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ISABEL ROSE OSTRER
NPI 1912587726
Internal Medicine in San Francisco, CA

Active since April 14, 2021PECOS Enrolled
1001 POTRERO AVENUE BLDG 5 FL 1M, SAN FRANCISCO, CA 94110(628) 206-8494(628) 206-3012 Get Directions Write a Review

NPPES record last updated: July 19, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jul 19, 2024, Apr 8, 2024, Apr 14, 2021 (3 updates tracked since 2021).

About Isabel Rose Ostrer NPPES

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

ISABEL ROSE OSTRER (NPI 1912587726) is an individual internal medicine provider in San Francisco, California, licensed in California (A192326) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS and maintains a secondary practice location in San Francisco.

NPPES Registry Identity

NPI1912587726
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameISABEL ROSE OSTRER
Location Address1001 POTRERO AVENUE BLDG 5 FL 1MSan Francisco, CA 94110
Mailing Address505 Parnassus Ave Rm M-1480San Francisco, CA 94143-2204
Phone(628) 206-8494
Fax(628) 206-3012
Sole ProprietorNo
Enumeration DateApril 14, 2021
Last NPPES UpdateJuly 19, 20243 updates tracked since enumeration
NPPES CertifiedJuly 19, 2024
✔ NPI 1912587726 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A192326
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1001 POTRERO AVENUE BLDG 5 FL 1M, San Francisco, CA 94110
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Secondary Practice Location 1

Location 1505 Parnassus Ave Rm M-1480San Francisco, CA 94143-2204 · Phone (415) 476-1000

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Isabel Rose Ostrer 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 Isabel Ostrer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

City & County Of San Francisco
Same address
General Acute Care Hospital
1001 POTRERO AVE, BUILDING 5, WARD 1B
San Francisco, CA 94110
  • Reassigned Medicare billing, California enrollment
  • 1,573 clinicians in this Medicare group
NPI 1083648810 (415) 759-4067
University Of California Sfgh Medical Group
Same address
Hospice and Palliative Medicine
1001 POTRERO AVE, RM. 5H22
San Francisco, CA 94110
  • Reassigned Medicare billing, California enrollment
  • 637 clinicians in this Medicare group
NPI 1073836060 (415) 206-8317

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 94110 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
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.

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 Isabel Ostrer's NPI number?

The NPI number for Isabel Ostrer is 1912587726. It was assigned to this individual provider in the NPPES registry on April 14, 2021.

Where is Isabel Ostrer located?

Isabel Ostrer practices at 1001 Potrero Avenue Bldg 5 Fl 1M, San Francisco, CA 94110. The listed phone number is (628) 206-8494.

What is Isabel Ostrer's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Isabel Ostrer enrolled in Medicare?

Yes. Isabel Ostrer is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Isabel Ostrer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Isabel Ostrer reassigns Medicare benefits to 2 organizations: City & County Of San Francisco (San Francisco, CA) and University Of California Sfgh Medical Group (San Francisco, 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 Isabel Ostrer'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 Isabel Ostrer was last updated on July 19, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.