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DR. ROBERT THOMAS HORVAT MD, PHD
NPI 1841279668
Internal Medicine - Endocrinology, Diabetes & Metabolism in Mariposa, CA

Active since January 10, 2006PECOS Enrolled
5189 HOSPITAL RD, MARIPOSA, CA 95338(209) 966-2154(866) 206-1883 Get Directions Write a Review

NPPES record last updated: May 14, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Dr. Robert Thomas Horvat Md, Phd NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ROBERT THOMAS HORVAT MD, PHD (NPI 1841279668) is an individual endocrinology, diabetes & metabolism provider in Mariposa, California, licensed in California (A062483) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1987).

NPPES Registry Identity

NPI1841279668
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameDR. ROBERT THOMAS HORVATCredential: MD, PHD
Location Address5189 HOSPITAL RDMariposa, CA 95338-9524
Mailing Address2984 M StMerced, CA 95348-3214 · (415) 265-5000
Phone(209) 966-2154
Fax(866) 206-1883
Sole ProprietorYes
Medical School CMSOtherGraduated 1987
Enumeration DateJanuary 10, 2006
Last NPPES UpdateMay 14, 2026
NPPES CertifiedMay 14, 2026
✔ NPI 1841279668 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in CA · A062483
Definition

An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.

Also ListedEmergency MedicineTaxonomy 207P00000X · License A062483 (CA)
Also ListedInternal MedicineTaxonomy 207R00000X · License A62483 (CA)
5189 HOSPITAL RD, Mariposa, CA 95338
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Robert Thomas Horvat Md, Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6608843370
PECOS Enrollment IDI20040913000669
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95338 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$133.94 typical visit price
range $58.87 – $176.60
Typical copayment $33.48 (range $14.71 – $44.15)
Most-billed visit code 99204
Established Patient
$103.36 typical visit price
range $19.28 – $144.60
Typical copayment $25.84 (range $4.82 – $36.15)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
6 suppliers126 claims341 services$5.88 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
3 suppliers34 claims44 services$1.02 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
4 suppliers58 claims58 services$194.73 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MS. BETTY JONE MASSEY LCSW
Social Worker (Clinical)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Mariposa County (209) 966-3631
DR. JOSEPH E. C. ROGERS MD
Emergency Medicine
5189 HOSPITAL RD
MARIPOSA, CA 95338
Mariposa County (209) 966-3631
MS. RENEE L. ROPER M.A., LMFT
Marriage & Family Therapist
5189 HOSPITAL RD
MARIPOSA, CA 95338
Mariposa County (209) 966-0850
SIERRA RURAL PHYSICIANS, INC.
Emergency Medicine
5189 HOSPITAL RD, JOHN C. FREMONT HEALTHCARE DISTRICT
MARIPOSA, CA 95338
Mariposa County (209) 966-3631
DR. LORI LYNN ALLEN-RITTER PH.D
Psychologist (Clinical)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Mariposa County (209) 966-0850
JOHN C FREMONT HEALTHCARE DISTRICT
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Mariposa County (209) 966-3631
JOHN C. FREMONT HEALTHCARE DISTRICT
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Mariposa County (209) 966-3631
JOHN C FREMONT HEALTHCARE DISTRICT
Family Medicine
5189 HOSPITAL RD
MARIPOSA, CA 95338
Mariposa County (209) 966-3631

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Robert Horvat's NPI number?

The NPI number for Robert Horvat is 1841279668. It was assigned to this individual provider in the NPPES registry on January 10, 2006.

Where is Robert Horvat located?

Robert Horvat practices at 5189 Hospital Rd, Mariposa, CA 95338. The listed phone number is (209) 966-2154.

What is Robert Horvat's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Robert Horvat enrolled in Medicare?

Yes. Robert Horvat is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Robert Horvat was last updated on May 14, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.