Provider Profile
Karen O. Callahan, ARNP
Unclaimed ProfileAbout Karen Callahan
Karen O. Callahan, ARNP is a nurse practitioner based in Lady Lake, FL. According to Medicare claims data, Karen cared for 1,035 Medicare patients across 1,912 services. The services billed most often include established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and injection, dexamethasone sodium phosphate, 1 mg.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (352) 259-7994
- Email not available
Practice Locations
607 HIGHWAY 466
Lady Lake, FL 32159
3536 Picciola Cutoff Rd
Fruitland Park, FL 34731
Procedures Most Often Billed to Medicare
1,912 services · 1,035 patients · 12 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of impacted ear wax | Procedure | 69210 |
12 | Less often than most peers in Nurse Practitioner |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
45 | More often than most peers in Nurse Practitioner |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
42 | As often as other peers in Nurse Practitioner |
| Injection, dexamethasone sodium phosphate, 1 mg | Drug given | J1100 |
107 | Less often than most peers in Nurse Practitioner |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
774 | More than most peers in Nurse Practitioner |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
748 | More than most peers in Nurse Practitioner |
| Urinalysis, manual test | Lab test | 81002 |
86 | More than most peers in Nurse Practitioner |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
27 | As often as other peers in Nurse Practitioner |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
22 | Less often than most peers in Nurse Practitioner |
| Detection test by immunoassay with direct visual observation for influenza virus | Lab test | 87804 |
21 | Less often than most peers in Nurse Practitioner |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 3
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other nurse practitioners in Lady Lake 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2017 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Removal of impacted ear wax 8
Providers in FL who bill this service to Medicare most often.
Common questions
What does Karen O. Callahan specialize in?
Karen O. Callahan is a nurse practitioner in Lady Lake, FL. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Karen O. Callahan located?
Karen O. Callahan is listed at 607 Highway 466, Lady Lake, FL 32159. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Karen O. Callahan's phone number?
The number on file is (352) 259-7994. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Karen O. Callahan's NPI number?
Karen O. Callahan's National Provider Identifier is 1538671672. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Karen O. Callahan train?
Karen O. Callahan attended Other, graduating in 2017. This comes from the CMS National Downloadable File.
CMS public data
How long has Karen O. Callahan been practicing?
Karen O. Callahan has 9 years experience. Calculated from a graduation year of 2017, reported in the CMS National Downloadable File.
CMS public data
What does Karen O. Callahan do most often?
According to Medicare billing data, Karen O. Callahan performs procedures including removal of impacted ear wax; provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report and injection of drug or substance under skin or into muscle, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Karen O. Callahan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Karen O. Callahan. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.