Alexandra Karl, FNP-C
Family Nurse Practitioner · Massapequa, NY
Alexandra Karl, FNP-C is a family nurse practitioner with a practice address in Massapequa, New York, and NPI 1639658206, issued on Aug 14, 2018. Check the license (New York 343462, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Alexandra Karl
- Credential
- FNP-C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 343462 NY
Self-reported in NPPES; status is on the state search - Practice location
- 4200 Sunrise Hwy, Massapequa, NY 11758
- Phone
- (516) 809-9666
- Enumerated
- Aug 14, 2018
- Record last updated
- Feb 5, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 14,805 in New York → Look up another NPI →
Also registered at 4200 Sunrise Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Paul Bernstein, DPMSports Medicine Podiatrist1932102688
- Victoria Franco, DOChiropractor1043089972
- Jeffrey Hart, DOOrthopaedic Surgery Physician1386801579
- Alice Higgins, P.T.A.Physical Therapy Assistant1679652374
- Thomas Jan, D.O.Pain Medicine (Physical Medicine & Rehabilitation) Physician1871685404
- Ann Marie Pelayre, PTPhysical Therapist1437126711
Verify Alexandra Karl 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 343462Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average family nurse practitioner in 2024
184 Medicare Part D claims for 92 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone89 claims
- Hydroxychloroquine Sulfate21 claims
- Gabapentin17 claims
- Allopurinol11 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: $1,621.51
50 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 99,489 providers of this specialty with any payment received $650.95 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.
Alexandra Karl among 14,805 family nurse practitioner records in New York
Alexandra Karl, FNP-C 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 2018, is newer than 47% of them.
- NPI issued2018 · 47% of these records are older, 48% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileNo · 49% of these records are
- Record last updated2019 · 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).
20 family nurse practitioner records list a practice address in Massapequa
They are 20 of the 1,195 NPPES records with a practice address in Massapequa, and 14,805 family nurse practitioner records in New York.
All 14,805 in New York → Every provider in Massapequa → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Chantale BeauvaisMassapequa, NY 117581447575956
- Antoinette Exantus, NPMassapequa, NY 117581427213974
- Alexandra GrossMassapequa, NY 117581477094399
- Jennifer KumarMassapequa, NY 117581457137747
- Christine Lapersonerie, FNP-CMassapequa, NY 117581245838416
- Marie Louis-Charles, FNPMassapequa, NY 117581962716134
- Ashley Mancilla, FNP-BCMassapequa, NY 117581134736937
- Lindsay MaurinMassapequa, NY 117581538624911
Common questions
What is Alexandra Karl, FNP-C's NPI number?
Alexandra Karl, FNP-C's National Provider Identifier (NPI) is 1639658206, issued on Aug 14, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Alexandra Karl, FNP-C located?
The NPPES record lists a practice address at 4200 Sunrise Hwy, Massapequa, NY, 11758. Phone: (516) 809-9666. Providers update this record themselves, so call before visiting.
How can I verify Alexandra Karl, FNP-C's license?
NPPES lists New York license number 343462, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Alexandra Karl, FNP-C prescribe under Medicare Part D?
In 2024, Alexandra Karl, FNP-C had 184 Medicare Part D claims for 92 beneficiaries; 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.