Leah E. Grossman, MD
Internal Medicine Physician · Oxnard, CA
Leah E. Grossman, MD is an internal medicine physician with a practice address in Oxnard, California, and NPI 1710542824, issued on May 3, 2019. Check the license (California A178486, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Leah E. Grossman
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A178486 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1600 N Rose Ave, Oxnard, CA 93030
- Phone
- (805) 988-2505
- Enumerated
- May 3, 2019
- Record last updated
- Nov 24, 2025
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1600 N Rose Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Glen Abergel, M.D.Critical Care Medicine (Internal Medicine) Physician1093743924
- Waqas Aftab, M.D.Critical Care Medicine (Internal Medicine) Physician1043414220
- David Aguilar, M.D.Anesthesiology Physician1568484921
- Michelle AmparoRegistered Nurse1386593994
- Melissa Arbar, DOAnesthesiology Physician1063875136
- Sulaiman Barkho, MDInternal Medicine Physician1710417209
Verify Leah E. Grossman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A178486Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
256 Medicare Part D claims for 85 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium19 claims
- Amlodipine Besylate12 claims
- Metoprolol Succinate11 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: $122.85
1 payment: food and beverage; the largest payer was Cumberland Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Leah E. Grossman among 17,696 internal medicine physician records in California
Leah E. Grossman, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 86% of them.
- NPI issued2019 · 86% of these records are older, 11% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
44 internal medicine physician records list a practice address in Oxnard
They are 44 of the 3,211 NPPES records with a practice address in Oxnard, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oxnard → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Charles Avery, M.D.Oxnard, CA 930301891735486
- Richard Brand, MDOxnard, CA 930301770527608
- Dorothea Clayton, M.D.Oxnard, CA 930301053596395
- Romany Demian, M.D.Oxnard, CA 930301043232085
- Shiu Man Lee, M.D.Oxnard, CA 930301144397555
- Bernard McDermott, D.O.Oxnard, CA 930301821101841
- Myo Min, M.DOxnard, CA 930301407176670
- Robert Nguyen, MDOxnard, CA 930301780775718
Common questions
What is Leah E. Grossman, MD's NPI number?
Leah E. Grossman, MD's National Provider Identifier (NPI) is 1710542824, issued on May 3, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Leah E. Grossman, MD located?
The NPPES record lists a practice address at 1600 N Rose Ave, Oxnard, CA, 93030. Phone: (805) 988-2505. Providers update this record themselves, so call before visiting.
How can I verify Leah E. Grossman, MD's license?
NPPES lists California license number A178486, 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 Leah E. Grossman, MD prescribe under Medicare Part D?
In 2024, Leah E. Grossman, MD had 256 Medicare Part D claims for 85 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.