Mary Louise Stepan Kiernan, MD
Obstetrics & Gynecology Physician · Long Beach, CA
Mary Louise Stepan Kiernan, MD is an obstetrics & gynecology physician with a practice address in Long Beach, California, and NPI 1104289065, issued on Mar 29, 2016. Check the license (California A170051, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mary Louise Stepan Kiernan
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A170051 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3711 Long Beach Blvd Ste 700, Long Beach, CA 90807
- Phone
- (562) 424-8422
- Enumerated
- Mar 29, 2016
- Record last updated
- Mar 4, 2022
- Fax
- (562) 424-8770
- Medicare enrollment
- Enrolled (PECOS I20201008000899); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 2016
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 3711 Long Beach Blvd Ste 700
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christine Feigal, M.D.Obstetrics & Gynecology Physician1992186670
- Kimberly Kasperek, P.A.Physician Assistant1679905822
- Cassidy Sullivan, M.D.Obstetrics & Gynecology Physician1821483900
- Mailinh Vu, M.D.Obstetrics & Gynecology Physician1750793717
- Helen YangObstetrics & Gynecology Physician1255629440
Verify Mary Louise Stepan Kiernan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A170051Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
99 Medicare Part D claims for 30 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 39% of claims.
Most prescribed
- Estradiol43 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $484.54
18 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. The 21,429 providers of this specialty with any payment received $1,030.61 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.
Bills Medicare through one group practice
- Memorialcare Medical FoundationLong Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Louise Stepan Kiernan among 5,088 obstetrics & gynecology physician records in California
Mary Louise Stepan Kiernan, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 85% of them.
- NPI issued2016 · 85% of these records are older, 13% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2016 · median 2004 among the 2,700 with a school on file
- Record last updated2022 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Long Beach → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Christine Feigal, M.D.Long Beach, CA 908071992186670
- Brenda Jacobs, M.D.Long Beach, CA 908071083682371
- Sacha Kang-Chou, M.D.Long Beach, CA 908071417138702
- Jacqueline King, MDLong Beach, CA 908071518360122
- Yahaira PlataLong Beach, CA 908071699137117
- Amanda Sheridan, MDLong Beach, CA 908071710372420
- Cassidy Sullivan, M.D.Long Beach, CA 908071821483900
- Essam Taymour, M.D.Long Beach, CA 908071306985445
Common questions
What is Mary Louise Stepan Kiernan, MD's NPI number?
Mary Louise Stepan Kiernan, MD's National Provider Identifier (NPI) is 1104289065, issued on Mar 29, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Mary Louise Stepan Kiernan, MD located?
The NPPES record lists a practice address at 3711 Long Beach Blvd Ste 700, Long Beach, CA, 90807. Phone: (562) 424-8422. Providers update this record themselves, so call before visiting.
How can I verify Mary Louise Stepan Kiernan, MD's license?
NPPES lists California license number A170051, 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 Mary Louise Stepan Kiernan, MD prescribe under Medicare Part D?
In 2024, Mary Louise Stepan Kiernan, MD had 99 Medicare Part D claims for 30 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
What is Mary Louise Stepan Kiernan, MD's MIPS final score?
The 2023 MIPS final score is 76.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.