DR. KATHERINE E TIERNEY M.D.
NPI 1669702502
Obstetrics & Gynecology - Gynecologic Oncology in Los Angeles, CA

Q: What is Katherine Tierney's NPI number?

The NPI number for Katherine Tierney is 1669702502. It was assigned to this individual provider in the NPPES registry on December 26, 2009.

Q: What is Katherine Tierney's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Gynecologic Oncology, with taxonomy code 207VX0201X.

Q: When was this NPI record last updated?

The NPPES record for Katherine Tierney was last updated on February 13, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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 December 26, 2009PECOS Enrolled

1516 SAN PABLO ST FL 3, LOS ANGELES, CA 90033(323) 276-3705 Get Directions Write a Review

NPPES record last updated: February 13, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Feb 13, 2025, Feb 4, 2022, Jun 16, 2021 (3 updates tracked since 2021).

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About Dr. Katherine E Tierney M.d. NPPES

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

DR. KATHERINE E TIERNEY M.D. (NPI 1669702502) is an individual gynecologic oncology provider in Los Angeles, California, licensed in California (A110278) and active in the NPI registry since December 2009. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1669702502

Entity TypeIndividualFemale

Primary Taxonomy207VX0201X

Provider Legal NameDR. KATHERINE E TIERNEYCredential: M.D.

Location Address1516 SAN PABLO ST FL 3Los Angeles, CA 90033-5313

Mailing AddressPo Box 31309Los Angeles, CA 90031-0309 · (626) 457-6601

Phone(323) 276-3705

Sole ProprietorNo

Enumeration DateDecember 26, 2009

Last NPPES UpdateFebruary 13, 20253 updates tracked since enumeration

NPPES CertifiedFebruary 13, 2025

✔ NPI 1669702502 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyObstetrics & Gynecology · Gynecologic OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207VX0201X

License✔ Licensed in CA · A110278

Definition

An obstetrician/gynecologist who provides consultation and comprehensive management of patients with gynecologic cancer, including those diagnostic and therapeutic procedures necessary for the total care of the patient with gynecologic cancer and resulting complications.

Also ListedObstetrics & GynecologyTaxonomy 207V00000X · License A110278 (CA), MD60688841 (WA)

1516 SAN PABLO ST FL 3, Los Angeles, CA 90033

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Katherine E Tierney M.d. 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

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

Usc Care Medical Group, Inc

Same address

General Practice

1520 SAN PABLO ST
Los Angeles, CA 90033

Reassigned Medicare billing, California enrollment
2,445 clinicians in this Medicare group

NPI 1902846306 (323) 442-5955

South Salem Rehabilitation, LLC

789 mi

Skilled Nursing Facility

3445 BOONE RD SE
Salem, OR 97317

Reassigned Medicare billing, Oregon and Washington enrollments
Medicare enrollment name: Kaiser Foundation Health Plan Of The Northwest
Also billed through NPI 1871848457 (Washington)
3,207 clinicians in this Medicare group

NPI 1215071998 (503) 576-3000

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 90033 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

$187.60 typical visit price

range $62.96 – $187.60

Typical copayment $46.90 (range $15.74 – $46.90)

Most-billed visit code 99205

Established Patient

$109.96 typical visit price

range $20.84 – $153.61

Typical copayment $27.49 (range $5.21 – $38.40)

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 3

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

DR. MONICA NEUMAN MD

Obstetrics & Gynecology (Gynecologic Oncology)

1516 SAN PABLO ST FL 3
LOS ANGELES, CA 90033

Los Angeles County (323) 276-3705

XIAOYUE MONA GUO MD

Obstetrics & Gynecology (Gynecologic Oncology)

1516 SAN PABLO ST FL 3
LOS ANGELES, CA 90033

Los Angeles County (323) 276-3705

TANAZ R. FERZANDI M.D., M.A.

Obstetrics & Gynecology (Urogynecology and Reconstructive Pelvic Surgery)

1516 SAN PABLO ST FL 3
LOS ANGELES, CA 90033

Los Angeles County (323) 276-3705

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 Katherine Tierney's NPI number?

The NPI number for Katherine Tierney is 1669702502. It was assigned to this individual provider in the NPPES registry on December 26, 2009.

Where is Katherine Tierney located?

Katherine Tierney practices at 1516 San Pablo St Fl 3, Los Angeles, CA 90033. The listed phone number is (323) 276-3705.

What is Katherine Tierney's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Gynecologic Oncology, with taxonomy code 207VX0201X.

Is Katherine Tierney enrolled in Medicare?

Yes. Katherine Tierney is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Katherine Tierney's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Tierney reassigns Medicare benefits to 2 organizations: Usc Care Medical Group, Inc (Los Angeles, CA) and South Salem Rehabilitation, LLC (Salem, OR). 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 Katherine Tierney'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 Katherine Tierney was last updated on February 13, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.