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INTERNAL MEDICINE ASSOCIATES INC
NPI 1144313743
Internal Medicine in Fargo, ND

Active since October 02, 2006CLIA 35D0408393 · Accreditation
4450 31ST AVE S STE 102, FARGO, ND 58104(701) 280-2033(701) 232-5578 Get Directions Write a Review

NPPES record last updated: April 18, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Internal Medicine Associates Inc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

INTERNAL MEDICINE ASSOCIATES INC (NPI 1144313743) is a healthcare organization registered as an internal medicine in Fargo, North Dakota and active in the NPI registry since October 2006. The organization holds an CLIA Accreditation certificate valid through August 20, 2028 and lists Michael J Lillestol, President, as its authorized official.

NPPES Registry Identity

NPI1144313743
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameINTERNAL MEDICINE ASSOCIATES INC
Location Address4450 31ST AVE S STE 102Fargo, ND 58104-4557
Mailing Address4450 31st Ave S Ste 102Fargo, ND 58104-4557 · (701) 280-2033 · Fax (701) 232-5578
Phone(701) 280-2033
Fax(701) 232-5578
Organization SubpartNo
Authorized OfficialMichael J LillestolPresident · (701) 280-2033
Enumeration DateOctober 2, 2006
Last NPPES UpdateApril 18, 2025
NPPES CertifiedApril 18, 2025
✔ NPI 1144313743 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
4450 31ST AVE S STE 102, Fargo, ND 58104
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Other Identifiers 4

Other162D7INMN · Mn Blue Shield
Medicaid301713300MN
Medicaid11941ND
Other05595001ND · Nd Blue Shield

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross Blue Shield of North Dakota, Sanford Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Internal Medicine Associates Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

15

Medicare enrollment records show 15 clinicians reassign Medicare billing to Internal Medicine Associates Inc, which bills Medicare for the services they deliver. Of these, 5 practice at this address and 14 within 10 miles. They are listed nearest first.

Clinicians by Medicare Specialty 6

Internal Medicine6
Nurse Practitioner5
Dermatology1
General Surgery1
Obstetrics/Gynecology1
Pediatric Medicine1

Clinicians, nearest first (15)

Steven Clemenson, MD
Internal Medicine
NPI 1174541874
4450 31ST AVE S STE 102
Fargo, ND 58104
(701) 280-2033
✔ PECOSSame address
Brent Hella, M.D.
Internal Medicine
NPI 1245286988
4450 31ST AVE S STE 102
Fargo, ND 58104
(701) 280-2033
✔ PECOS✔ Accepts MedicareSame address
Jenifer Jones, MD
Pediatric Medicine
NPI 1588698088
4450 31ST AVE S STE 102
Fargo, ND 58104
(701) 280-2033
✔ PECOS✔ Accepts MedicareSame address
Michael Blankinship
Dermatology
NPI 1780826867
4450 31ST AVE S STE 102
Fargo, ND 58104
(701) 280-2033
✔ PECOS✔ Accepts MedicareSame address
Denise Schumacher, MD
Obstetrics/Gynecology
NPI 1124049341
4450 31ST AVE S STE 102
Fargo, ND 58104
(012) 802-0337
✔ PECOS✔ Accepts MedicareSame address
Pamela Holtz, FNP-C
Nurse Practitioner
NPI 1982973251
3000 32ND AVE S
Fargo, ND 58103
(701) 364-8000
✔ PECOS1.6 mi
Mykell Barnacle, NP
Nurse Practitioner
NPI 1790921252
1707 GOLD DR S STE 101
Fargo, ND 58103
(701) 280-3191
✔ PECOS✔ Accepts Medicare2.3 mi
Karissa Emerson, NP
Nurse Practitioner
NPI 1912490830
1707 GOLD DR S STE 101
Fargo, ND 58103
(701) 280-2033
✔ PECOS✔ Accepts Medicare2.3 mi
Michael Lillestol, M.D.
Internal Medicine
NPI 1669427688
1707 GOLD DR STE 101
Fargo, ND 58103
(701) 280-2033
✔ PECOS✔ Accepts Medicare2.3 mi
Timothy Mahoney, MD
General Surgery
NPI 1689608192
1707 GOLD DR S STE 101
Fargo, ND 58103
(701) 280-2033
✔ PECOS✔ Accepts Medicare2.3 mi
Bhanu Odedra Mistry, MD
Internal Medicine
NPI 1194742668
1707 GOLD DR S STE 101
Fargo, ND 58103
(701) 280-2033
✔ PECOS✔ Accepts Medicare2.3 mi
Mark Yohe, M.D.
Internal Medicine
NPI 1346403995
1707 GOLD DR S STE 101
Fargo, ND 58103
(701) 280-2033
✔ PECOS✔ Accepts Medicare2.3 mi
Jessica Kuhn, DNP
Nurse Practitioner
NPI 1245591502
1702 UNIVERSITY DR S
Fargo, ND 58103
(701) 364-3300
✔ PECOS✔ Accepts Medicare3.3 mi
Ronovan Ottenbacher, M.D.
Internal Medicine
NPI 1548516032
2101 ELM ST N
Fargo, ND 58102
(701) 239-3700
✔ PECOS6.5 mi
Tracy Fiser, APRN
Nurse Practitioner
NPI 1154711943
2213 BRECKENRIDGE TER
Greenwood, AR 72936
(479) 252-1031
✔ PECOS✔ Accepts Medicare812 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Accreditation 35D0408393

Internal Medicine Associates · Fargo, ND
Active · expires Aug 20, 2028
CLIA Number35D0408393
Laboratory TypePhysician Office
Certificate Effective DateAugust 21, 2026
Certificate Expiration DateAugust 20, 2028
Laboratory DirectorAdeline Teske
Laboratory Phone(701) 235-7416
Laboratory LocationInternal Medicine Associates4450 31st Ave S Suite 102, Fargo, ND 58104
CLIA data matches this NPI record on: Address Name
This is a certificate that is issued to a laboratory on the basis of the laboratory's accreditation by an accreditation organization approved by CMS.

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 Internal Medicine Associates Inc's NPI number?

The NPI number for Internal Medicine Associates Inc is 1144313743. It was assigned to this organization in the NPPES registry on October 2, 2006.

Where is Internal Medicine Associates Inc located?

Internal Medicine Associates Inc is located at 4450 31st Ave S Ste 102, Fargo, ND 58104. The listed phone number is (701) 280-2033.

What is Internal Medicine Associates Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Internal Medicine Associates Inc enrolled in Medicare?

Yes. Internal Medicine Associates Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Internal Medicine Associates Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 15 clinicians in 6 Medicare specialties reassign their Medicare billing to Internal Medicine Associates Inc. A 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 the clinician's services. The largest specialties are Internal Medicine (6), Nurse Practitioner (5) and Dermatology (1). Of these, 5 practice at this address and 14 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Internal Medicine Associates Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Accreditation (number 35D0408393) is associated with this NPI, valid through August 20, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

What insurance does Internal Medicine Associates Inc accept?

Health plans from Blue Cross Blue Shield of North Dakota and Sanford Health Plan list Internal Medicine Associates Inc as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Internal Medicine Associates Inc was last updated on April 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months 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.