Kathleen Alfonso, FNP
Family Nurse Practitioner · Bay Shore, NY
Kathleen Alfonso, FNP is a family nurse practitioner with a practice address in Bay Shore, New York, and NPI 1225894926, issued on Feb 21, 2024. Check the license (New York F353661-01, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Kathleen Alfonso
- Credential
- FNP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- F353661-01 NY
Self-reported in NPPES; status is on the state search - Practice location
- 301 E Main St, Bay Shore, NY 11706
- Phone
- (631) 968-3000
- Enumerated
- Feb 21, 2024
- Record last updated
- Feb 21, 2024
- Medicare enrollment
- Enrolled (PECOS I20240909002012); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 14,805 in New York → Look up another NPI →
Also registered at 301 E Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kathleen Alfonso in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this profession
Search for license F353661-01Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family nurse practitioner in 2024
14 Medicare Part D claims, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through one group practice
- North Shore-Lij Medical PCBay Shore, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kathleen Alfonso among 14,805 family nurse practitioner records in New York
Kathleen Alfonso, FNP is one of 14,805 family nurse practitioner records with a practice address in New York. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2024, is newer than 83% of them.
- NPI issued2024 · 83% of these records are older, 10% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 49% of these records are
- Graduated2023 · median 2019 among the 7,239 with a school on file
- Record last updated2024 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
44 family nurse practitioner records list a practice address in Bay Shore
They are 44 of the 1,931 NPPES records with a practice address in Bay Shore, and 14,805 family nurse practitioner records in New York.
All 14,805 in New York → Every provider in Bay Shore → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Argentine BelfortBay Shore, NY 117061407366818
- Christy DefournoyBay Shore, NY 117061134408602
- Yeon Elebiary, FNPBay Shore, NY 117061487064424
- Christine Fanelli, NPBay Shore, NY 117061689632622
- Andrea Flannery, FNPBay Shore, NY 117061679586481
- Debra Hartnett, NPBay Shore, NY 117061497975957
- Jasmine Helvetius-PhilippeBay Shore, NY 117061457692469
- Carly Jean-Lys, FNPBay Shore, NY 117061326538026
Common questions
What is Kathleen Alfonso, FNP's NPI number?
Kathleen Alfonso, FNP's National Provider Identifier (NPI) is 1225894926, issued on Feb 21, 2024. An NPI identifies a provider in billing; it is not a license.
Where is Kathleen Alfonso, FNP located?
The NPPES record lists a practice address at 301 E Main St, Bay Shore, NY, 11706. Phone: (631) 968-3000. Providers update this record themselves, so call before visiting.
How can I verify Kathleen Alfonso, FNP's license?
NPPES lists New York license number F353661-01, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Kathleen Alfonso, FNP prescribe under Medicare Part D?
In 2024, Kathleen Alfonso, FNP had 14 Medicare Part D claims; the average among family nurse practitioner prescribers was 1,305. 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.