Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mrs. Karen Olivia Callahan, ARNP

Individual provider Nurse Practitioner · NPI 1538671672

Mrs. Karen Olivia Callahan, ARNP is a Nurse Practitioner in Lady Lake, Florida. Qualified in 2017, 9 years ago. Practices with Legacy Healthcare Services Inc, a 3,624-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Florida.

Years since qualifying
9
Licensed in
FL
In the registry since
2017
What do these letters mean?
ARNP — Advanced Registered Nurse Practitioner
The title some states use for an advanced practice nurse.

See every abbreviation used in this directory →

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Practice location Address checks out

607 Highway 466
Lady Lake, FL 32159-6338
Phone: (352) 259-7994
Fax: (352) 259-7994
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 3536 Picciola Cutoff Rd, Fruitland Park, FL 34731-6309 — (352) 536-3660

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence 9249882 (FL)

Record details

NPI number1538671672
Entity typeIndividual (Type 1)
GenderFemale
Credentials ARNP
Sole proprietorYes
NPI enumeratedOctober 30, 2017
Last updated in NPPESMarch 17, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Legacy Healthcare Services Inc — 3624 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients551
Services billed 1,989 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $275 13 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Florida Homecare Specialists Inc Home health agency · Lady Lake, FL · listed as Florida Homecare Specialists Incorporated
  • Villages Regional Hospital, The Hospital · The Villages, FL
  • Concierge Home Care Home health agency · The Villages, FL

Colleagues at Legacy Healthcare Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3624 clinicians in the practice; 12 are shown here.

Other providers in Lady Lake