Ivar Frithsen, MD
NPI 1891803755 · Family Medicine Physician · Keene, NH
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ivar Frithsen, MD is a Family Medicine Physician provider in Keene, NH (NPI 1891803755).
Provider details
- NPI number
- 1891803755
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 25940 (SC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
117 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 74 | $75 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 27 | $109 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 16 | $47 |
Typical Medicare-allowed amounts for these services range $47–$109 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-29
- Last updated
- 2012-04-18
Frequently asked questions
- What is Ivar Frithsen's NPI number?
- Ivar Frithsen's National Provider Identifier (NPI) is 1891803755, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ivar Frithsen's specialty?
- Ivar Frithsen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ivar Frithsen located?
- Ivar Frithsen's practice location on file with NPPES is 580 Court St, Keene, NH 03431-1718.
- What is Ivar Frithsen's phone number?
- The practice phone number listed in the NPPES registry for Ivar Frithsen is (603) 354-5454.
- Does Ivar Frithsen accept Medicare?
- Ivar Frithsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ivar Frithsen's NPI active?
- Yes — Ivar Frithsen's NPI (1891803755) is active in the NPPES registry as of the last update on 2012-04-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.