ISAAC SERGEI HOROWITZ DO
NPI 1982167375
Pediatrics in Madera, CA

Q: 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.

Q: What is Isaac Horowitz's specialty?

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

Q: 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 13 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.

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: October 25, 2026.

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

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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, billing reassignment, and ordering and referring status from CMS.

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.

Medicare Billing Reassignment

Medicare enrollment records show Isaac Horowitz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Camarena Health

Same address

Federally Qualified Health Center (FQHC)

344 E 6TH STREET
Madera, CA 93638

Reassigned Medicare billing, California enrollment
142 clinicians in this Medicare group

NPI 1891778114 (559) 664-4000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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

ALEXANDRIA SHEREE ROMERO PA-C

Physician Assistant

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

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.

Which organization bills Medicare for Isaac Horowitz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Isaac Horowitz reassigns Medicare benefits to Camarena Health (Madera, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Isaac Horowitz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

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 13 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.