Quick answers
- Does Michael J. Lillestol accept Medicare assignment?
- Yes. Medicare's clinician data says Michael J. Lillestol accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Michael J. Lillestol see?
- In 2024, CMS data shows 559 Original Medicare patients and 3,044 services for Michael J. Lillestol. This counts Original Medicare only and measures volume, not quality.
- What is Michael J. Lillestol's NPI number?
- 1669427688. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Michael J. Lillestol, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 559 |
|---|---|
| Services billed to Medicare | 3,044 |
| Different services or procedures | 89 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)548 services
- Insertion of needle into vein for collection of blood sample (36415)458 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)300 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)192 services
- Dxa bone density measurement of hip, pelvis, spine (77080)181 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure72%
- Arthritis51%
- Chronic kidney disease29%
- Osteoporosis26%
- Anxiety25%
Hospitals where Michael J. Lillestol works
Medicare's Facility Affiliation Data lists Michael J. Lillestol at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Essentia HealthFargo, ND · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 350070
- Essentia Health St Marys - Detroit LakesDetroit Lakes, MN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 240101
- Sanford Medical Center FargoFargo, ND · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 350011
Practice locations
Addresses where Michael J. Lillestol is enrolled with Medicare (CMS data updated October 2, 2026).
- 4450 31st Ave S, Suite 102Fargo, ND 58104 (701) 280‑2033
Group practices
Medicare enrollment lists Michael J. Lillestol as a member of this group (CMS data updated October 2, 2026).
- Internal Medicine Associates Inc13 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Fargo
Clinicians with the same Medicare primary specialty in Fargo, ND — not a recommendation.
Other clinicians in Internal Medicine Associates Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of North Dakota School Of Medicine |
| Graduation year | 1974 (52 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669427688 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians