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

NPI Status: Active since January 10, 2006

Contact Information

5189 HOSPITAL RD
MARIPOSA, CA
ZIP 95338
Phone: (209) 966-2154
Fax: (866) 206-1883

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  • Individual
  • Male
  • Years of Experience 39
  • Internal Medicine
  • Endocrinology, Diabetes & Metabolism
  • May Accept Medicare Approved Payment
  • PECOS Enrolled

About ROBERT HORVAT

This page provides the complete NPI Profile along with additional information for Robert Horvat, an internist established in Mariposa, California with a medical specialization in Internal Medicine, focusing in endocrinology, diabetes & metabolism and more than 39 years of experience. The healthcare provider is registered in the NPI registry with number 1841279668 assigned on January 2006. The practitioner's primary taxonomy code is 207RE0101X with license number A062483 (CA). The provider is registered as an individual and his NPI record was last updated May 2026.

NPI
1841279668
Provider Name
DR. ROBERT THOMAS HORVAT MD, PHD
Gender
Male
Entity Type
Individual
Location Address
5189 HOSPITAL RD MARIPOSA, CA 95338
Location Phone
(209) 966-2154
Location Fax
(866) 206-1883
Mailing Address
2984 M ST MERCED, CA 95348
Mailing Phone
(415) 265-5000
Medical School Name
OTHER
Graduation Year
1987
Is Sole Proprietor?
Yes
Enumeration Date
01-10-2006
Last Update Date
05-14-2026
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An internist like Robert Horvat is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine Endocrinology, Diabetes & Metabolism

Taxonomy Code
207RE0101X
Type
Allopathic & Osteopathic Physicians
License No.
A062483
License State
CA
Taxonomy Description
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.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1207P00000XAllopathic & Osteopathic Physicians

Emergency Medicine

A062483 (CA)
2207R00000XAllopathic & Osteopathic Physicians

Internal Medicine

A62483 (CA)

Medicare Participation & PECOS Enrollment Status

Robert Horvat is registered with Medicare but maybe doesn't accept claims assignment. If you are a Medicare beneficiary call and confirm with the provider before seeking any services.

Robert Horvat is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 6608843370

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20040913000669

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Maybe

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Provider Referred Orders for Durable Medical Equipment, Devices & Supplies

The following list reflects the services, supplies or durable medical equipment ordered by this provider to a DME supplier on behalf of patients. The information below is derived from Medicare claims data and reflects the BETOS category, HCPCS code information and the number times each service was submitted under the Medicare fee-for-service program.

Durable Medical Equipment

  • DME-Other DME (DE017N)

    Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips (HCPCS:A4253)

    6 DME suppliers used 126 Medicare Claims 341 Services Paid

  • DME-Medical/Surgical Supplies (DA000N)

    Lancets, per box of 100 (HCPCS:A4259)

    3 DME suppliers used 34 Medicare Claims 44 Services Paid

  • DME-Other DME (DE017N)

    Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service (HCPCS:K0553)

    4 DME suppliers used 58 Medicare Claims 58 Services Paid

Physician Visit Costs

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 95338 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99204

  • Average New Patient Price $133.94
  • Minimum New Patient Price $58.87
  • Maximum New Patient Price $176.6
  • Average New Patient Copayment $33.48
  • Minimum New Patient Copayment $14.71
  • Maximum New Patient Copayment $44.15

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $103.36
  • Minimum Established Patient Price $19.28
  • Maximum Established Patient Price $144.6
  • Average Established Patient Copayment $25.84
  • Minimum Established Patient Copayment $4.82
  • Maximum Established Patient Copayment $36.15

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Reviews for DR. ROBERT THOMAS HORVAT MD, PHD

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1841279668, we treat the final digit (8) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 72. The final step is to find the difference between that total and the next multiple of ten (80 - 72 = 8).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
8
Unchanged
Pos 3
4
Doubled → 8
Pos 4
1
Unchanged
Pos 5
2
Doubled → 4
Pos 6
7
Unchanged
Pos 7
9
Doubled → 18 → 1 + 8
Pos 8
6
Unchanged
Pos 9
6
Doubled → 12 → 1 + 2
Check
8
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 4 → 8 2 → 4 9 → 18 → 9 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 8 + 8 + 1 + 4 + 7 + 1 + 8 + 6 + 1 + 2 + 24 = 72

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 72 is 80. The difference is the calculated check digit.

80 - 72 = 8
This NPI is valid
The calculated check digit is 8, which matches the last digit of 1841279668.

Other Providers at the Same Location


The following 20 providers are registered at the same or a nearby location.

Social Worker (Clinical)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Emergency Medicine
5189 HOSPITAL RD
MARIPOSA, CA 95338
Marriage & Family Therapist
5189 HOSPITAL RD
MARIPOSA, CA 95338
Emergency Medicine
5189 HOSPITAL RD, JOHN C. FREMONT HEALTHCARE DISTRICT
MARIPOSA, CA 95338
Psychologist (Clinical)
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Family Medicine
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Rural)
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Rural)
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Clinic/Center (Critical Access Hospital)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Family Medicine
5189 HOSPITAL RD
MARIPOSA, CA 95338
Family Medicine
5189 HOSPITAL RD
MARIPOSA, CA 95338
Family Medicine
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
General Acute Care Hospital (Critical Access)
5189 HOSPITAL RD
MARIPOSA, CA 95338
Skilled Nursing Facility
5189 HOSPITAL RD
MARIPOSA, CA 95338

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1841279668, enumerated as an "individual" on January 10, 2006.

The provider is located at 5189 HOSPITAL RD MARIPOSA, CA 95338 and the phone number is (209) 966-2154.

Internal Medicine with taxonomy code 207RE0101X and a focus in Endocrinology, Diabetes & Metabolism.