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

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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

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