Cassidy Bennett Sullivan, M.D.
Obstetrics & Gynecology Physician · Long Beach, CA
Cassidy Bennett Sullivan, M.D. is an obstetrics & gynecology physician with a practice address in Long Beach, California, and NPI 1821483900, issued on Apr 5, 2015. Check the license (California A163333, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cassidy Bennett Sullivan
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A163333 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
- Apr 5, 2015
- Record last updated
- Aug 15, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200415002533); accepts Medicare assignment
- 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
- Mary Louise Kiernan, MDObstetrics & Gynecology Physician1104289065
- Mailinh Vu, M.D.Obstetrics & Gynecology Physician1750793717
- Helen YangObstetrics & Gynecology Physician1255629440
Verify Cassidy Bennett Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A163333Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
35 Medicare Part D claims for 17 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
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: $490.69
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).
Cassidy Bennett Sullivan among 5,088 obstetrics & gynecology physician records in California
Cassidy Bennett Sullivan, M.D. 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 2015, is newer than 83% of them.
- NPI issued2015 · 83% of these records are older, 15% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2015 · median 2004 among the 2,700 with a school on file
- Record last updated2019 · 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
- Mary Louise Kiernan, MDLong Beach, CA 908071104289065
- Jacqueline King, MDLong Beach, CA 908071518360122
- Yahaira PlataLong Beach, CA 908071699137117
- Amanda Sheridan, MDLong Beach, CA 908071710372420
- Essam Taymour, M.D.Long Beach, CA 908071306985445
Common questions
What is Cassidy Bennett Sullivan, M.D.'s NPI number?
Cassidy Bennett Sullivan, M.D.'s National Provider Identifier (NPI) is 1821483900, issued on Apr 5, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Cassidy Bennett Sullivan, M.D. 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 Cassidy Bennett Sullivan, M.D.'s license?
NPPES lists California license number A163333, 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 Cassidy Bennett Sullivan, M.D. prescribe under Medicare Part D?
In 2024, Cassidy Bennett Sullivan, M.D. had 35 Medicare Part D claims for 17 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
What is Cassidy Bennett Sullivan, M.D.'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.