Oliver P. Herfort, MD
Internal Medicine Physician · Claremont, NH
Oliver P. Herfort, MD is an internal medicine physician with a practice address in Claremont, New Hampshire, and NPI 1497774848, issued on Jul 18, 2006. Check the license (New Hampshire 11828, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Oliver P. Herfort
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 11828 NH
Self-reported in NPPES; status is on the state search - Practice location
- 241 Elm Street, Claremont, NH 03743
- Phone
- (603) 543-6900
- Enumerated
- Jul 18, 2006
- Record last updated
- Feb 22, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (603) 542-9497
- Medicaid IDs
- 70001000 NH
1009816 VT - Medicare enrollment
- Enrolled (PECOS I20060309000071); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 241 Elm Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nancy Arnold, NPFamily Nurse Practitioner1750487112
- Katherine Cooper, NP-CNurse Practitioner1861868531
- Theresa McCafferty, LCMHCMental Health Counselor1245535194
- James Wilton, DPMFoot & Ankle Surgery Podiatrist1942490776
Verify Oliver P. Herfort in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 11828Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% more Medicare Part D claims than the average internal medicine physician in 2024
4,953 Medicare Part D claims for 514 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 126 claims were for opioids.
Most prescribed
- Atorvastatin Calcium362 claims
- Lisinopril331 claims
- Losartan Potassium197 claims
- Amlodipine Besylate183 claims
- Omeprazole145 claims
- Levothyroxine Sodium142 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.
One hospital affiliation
- Mary Hitchcock Memorial HospitalLebanon, NH · Acute Care Hospitals3 of 5 stars
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.
Internal Medicine Physician providers in New Hampshire
There are 673 internal medicine physician records in New Hampshire.
Other internal medicine physician records in New Hampshire
- Lauren Abbott, MDPortsmouth, NH1619597234
- Moaz AbdelrehimManchester, NH1962064790
- Champa Abeysinghe, M.D.New London, NH1629257134
- Munder Abuaisha, MDManchester, NH1265926406
- Indira AcharyaLebanon, NH1407428600
- Lisa Adams, MDLebanon, NH1912225186
- Ogechi Agogbuo, MDNew London, NH1265007595
- Anardi Agosto, M.D.Keene, NH1487090700
- Asma Ahmed, MDNashua, NH1972788073
- Annie Airey, DOLaconia, NH1487395141
Common questions
What is Oliver P. Herfort, MD's NPI number?
Oliver P. Herfort, MD's National Provider Identifier (NPI) is 1497774848, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Oliver P. Herfort, MD located?
The NPPES record lists a practice address at 241 Elm Street, Claremont, NH, 03743. Phone: (603) 543-6900. Providers update this record themselves, so call before visiting.
How can I verify Oliver P. Herfort, MD's license?
NPPES lists New Hampshire license number 11828, as entered by the provider. 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 Oliver P. Herfort, MD prescribe under Medicare Part D?
In 2024, Oliver P. Herfort, MD had 4,953 Medicare Part D claims for 514 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.