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DR. JANET MARGARET HORENSTEIN MD
NPI 1588759062
Obstetrics & Gynecology - Maternal & Fetal Medicine in Los Angeles, CA

Active since October 03, 2006PECOS Enrolled
1400 S. GRAND AVENUE, SUITE 711, LOS ANGELES, CA 90015(213) 741-1406(213) 765-7321 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Janet Margaret Horenstein Md NPPES

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

DR. JANET MARGARET HORENSTEIN MD (NPI 1588759062) is an individual maternal & fetal medicine provider in Los Angeles, California, licensed in California (A35255) and active in the NPI registry since October 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1588759062
Entity TypeIndividualFemale
Primary Taxonomy207VM0101X
Provider Legal NameDR. JANET MARGARET HORENSTEINCredential: MD
Location Address1400 S. GRAND AVENUE, SUITE 711Los Angeles, CA 90015
Mailing Address1400 S. Grand Avenue, Suite 711Los Angeles, CA 90015 · (213) 741-1406 · Fax (213) 765-7321
Phone(213) 741-1406
Fax(213) 765-7321
Sole ProprietorYes
Enumeration DateOctober 3, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1588759062 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & Gynecology · Maternal & Fetal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207VM0101X
License✔ Licensed in CA · A35255
Definition
An obstetrician/gynecologist who cares for, or provides consultation on, patients with complications of pregnancy. This specialist has advanced knowledge of the obstetrical, medical and surgical complications of pregnancy and their effect on both the mother and the fetus. The specialist also possesses expertise in the most current diagnostic and treatment modalities used in the care of patients with complicated pregnancies.
1400 S. GRAND AVENUE, Los Angeles, CA 90015
Open in Google Maps ↗

Other Identifiers 1

OtherOOA352550CA · Medi-cal

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Janet Margaret Horenstein Md 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 Reassignments

2

Medicare enrollment records show Janet Horenstein reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Faculty Physicians And Surgeons Of Llusm
8.1 mi
Transplant Surgery
1505 WILSON TERRACE, SUITE 155
Glendale, CA 91206
  • Reassigned Medicare billing, California enrollment
  • 2,584 clinicians in this Medicare group
NPI 1508255175 (909) 558-3636
Specialty Obstetrics Of San Diego
106 mi
Maternal & Fetal Medicine
3750 CONVOY ST STE 200
San Diego, CA 92111
  • Reassigned Medicare billing, California enrollment
  • 5 clinicians in this Medicare group
NPI 1447583570 (858) 794-7700

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 90015 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
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

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

GRISELDA GARCIA
Social Worker
1400 S. GRAND AVENUE
LOS ANGELES, CA 90015
Los Angeles County (213) 742-6250

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 Janet Horenstein's NPI number?

The NPI number for Janet Horenstein is 1588759062. It was assigned to this individual provider in the NPPES registry on October 3, 2006.

Where is Janet Horenstein located?

Janet Horenstein practices at 1400 S. Grand Avenue Suite 711, Los Angeles, CA 90015. The listed phone number is (213) 741-1406.

What is Janet Horenstein's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.

Is Janet Horenstein enrolled in Medicare?

Yes. Janet Horenstein is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Janet Horenstein's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Janet Horenstein reassigns Medicare benefits to 2 organizations: Faculty Physicians And Surgeons Of Llusm (Glendale, CA) and Specialty Obstetrics Of San Diego (San Diego, CA). Each 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 Janet Horenstein'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 Janet Horenstein was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.