
| Kerecis Limited | $137.96 | 2 |
What the 2025 payments were for
- Consulting Fee$132,677 · 12 payments
- Food and Beverage$2,341 · 21 payments
- Travel and Lodging$2,036 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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