William W. Horn Jr., NP
- Medicare patients, 2024
- 203
- Part D claims, 2024
- 125
- MIPS score, 2024
- 84
- Hospital affiliations
- 1
- Industry payments
- $124
- Practice address
- 4500 San Pablo Rd, Jacksonville, FL 32224
- Practice phone
- Call (904) 953-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find William Horn'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.
William W. Horn Jr. is a nurse practitioner in Jacksonville, Florida
William Horn practices at Mayo Clinic Hospital in Jacksonville, Florida, part of Mayo Clinic.
William Horn's NPI, 1518928019, was assigned on April 1, 2006. William Horn holds Florida license ARNP3027962.
- NPI
- 1518928019NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4880636604
- NPI enumeration date
- April 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (904) 953-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
William W. Horn Jr. practices at Mayo Clinic Hospital in Jacksonville, Florida
William Horn's primary practice is Mayo Clinic Hospital, at 4500 San Pablo Rd, Jacksonville, FL 32224 in Duval County. The practice phone is (904) 953-2000.
- Mayo Clinic Hospital4500 San Pablo Rd, Jacksonville, FL 32224 · Duval CountyPhone(904) 953-2000
Source: Dmand AI Affiliation Data
William W. Horn Jr. is affiliated with 1 site of care and 2 medical groups
William Horn's primary practice is Mayo Clinic Hospital in Jacksonville, Florida, part of Mayo Clinic. The medical group on file is Mayo Clinic Jacksonville. Dmand AI also links William Horn to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at William W. Horn Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where William Horn practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mayo Clinic Hospital | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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William W. Horn Jr. is one of 5,914 nurse practitioners in Florida
Nurse practitioner is William Horn's primary specialty in the NPI Registry, under taxonomy code 363L00000X. William Horn is licensed in Florida.
Specialties and state licenses
- Nurse practitioner, FloridaPrimary
Nurse practitioners near William Horn
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
William W. Horn Jr. treated 203 Medicare patients in 2024, average age 74
CMS counts 203 Medicare patients who saw William Horn in 2024. The largest group is 65 to 74, with 98 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 7% are also on Medicaid. Their average risk score is 1.75, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts William Horn's median patient age at 55, with 53% women.
William Horn's Medicare patients by age, 2024
William Horn's Medicare patients by sex, 2024
- Women9748%
- Men10652%
Chronic conditions among William Horn's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis67%
- Mood disorders51%
- Stroke or TIA51%
- Depression47%
- Anxiety46%
- Ischemic heart disease43%
Share of Medicare patients with each condition. A patient can have several.
William Horn's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
William W. Horn Jr. wrote 125 Medicare Part D claims in 2024
In 2024, William Horn wrote 125 Medicare Part D claims for 69 patients. 98% of them were for generic drugs.
William Horn's Part D claims by kind of drug, 2024
- Generic122 claims98%
- Brand-name and other3 claims2%
Drug classes CMS tracks in William Horn's Part D claims, 2024
- Opioids27%34 of 125 claims
- Antibiotics10%12 of 125 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
William W. Horn Jr. scored 84 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 84 out of 100 for William Horn for performance year 2024, reported as part of a group. William Horn accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
William Horn's MIPS scores, performance year 2024
- 84of 100Final score
- 74.8of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 73of 100Cost
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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William W. Horn Jr. received $124 in industry payments in 2025
CMS Open Payments shows 1 general payment to William Horn from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Sanofi and Genzyme US Companies paid the most, $124.
Companies that paid William Horn 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 William W. Horn Jr.'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 DataDmand AI Org Hierarchy 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 William W. Horn Jr.
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is William W. Horn Jr.'s NPI number?
William W. Horn Jr.'s NPI number is 1518928019. It was assigned on April 1, 2006, and it is active in the NPI Registry.
What does William W. Horn Jr. specialize in?
William W. Horn Jr. is a nurse practitioner in Jacksonville, Florida. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does William W. Horn Jr. practice?
William Horn practices at 4500 San Pablo Rd, Jacksonville, FL 32224. William Horn's primary practice is Mayo Clinic Hospital in Jacksonville, Florida, part of Mayo Clinic. Dmand AI also links William Horn to 1 medical group.
What is William W. Horn Jr.'s office phone number?
The practice phone on file for William Horn is (904) 953-2000.
What is William W. Horn Jr.'s medical license number?
William Horn holds Florida license ARNP3027962.
Which hospitals is William W. Horn Jr. affiliated with?
William Horn practices at Mayo Clinic Hospital in Jacksonville, Florida.
What medical group is William W. Horn Jr. part of?
William Horn is linked to Mayo Clinic Jacksonville. Dmand AI links William Horn to 1 more medical group.
Does William W. Horn Jr. accept Medicare?
Yes. CMS lists William Horn as accepting Medicare assignment.
What is William W. Horn Jr.'s MIPS score?
William Horn's MIPS final score for performance year 2024 is 84 out of 100, reported as part of a group.
How many Medicare patients does William W. Horn Jr. see?
CMS counts 203 Medicare patients who saw William Horn in 2024, with an average age of 74.
Has William W. Horn Jr. received payments from drug or device companies?
CMS Open Payments shows $124 in general payments to William Horn from 1 company from 2025 to 2025. The largest total came from Sanofi and Genzyme US Companies.
How long has William W. Horn Jr. been practicing?
William Horn graduated from medical school in 2004, 22 years ago.
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