JAMES L LEENSTRA M.D.
NPI 1174593982
Radiology - Radiation Oncology in Rochester, MN
About James L Leenstra M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JAMES L LEENSTRA M.D. (NPI 1174593982) is an individual radiation oncology provider in Rochester, Minnesota, licensed in Minnesota (45776) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS, is affiliated with Mayo Clinic Hospital Rochester, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
James L Leenstra M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show James Leenstra reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Rochester, MN 55905
- Reassigned Medicare billing, Minnesota and Wisconsin enrollments
- Also billed through NPI 1922074434 (Wisconsin)
- 6,534 clinicians in this Medicare group
Red Wing, MN 55066
- Reassigned Medicare billing, Minnesota enrollment
- 1,571 clinicians in this Medicare group
La Crosse, WI 54601
- Reassigned Medicare billing, Wisconsin enrollment
- 1,003 clinicians in this Medicare group
Menomonie, WI 54751
- Reassigned Medicare billing, Wisconsin enrollment
- 1,248 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 12
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mayo Clinic Hospital Rochester
Acute Care Hospitals · Rochester, MNNorthfield Hospital
Acute Care Hospitals · Northfield, MNMayo Clinic Health System In Red Wing
Acute Care Hospitals · Red Wing, MNMayo Clinic Health System - Cannon Falls
Critical Access Hospitals · Cannon Falls, MNMayo Clinic Health System New Prague
Critical Access Hospitals · New Prague, MNPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 55905 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ROCHESTER, MN 55905
ROCHESTER, MN 55905
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is James Leenstra's NPI number?
The NPI number for James Leenstra is 1174593982. It was assigned to this individual provider in the NPPES registry on January 24, 2006.
Where is James Leenstra located?
James Leenstra practices at 200 1st St SW, Rochester, MN 55905. The listed phone number is (507) 284-2511.
What is James Leenstra's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is James Leenstra enrolled in Medicare?
Yes. James Leenstra is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for James Leenstra's services?
According to the CMS Revalidation Reassignment List (October 2026 release), James Leenstra reassigns Medicare benefits to 4 organizations: Mayo Clinic (Rochester, MN), Mayo Clinic Health System-Southeast Minnesota Region (Red Wing, MN), Mayo Clinic Health System-Southwest Wisconsin Region, Inc. (La Crosse, WI) and Mayo Clinic Health System-Northwest Wisconsin Region, Inc. (Menomonie, WI). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for James Leenstra's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is James Leenstra affiliated with any hospitals?
According to CMS data, James Leenstra is affiliated with Mayo Clinic Hospital Rochester, Northfield Hospital, Mayo Clinic Health System In Red Wing, Mayo Clinic Health System - Cannon Falls and Mayo Clinic Health System New Prague.
When was this NPI record last updated?
The NPPES record for James Leenstra was last updated on March 29, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.