Dr. Robert Thomas Horvat, MD, PhD
- Part D claims, 2024
- 2,531
- Hospital affiliations
- 4
- Industry payments
- $69
- Medical group
- 1
- Insurance carriers
- 14
- Practice address
- 5189 Hospital Road, Mariposa, CA 95338
- Practice phone
- Call (209) 966-3631
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Horvat'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.
Dr. Robert Thomas Horvat is an endocrinologist in Mariposa, California
Dr. Horvat practices at John C. Fremont Healthcare District in Mariposa, California, part of John C Fremont Healthcare District.
Dr. Horvat's NPI, 1841279668, was assigned on January 10, 2006. Dr. Horvat graduated from University of Zagreb Faculty of Medicine in 1987. Dr. Horvat holds California license A062483.
- NPI
- 1841279668NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6608843370
- NPI enumeration date
- January 10, 2006
- NPI status
- Active
- Practice phone
- (209) 966-3631
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Robert Thomas Horvat practices at John C. Fremont Healthcare District in Mariposa, California
Dr. Horvat's primary practice is John C. Fremont Healthcare District, at 5189 Hospital Road, Mariposa, CA 95338 in Mariposa County. The practice phone is (209) 966-3631.
- John C. Fremont Healthcare District5189 Hospital Road, Mariposa, CA 95338 · Mariposa CountyPhone(209) 966-3631
Source: Dmand AI Affiliation Data
Dr. Robert Thomas Horvat is affiliated with 4 sites of care and 1 medical group
Dr. Horvat's primary practice is John C. Fremont Healthcare District in Mariposa, California, part of John C Fremont Healthcare District. Dr. Horvat is also affiliated with Saint Agnes Medical Center. The medical group on file is John C. Fremont Healthcare District. Dmand AI also links Dr. Horvat to 2 more hospitals, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Robert Thomas Horvat's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Horvat practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| John C. Fremont Healthcare District | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across John C Fremont Healthcare District and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Robert Thomas Horvat is one of 1,062 endocrinologists in California
Endocrinology, diabetes and metabolism is Dr. Horvat's primary specialty in the NPI Registry, under taxonomy code 207RE0101X. Dr. Horvat is licensed in California.
Specialties and state licenses
- Endocrinology, diabetes and metabolism, CaliforniaPrimary
Endocrinologists near Dr. Horvat
Counts of endocrinologists 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
Dr. Robert Thomas Horvat's patients have a median age of 72
Across all payers, Dmand AI patient panel data puts Dr. Horvat's median patient age at 72, with 67% women.
Dr. Horvat'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
- Women67%
- Men33%
Source: Dmand AI Patient Panel Data
Dr. Robert Thomas Horvat wrote 2,531 Medicare Part D claims in 2024
In 2024, Dr. Horvat wrote 2,531 Medicare Part D claims for 331 patients. 59% of them were for generic drugs. CMS names the drug for 2,333 of them, across 32 drugs with 11 or more claims each, at $821,891 in total drug cost. In 2023, CMS named 1,687 claims across 26 drugs.
Dr. Horvat's Part D claims by kind of drug, 2024
- Generic1,483 claims59%
- Brand-name933 claims37%
- Other115 claims5%
Dr. Horvat's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,6872024: 2,33338%
Drugs named by CMS: 32 in 2024, 26 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Robert Thomas Horvat received $69 in industry payments from 2016 to 2025
CMS Open Payments shows 4 general payments to Dr. Horvat from 3 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $24.
General payments to Dr. Horvat by program year, 2016 to 2025
Companies that paid Dr. Horvat the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert Thomas Horvat graduated from University of Zagreb Faculty of Medicine
Dr. Horvat graduated from University of Zagreb Faculty of Medicine in 1987.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Robert Thomas Horvat accepts plans from 14 insurance carriers
Dr. Horvat is in network with 14 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Elevance
- United Healthcare
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- Regence Health Plans
- Alliant Health Plans
- +6 more carriersWith a free account
Plan types Dr. Horvat accepts, by number of carriers
- PPO9
- Medicare7
- HMO6
- EPO4
- POS3
Source: Dmand AI Insurance Network Data
Sources for Dr. Robert Thomas Horvat'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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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 Dr. Robert Thomas Horvat
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Robert Thomas Horvat's NPI number?
Dr. Robert Thomas Horvat's NPI number is 1841279668. It was assigned on January 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert Thomas Horvat?
Dr. Robert Thomas Horvat is an endocrinologist in Mariposa, California. The primary specialty in the NPI Registry is Endocrinology, Diabetes & Metabolism Physician (taxonomy code 207RE0101X).
Where does Dr. Robert Thomas Horvat practice?
Dr. Horvat practices at 5189 Hospital Road, Mariposa, CA 95338. Dr. Horvat's primary practice is John C. Fremont Healthcare District in Mariposa, California, part of John C Fremont Healthcare District. Dmand AI also links Dr. Horvat to 2 hospitals.
What is Dr. Robert Thomas Horvat's office phone number?
The practice phone on file for Dr. Horvat is (209) 966-3631.
What is Dr. Robert Thomas Horvat's medical license number?
Dr. Horvat holds California license A062483.
Which hospitals is Dr. Robert Thomas Horvat affiliated with?
Dr. Horvat practices at John C. Fremont Healthcare District in Mariposa, California. Dr. Horvat is also affiliated with Saint Agnes Medical Center. Dmand AI links Dr. Horvat to 2 more hospitals.
What medical group is Dr. Robert Thomas Horvat part of?
Dr. Horvat is linked to John C. Fremont Healthcare District.
Where did Dr. Robert Thomas Horvat go to medical school?
Dr. Horvat graduated from University of Zagreb Faculty of Medicine in 1987.
What drugs does Dr. Robert Thomas Horvat prescribe most?
In 2024 Medicare Part D data, Dr. Horvat's most prescribed drugs by claims were Levothyroxine Sodium, Metformin HCl and Alendronate Sodium.
Has Dr. Robert Thomas Horvat received payments from drug or device companies?
CMS Open Payments shows $69 in general payments to Dr. Horvat from 3 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Robert Thomas Horvat been practicing?
Dr. Horvat graduated from medical school in 1987, 39 years ago.
What insurance does Dr. Robert Thomas Horvat accept?
Dr. Horvat is in network with 14 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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