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ISAAC SERGEI HOROWITZ DO
NPI 1982167375
Pediatrics in Madera, CA

Active since April 11, 2019PECOS Enrolled
344 E 6TH ST, MADERA, CA 93638(559) 871-5844(559) 479-4812 Get Directions Write a Review

NPPES record last updated: September 17, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Sep 17, 2025, Nov 17, 2022, Jul 28, 2022 and 2 more (5 updates tracked since 2019).

About Isaac Sergei Horowitz Do NPPES

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

ISAAC SERGEI HOROWITZ DO (NPI 1982167375) is an individual pediatrics provider in Madera, California, licensed in California (20A20038) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1982167375
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameISAAC SERGEI HOROWITZCredential: DO
Location Address344 E 6TH STMadera, CA 93638-3631
Mailing Address344 E 6th StMadera, CA 93638-3631 · (559) 871-5844 · Fax (559) 479-4812
Phone(559) 871-5844
Fax(559) 479-4812
Sole ProprietorYes
Enumeration DateApril 11, 2019
Last NPPES UpdateSeptember 17, 20255 updates tracked since enumeration
NPPES CertifiedSeptember 17, 2025
✔ NPI 1982167375 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · 20A20038
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
344 E 6TH ST, Madera, CA 93638
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Isaac Sergei Horowitz Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 93638 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
$90.32 typical visit price
range $58.87 – $176.60
Typical copayment $22.58 (range $14.71 – $44.15)
Most-billed visit code 99203
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.

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.

SOLEDAD REYES FNP-C
Nurse Practitioner (Family)
344 E 6TH ST
MADERA, CA 93638
Madera County (559) 666-4000
DANIELA IVONNE ULLOA
Dentist
344 E 6TH ST
MADERA, CA 93638
Madera County (559) 664-4000
ALONDRA JUAREZ
Social Worker (Clinical)
344 E 6TH ST
MADERA, CA 93638
Madera County (559) 664-4000
MADHURI SHUKLA APRN
Nurse Practitioner
344 E 6TH ST
MADERA, CA 93638
Madera County (559) 664-4000
HARJEET K GILL NP
Nurse Practitioner (Family)
344 E 6TH ST
MADERA, CA 93638
Madera County (559) 664-4000
CAROLINA GUTIERREZ GARCIA
Family Medicine
344 E 6TH ST
MADERA, CA 93638
Madera County (442) 228-0681
DR. GERARD N MAZO MD
General Practice
344 E 6TH ST
MADERA, CA 93638
Madera County (559) 664-4000
GUILLERMO SANDOVAL MD
Pediatrics
344 E 6TH ST
MADERA, CA 93638
Madera County (559) 664-4000

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 Isaac Horowitz's NPI number?

The NPI number for Isaac Horowitz is 1982167375. It was assigned to this individual provider in the NPPES registry on April 11, 2019.

Where is Isaac Horowitz located?

Isaac Horowitz practices at 344 E 6th St, Madera, CA 93638. The listed phone number is (559) 871-5844.

What is Isaac Horowitz's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Isaac Horowitz enrolled in Medicare?

Yes. Isaac Horowitz is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Isaac Horowitz was last updated on September 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.