Ivar Leslie Frithsen, MD
Family Medicine Physician · Keene, NH
Ivar Leslie Frithsen, MD is a family medicine physician with a practice address in Keene, New Hampshire, and NPI 1891803755, issued on Aug 29, 2006. Check the license on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Ivar Leslie Frithsen
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 25940 SC
Self-reported in NPPES; status is on the state search - Practice location
- 580 Court St, Keene, NH 03431
- Phone
- (603) 354-5454
- Enumerated
- Aug 29, 2006
- Record last updated
- Apr 18, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicaid IDs
- 259400 SC
32001211 NH - Medicare enrollment
- Enrolled (PECOS I20240930002320); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 816 in New Hampshire → Look up another NPI →
Also registered at 580 Court St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kelli-Ann Abbott, DPTPhysical Therapist1699155754
- Kristina Abbott, FNP-CFamily Nurse Practitioner1578368916
- Millen Abselab, MDStudent in an Organized Health Care Education/Training Program1740128479
- Anardi Agosto, M.D.Internal Medicine Physician1487090700
- Yousef Amr, MB BCHStudent in an Organized Health Care Education/Training Program1598515652
- Amy Ansaldo, RD, LDRegistered Dietitian1215796131
Verify Ivar Leslie Frithsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family medicine physician in 2024
131 Medicare Part D claims for 72 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 73.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
3 hospitals and group practices
- Brattleboro Memorial HospitalBrattleboro, VT · Acute Care Hospitals3 of 5 stars
- Littleton Hospital AssociationLittleton, NH
- Northeastern Vermont Regional Hospital IncSaint Johnsbury, VT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Ivar Leslie Frithsen among 816 family medicine physician records in New Hampshire
Ivar Leslie Frithsen, MD is one of 816 family medicine physician records with a practice address in New Hampshire. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 43% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2002 · median 2003 among the 498 with a school on file
- Record last updated2012 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
43 family medicine physician records list a practice address in Keene
They are 43 of the 1,482 NPPES records with a practice address in Keene, and 816 family medicine physician records in New Hampshire.
All 816 in New Hampshire → Every provider in Keene → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Judith Boule, M.D.Keene, NH 034311912939240
- Joseph Capobianco, MDKeene, NH 034311710976105
- Don Caruso, MDKeene, NH 034311477571545
- Erika Goldstein, ARNPKeene, NH 034311659338838
- Marika Henegan, MDKeene, NH 034311477558385
- Steven Hertford, MDKeene, NH 034311225050776
- Douglas Keene, M.D.Keene, NH 034311407874415
- Gerard Kiernan, MDKeene, NH 034311295752038
Common questions
What is Ivar Leslie Frithsen, MD's NPI number?
Ivar Leslie Frithsen, MD's National Provider Identifier (NPI) is 1891803755, issued on Aug 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ivar Leslie Frithsen, MD located?
The NPPES record lists a practice address at 580 Court St, Keene, NH, 03431. Phone: (603) 354-5454. Providers update this record themselves, so call before visiting.
How can I verify Ivar Leslie Frithsen, MD's license?
Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ivar Leslie Frithsen, MD prescribe under Medicare Part D?
In 2024, Ivar Leslie Frithsen, MD had 131 Medicare Part D claims for 72 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Ivar Leslie Frithsen, MD's MIPS final score?
The 2023 MIPS final score is 73.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.