Katherine A. Hollister, MD
Internal Medicine Physician · Portsmouth, NH
Katherine A. Hollister, MD is an internal medicine physician with a practice address in Portsmouth, New Hampshire, and NPI 1386083962, issued on Jun 18, 2013. Check the license (New Hampshire 12107, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Katherine A. Hollister
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 12107 NH
Self-reported in NPPES; status is on the state search - Practice location
- 100 Campus Dr, Portsmouth, NH 03801
- Phone
- (603) 422-8208
- Enumerated
- Jun 18, 2013
- Record last updated
- Jul 23, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (603) 422-8218
- Medicare enrollment
- Enrolled (PECOS I20131203000369); accepts Medicare assignment
- Medical or professional school
- Pennsylvania State University College Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 673 in New Hampshire → Look up another NPI →
Also registered at 100 Campus Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephanie Ayan, APRNFamily Nurse Practitioner1861738320
- Jill Capobianco, ARNPNurse Practitioner1013015858
- Elizabeth Harrison, APRNNurse Practitioner1174801641
- Jennifer Koop, MDFamily Medicine Physician1699769372
- Robert Millstein, MDInternal Medicine Physician1003094590
- Nathan Swanson, DDSDentist1700985439
Verify Katherine A. Hollister in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 12107Check 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 internal medicine physician in 2024
123 Medicare Part D claims for 27 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Amlodipine Besylate17 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.
Industry payments in 2024: $40.74
1 payment: food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Greater Seacoast Community HealthPortsmouth, NH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine A. Hollister among 673 internal medicine physician records in New Hampshire
Katherine A. Hollister, MD is one of 673 internal medicine physician records with a practice address in New Hampshire. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 67% of them.
- NPI issued2013 · 67% of these records are older, 30% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1996 · median 2005 among the 443 with a school on file
- Record last updated2013 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
37 internal medicine physician records list a practice address in Portsmouth
They are 37 of the 1,860 NPPES records with a practice address in Portsmouth, and 673 internal medicine physician records in New Hampshire.
All 673 in New Hampshire → Every provider in Portsmouth → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jonathan Bridges, M.D.Newington, NH 038011083744510
- Thomas Clairmont, MDPortsmouth, NH 038011053415794
- Daniel Davies, DOPortsmouth, NH 038011083683833
- Gary Fagin, M.D.Portsmouth, NH 038011376518886
- Diane Flamburis, MDPortsmouth, NH 038011851367387
- Mark Henschke, DONewington, NH 038011922092667
- Sunila Jo, MDPortsmouth, NH 038011740290097
- Paris Khavari, MDPortsmouth, NH 038011790889434
Common questions
What is Katherine A. Hollister, MD's NPI number?
Katherine A. Hollister, MD's National Provider Identifier (NPI) is 1386083962, issued on Jun 18, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Katherine A. Hollister, MD located?
The NPPES record lists a practice address at 100 Campus Dr, Portsmouth, NH, 03801. Phone: (603) 422-8208. Providers update this record themselves, so call before visiting.
How can I verify Katherine A. Hollister, MD's license?
NPPES lists New Hampshire license number 12107, 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 Katherine A. Hollister, MD prescribe under Medicare Part D?
In 2024, Katherine A. Hollister, MD had 123 Medicare Part D claims for 27 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.