IVAR LESLIE FRITHSEN MD
NPI 1891803755
Family Medicine in Keene, NH
About Ivar Leslie Frithsen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
IVAR LESLIE FRITHSEN MD (NPI 1891803755) is an individual family medicine provider in Keene, New Hampshire, licensed in South Carolina (25940) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Mary Hitchcock Memorial Hospital, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 3
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Ivar Leslie Frithsen Md 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.
Areas of Expertise CMS Part B claims 3
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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mary Hitchcock Memorial Hospital
Acute Care Hospitals · Lebanon, NHLittleton Regional Healthcare
Critical Access Hospitals · Littleton, NHBrattleboro Memorial Hospital
Acute Care Hospitals · Brattleboro, VTNortheastern Vermont Regional Hospital
Critical Access Hospitals · Saint Johnsbury, VTPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 03431 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
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 Ivar Frithsen's NPI number?
The NPI number for Ivar Frithsen is 1891803755. It was assigned to this individual provider in the NPPES registry on August 29, 2006.
Where is Ivar Frithsen located?
Ivar Frithsen practices at 580 Court St, Keene, NH 03431. The listed phone number is (603) 354-5454.
What is Ivar Frithsen's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Ivar Frithsen enrolled in Medicare?
Yes. Ivar Frithsen 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.
What insurance does Ivar Frithsen accept?
Health plans from Anthem Blue Cross and Blue Shield list Ivar Frithsen 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.
Is Ivar Frithsen affiliated with any hospitals?
According to CMS data, Ivar Frithsen is affiliated with Mary Hitchcock Memorial Hospital, Littleton Regional Healthcare, Brattleboro Memorial Hospital and Northeastern Vermont Regional Hospital.
When was this NPI record last updated?
The NPPES record for Ivar Frithsen was last updated on September 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 days 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.
# Ivar Leslie Frithsen, MD · NPI 1891803755
Family Medicine physician in Keene, New Hampshire. Individual provider, active in the CMS NPPES registry since August 29, 2006.
## Identity
- **NPI:** 1891803755 (Entity type: Individual)
- **Enumerated:** August 29, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 25940 (South Carolina)
- **Sole proprietor:** No
## Practice location
- **Address:** 580 COURT ST, Keene, NH 03431-1718
- **Phone:** (603) 354-5454
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Medical school:** Other, class of 2002
## Record status
- **NPPES last updated:** September 30, 2026
- **Other identifiers:** Medicaid 32001211 (NH); Medicaid 3075101 (NH); Medicaid 259400 (SC)
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Source: [NPI Profile](https://npiprofile.com/npi/1891803755) · Data from the CMS NPPES public registry.