Mark Laverne Janzen, MD
NPI 1932329265ActiveIndividual· Surgery, Vascular Surgery· Riverside, CA
Surgery, Vascular Surgery (MD) with Enloe Medical Center, practicing in Riverside, California. 520 Medicare patients in 2024, $194,344 paid; nearly all of their 225 Part D prescriptions were generic (93%). Stryker Corporation was the largest of 6 companies reporting payments in 2025, $707.84 in all, mostly food and beverage. Lists Adventist Health and Rideout and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1932329265 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Apr 27, 2007 |
| Last updated in NPPES | Jan 27, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery, Vascular Surgery Primary | 2086S0129X | A90203 | CA |
| Surgery | 208600000X | 089484 | OH |
| Surgery, Trauma Surgery | 2086S0127X | 089484 | 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 - Vascular Surgery (CA); Practitioner - Vascular Surgery (OR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 520 |
|---|---|
| Services billed | 1,520 across 124 procedure codes |
| Paid by Medicare | $194,344 |
Part D prescriptions in 2024
| Prescriptions (claims) | 225 · 295 30-day fills |
|---|---|
| Patients | 115 |
| Total drug cost | $12,645 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Vascular Surgery |
| Telehealth | Offers telehealth |
Medical group
- Enloe Medical CenterChico, CA · 333 clinicians
Hospital affiliations
- Adventist Health and RideoutMarysville, CA
- Adventist Health ClearlakeClearlake, CA
- Enloe HealthChico, CA
- Oroville HospitalOroville, CA
- St Elizabeth Community HospitalRed Bluff, CA
Other facilities
- Butte Home Health and HospiceHome health agency · Chico, CA
Industry payments (Open Payments)
- 2025$707.84 · 15 payments from 6 companies
- 2024$9,951 · 20 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Stryker Corporation | $242.45 | 8 |
| Boston Scientific Corporation | $140.34 | 1 |
| W. L. Gore & Associates, Inc. | $110.92 | 1 |
| Cook Medical LLC | $106.77 | 1 |
| Shockwave Medical, Inc | $72.34 | 2 |
What the 2025 payments were for
- Food and Beverage$707.84 · 15 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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