Karen Callahan, ARNP
NPI 1538671672 · Nurse Practitioner · Lady Lake, FL
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Callahan, ARNP is a Nurse Practitioner provider in Lady Lake, FL (NPI 1538671672).
Provider details
- NPI number
- 1538671672
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- ARNP
- Sex
- Female
- Sole proprietor
- Yes
- License
- 9249882 (FL)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,805 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 774 | $112 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 748 | $79 |
| Urinalysis, Manual Test81002 | 86 | $3 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 45 | $12 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 42 | $12 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 107 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 438 | 135 |
| Atorvastatin Calcium | 429 | 137 |
| Lisinopril | 341 | 108 |
| Rosuvastatin Calcium | 261 | 90 |
| Losartan Potassium | 230 | 78 |
| Omeprazole | 212 | 65 |
| Amlodipine Besylate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$245 across 11 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
Additional practice locations (1)
- 3536 Picciola Cutoff RdFruitland Park, FL 34731-6309Phone: (352) 536-3660
Registry dates
- Enumerated
- 2017-10-30
- Last updated
- 2018-03-17
Frequently asked questions
- What is Karen Callahan's NPI number?
- Karen Callahan's National Provider Identifier (NPI) is 1538671672, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Callahan's specialty?
- Karen Callahan is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Karen Callahan located?
- Karen Callahan's practice location on file with NPPES is 607 Highway 466, Lady Lake, FL 32159-6338.
- What is Karen Callahan's phone number?
- The practice phone number listed in the NPPES registry for Karen Callahan is (352) 259-7994.
- Does Karen Callahan accept Medicare?
- Karen Callahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Callahan's NPI active?
- Yes — Karen Callahan's NPI (1538671672) is active in the NPPES registry as of the last update on 2018-03-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.