Katelyn Isherwood
NPI 1639890502 · Family Medicine Physician · Derry, NH
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katelyn Isherwood is a Family Medicine Physician provider in Derry, NH (NPI 1639890502).
Provider details
- NPI number
- 1639890502
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
- License
- 265702 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
3 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Donepezil Hcl | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,531 across 66 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-09-08
- Last updated
- 2024-07-10
- Certified
- 2024-07-10
Frequently asked questions
- What is Katelyn Isherwood's NPI number?
- Katelyn Isherwood's National Provider Identifier (NPI) is 1639890502, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katelyn Isherwood's specialty?
- Katelyn Isherwood is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Katelyn Isherwood located?
- Katelyn Isherwood's practice location on file with NPPES is 44 Birch St Ste 305, Derry, NH 03038-2752.
- What is Katelyn Isherwood's phone number?
- The practice phone number listed in the NPPES registry for Katelyn Isherwood is (603) 845-1966.
- Does Katelyn Isherwood accept Medicare?
- Katelyn Isherwood is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katelyn Isherwood's NPI active?
- Yes — Katelyn Isherwood's NPI (1639890502) is active in the NPPES registry as of the last update on 2024-07-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.