Karen Olivia Callahan, ARNP
- Medicare patients, 2024
- 551
- Part D claims, 2024
- 6,799
- MIPS score, 2024
- 100
- Hospital affiliations
- 1
- Industry payments
- $65
- Practice address
- 607 Hwy 466, Lady Lake, FL 32159-3792
- Practice phone
- Call (352) 259-7994
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Lady Lake Family Medicine
Primary care practice · Lady Lake, Florida
Find Karen Callahan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Karen Olivia Callahan is a nurse practitioner in Lady Lake, Florida
Karen Callahan practices at Lady Lake Family Medicine in Lady Lake, Florida.
Karen Callahan's NPI, 1538671672, was assigned on October 30, 2017. Karen Callahan holds Florida license 9249882.
- NPI
- 1538671672NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4183983414
- NPI enumeration date
- October 30, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (352) 259-7994
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Karen Olivia Callahan practices at Lady Lake Family Medicine in Lady Lake, Florida
Karen Callahan's primary practice is Lady Lake Family Medicine, at 607 Hwy 466, Lady Lake, FL 32159-3792. The practice phone is (352) 259-7994.
- Lady Lake Family Medicine607 Hwy 466, Lady Lake, FL 32159-3792Phone(352) 259-7994
Source: Dmand AI Affiliation Data
Karen Olivia Callahan is affiliated with 6 sites of care and 3 medical groups
Karen Callahan's primary practice is Lady Lake Family Medicine in Lady Lake, Florida. Karen Callahan is also affiliated with UF Health Spanish Plaines Hospital. The medical group on file is Lady Lake Family Medicine. Dmand AI also links Karen Callahan to 2 more home health agencies, 2 medical groups, 1 group practice or clinic and 1 therapy and rehab clinic, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Karen Olivia Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Karen Callahan practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lady Lake Family Medicine | Available with a free account |
| +5 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Karen Olivia Callahan is one of 5,914 nurse practitioners in Florida
Nurse practitioner is Karen Callahan's primary specialty in the NPI Registry, under taxonomy code 363L00000X. Karen Callahan is licensed in Florida.
Specialties and state licenses
- Nurse practitioner, FloridaPrimary
Nurse practitioners near Karen Callahan
Counts of nurse practitioners with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Karen Olivia Callahan treated 551 Medicare patients in 2024, average age 75
CMS counts 551 Medicare patients who saw Karen Callahan in 2024. The largest group is 65 to 74, with 271 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.03, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Karen Callahan's median patient age at 72, with 63% women.
Karen Callahan's Medicare patients by age, 2024
Karen Callahan's Medicare patients by sex, 2024
- Women33861%
- Men21339%
Chronic conditions among Karen Callahan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis49%
- Ischemic heart disease29%
- Diabetes23%
- Chronic kidney disease22%
- Atrial fibrillation20%
- Cancer18%
Share of Medicare patients with each condition. A patient can have several.
Karen Callahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women63%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Karen Olivia Callahan wrote 6,799 Medicare Part D claims in 2024
In 2024, Karen Callahan wrote 6,799 Medicare Part D claims for 785 patients. 87% of them were for generic drugs.
Karen Callahan's Part D claims by kind of drug, 2024
- Generic5,900 claims87%
- Brand-name885 claims13%
- Other14 claims0%
Drug classes CMS tracks in Karen Callahan's Part D claims, 2024
- Opioids1%55 of 6,799 claims
- Antibiotics4%272 of 6,799 claims
- Antipsychotics, patients 65 and over0%22 of 6,799 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Karen Olivia Callahan scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Karen Callahan for performance year 2024, reported individually. Karen Callahan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Karen Callahan's MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Karen Olivia Callahan received $65 in industry payments in 2025
CMS Open Payments shows 3 general payments to Karen Callahan from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $41.
Companies that paid Karen Callahan the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Karen Olivia Callahan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Karen Olivia Callahan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Karen Olivia Callahan's NPI number?
Karen Olivia Callahan's NPI number is 1538671672. It was assigned on October 30, 2017, and it is active in the NPI Registry.
What does Karen Olivia Callahan specialize in?
Karen Olivia Callahan is a nurse practitioner in Lady Lake, Florida. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does Karen Olivia Callahan practice?
Karen Callahan practices at 607 Hwy 466, Lady Lake, FL 32159-3792. Karen Callahan's primary practice is Lady Lake Family Medicine in Lady Lake, Florida. Dmand AI also links Karen Callahan to 2 home health agencies, 2 medical groups, 1 group practice or clinic and 1 therapy and rehab clinic.
What is Karen Olivia Callahan's office phone number?
The practice phone on file for Karen Callahan is (352) 259-7994.
What is Karen Olivia Callahan's medical license number?
Karen Callahan holds Florida license 9249882.
Which hospitals is Karen Olivia Callahan affiliated with?
Karen Callahan is affiliated with UF Health Spanish Plaines Hospital.
What medical group is Karen Olivia Callahan part of?
Karen Callahan is linked to Lady Lake Family Medicine. Dmand AI links Karen Callahan to 2 more medical groups.
Does Karen Olivia Callahan accept Medicare?
Yes. CMS lists Karen Callahan as accepting Medicare assignment.
What is Karen Olivia Callahan's MIPS score?
Karen Callahan's MIPS final score for performance year 2024 is 100 out of 100, reported individually.
How many Medicare patients does Karen Olivia Callahan see?
CMS counts 551 Medicare patients who saw Karen Callahan in 2024, with an average age of 75.
Has Karen Olivia Callahan received payments from drug or device companies?
CMS Open Payments shows $65 in general payments to Karen Callahan from 2 companies from 2025 to 2025. The largest total came from Exact Sciences Corporation.
How long has Karen Olivia Callahan been practicing?
Karen Callahan graduated from medical school in 2017, 9 years ago.
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