Katelyn Isherwood
Family Medicine Physician · Derry, NH
Katelyn Isherwood is a family medicine physician with a practice address in Derry, New Hampshire, and NPI 1639890502, issued on Sep 8, 2022. Check the license on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Katelyn Isherwood
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 265702 MA
Self-reported in NPPES; status is on the state search - Practice location
- 44 Birch St Ste 305, Derry, NH 03038
- Phone
- (603) 845-1966
- Enumerated
- Sep 8, 2022
- Record last updated
- Jul 10, 2024
- Medicare enrollment
- Enrolled (PECOS I20250623002927); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 816 in New Hampshire → Look up another NPI →
Verify Katelyn Isherwood 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
98% fewer Medicare Part D claims than the average family medicine physician in 2024
87 Medicare Part D claims for 33 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Donepezil Hcl11 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: $1,530.56
66 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 55,478 providers of this specialty with any payment received $902.55 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.
Katelyn Isherwood among 816 family medicine physician records in New Hampshire
Katelyn Isherwood 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 2022, is newer than 96% of them.
- NPI issued2022 · 96% of these records are older, 2% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2021 · median 2003 among the 498 with a school on file
- Record last updated2024 · 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).
23 family medicine physician records list a practice address in Derry
They are 23 of the 597 NPPES records with a practice address in Derry, and 816 family medicine physician records in New Hampshire.
All 816 in New Hampshire → Every provider in Derry → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Theodore Brooks, MDDerry, NH 030381023088812
- John Daley, M.D.Derry, NH 030381720058944
- Douglas Dreffer, M.D.Derry, NH 030381316940802
- Cristi Egenolf, M.D.Derry, NH 030381053391565
- David Freedman, MDDerry, NH 030381356418305
- Jonathan Kilroy, DODerry, NH 030381578534806
- Alexander Kovanko, DODerry, NH 030381588673909
- Scott Low, DODerry, NH 030381689614091
Common questions
What is Katelyn Isherwood's NPI number?
Katelyn Isherwood's National Provider Identifier (NPI) is 1639890502, issued on Sep 8, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Katelyn Isherwood located?
The NPPES record lists a practice address at 44 Birch St Ste 305, Derry, NH, 03038. Phone: (603) 845-1966. Providers update this record themselves, so call before visiting.
How can I verify Katelyn Isherwood'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 Katelyn Isherwood prescribe under Medicare Part D?
In 2024, Katelyn Isherwood had 87 Medicare Part D claims for 33 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.