Stephanie Sebastiani Larson
Obstetrics & Gynecology Physician · Loma Linda, CA
Stephanie Sebastiani Larson is an obstetrics & gynecology physician with a practice address in Loma Linda, California, and NPI 1124657218, issued on Apr 2, 2020. Check the license (California A187488, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephanie Sebastiani Larson
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A187488 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11234 Anderson St, Loma Linda, CA 92354
- Phone
- (909) 651-5510
- Enumerated
- Apr 2, 2020
- Record last updated
- Sep 16, 2024
- Medicare enrollment
- Enrolled (PECOS I20240815003883); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 2020
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 11234 Anderson St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Carolyn AbbasiAnesthesiology Physician1811287311
- Marian Abdelmalek, DOInternal Medicine Physician1285218024
- Faiz Abdur-Rahman, MDStudent in an Organized Health Care Education/Training Program1144073768
- Marc Abou AssaliStudent in an Organized Health Care Education/Training Program1689317265
- Adina Achiriloaie, MDDiagnostic Neuroimaging (Radiology) Physician1992983282
- Ana Acosta, MDStudent in an Organized Health Care Education/Training Program1265179774
Verify Stephanie Sebastiani Larson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A187488Check 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
34 Medicare Part D claims for 21 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.
Industry payments in 2024: $34.58
2 payments; by number, the most common kind was food and beverage; the largest payer was Medical Device Business Services, 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 2 group practices
- County OF RiversideMoreno Valley, CA
- Faculty Physicians And Surgeons OF LlusmSan Bernardino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephanie Sebastiani Larson among 5,088 obstetrics & gynecology physician records in California
Stephanie Sebastiani Larson 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 2020, is newer than 94% of them.
- NPI issued2020 · 94% of these records are older, 4% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2020 · median 2004 among the 2,700 with a school on file
- Record last updated2024 · 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).
59 obstetrics & gynecology physician records list a practice address in Loma Linda
They are 59 of the 4,863 NPPES records with a practice address in Loma Linda, and 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Loma Linda → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Kevin Balli, M.D.Loma Linda, CA 923541083636260
- Barry Block, M.D.Loma Linda, CA 923541134141328
- Karen Gaio Hansberger, MDLoma Linda, CA 923541710083159
- Yvonne Gollin, M.D.Loma Linda, CA 923541790899300
- Jeffrey Hardesty, M.D.Loma Linda, CA 923541447364062
- Elaine Hart, M.D.Loma Linda, CA 923541396767588
- John Jacobson, M.D.Loma Linda, CA 923541467474650
- Kathleen Lau, M.D.Loma Linda, CA 923541164536702
Common questions
What is Stephanie Sebastiani Larson's NPI number?
Stephanie Sebastiani Larson's National Provider Identifier (NPI) is 1124657218, issued on Apr 2, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Stephanie Sebastiani Larson located?
The NPPES record lists a practice address at 11234 Anderson St, Loma Linda, CA, 92354. Phone: (909) 651-5510. Providers update this record themselves, so call before visiting.
How can I verify Stephanie Sebastiani Larson's license?
NPPES lists California license number A187488, 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 Stephanie Sebastiani Larson prescribe under Medicare Part D?
In 2024, Stephanie Sebastiani Larson had 34 Medicare Part D claims for 21 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.