Katherine E. Tierney, M.D.
Gynecologic Oncology Physician · Los Angeles, CA
Katherine E. Tierney, M.D. is a gynecologic oncology physician with a practice address in Los Angeles, California, and NPI 1669702502, issued on Dec 26, 2009. Check the license (California A110278, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katherine E. Tierney
- Credential
- M.D.
- Primary taxonomy
- Gynecologic Oncology Physician 207VX0201X
- License numbers
- A110278 CA
MD60688841 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1516 San Pablo St FL 3, Los Angeles, CA 90033
- Phone
- (323) 276-3705
- Enumerated
- Dec 26, 2009
- Record last updated
- Feb 13, 2025
- Entity
- Type 1 · individual
8 nearest gynecologic oncology physician records → All 176 in California → Look up another NPI →
Also registered at 1516 San Pablo St FL 3
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tanaz Ferzandi, M.D., M.A.Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician1952382756
- Xiaoyue Guo, MDGynecologic Oncology Physician1477915601
- Monica Neuman, MDGynecologic Oncology Physician1114457942
- Anna Reinert, M.D.Obstetrics & Gynecology Physician1063767952
Verify Katherine E. Tierney in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A110278Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average gynecologic oncology physician in 2024
38 Medicare Part D claims for 27 beneficiaries, against an average of 195 among the 1,475 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
Most prescribed
- Oxycodone Hcl13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $141.22
2 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 1,199 providers of this specialty with any payment received $6,387.20 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Katherine E. Tierney among 176 gynecologic oncology physician records in California
Katherine E. Tierney, M.D. is one of 176 gynecologic oncology physician records with a practice address in California. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 65% of them.
- NPI issued2009 · 65% of these records are older, 31% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileNo · 74% of these records are
- Record last updated2025 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VX0201X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gynecologic Oncology Physician providers in California
There are 176 gynecologic oncology physician records in California.
All 176 in California → Every provider in Los Angeles → Gynecologic Oncology Physician nationwide →
The 8 gynecologic oncology physician records with the nearest ZIP codes
- Antonio CastanedaLos Angeles, CA 900331447618376
- Xiaoyue Guo, MDLos Angeles, CA 900331477915601
- Laila Muderspach, M.D.Los Angeles, CA 900331306841648
- Monica Neuman, MDLos Angeles, CA 900331114457942
- Scott Lentz, MDLos Angeles, CA 900271477620490
- Eijean Wu, MD, MPPLos Angeles, CA 900271396024600
- James Heaps, M.D.Los Angeles, CA 900241912919200
- Dandi Huang, MDLos Angeles, CA 900481407382427
Common questions
What is Katherine E. Tierney, M.D.'s NPI number?
Katherine E. Tierney, M.D.'s National Provider Identifier (NPI) is 1669702502, issued on Dec 26, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Katherine E. Tierney, M.D. located?
The NPPES record lists a practice address at 1516 San Pablo St FL 3, Los Angeles, CA, 90033. Phone: (323) 276-3705. Providers update this record themselves, so call before visiting.
How can I verify Katherine E. Tierney, M.D.'s license?
NPPES lists California license number A110278, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine E. Tierney, M.D. prescribe under Medicare Part D?
In 2024, Katherine E. Tierney, M.D. had 38 Medicare Part D claims for 27 beneficiaries; the average among gynecologic oncology physician prescribers was 195. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.