Stephanie Ossowski
Hematology & Oncology Physician · San Diego, CA
Stephanie Ossowski is a hematology & oncology physician with a practice address in San Diego, California, and NPI 1417301482, issued on Apr 15, 2016. Check the license (California 150580, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephanie Ossowski
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 150580 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4647 Zion Ave, San Diego, CA 92120
- Phone
- (877) 236-0333
- Enumerated
- Apr 15, 2016
- Record last updated
- Jun 20, 2025
- Medicare enrollment
- Enrolled (PECOS I20221130002706); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 4647 Zion Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Samy Abdou, MDNeurological Surgery Physician1215085006
- Samvel Abelyan, PHARMDPharmacist1306629928
- Ali Aboutaleb, MDFamily Medicine Physician1821261405
- Patricia Achilly, CNMAdvanced Practice Midwife1932257847
- Linda Adams, PAPhysician Assistant1427174689
- Mette-Margrethe Adkisson, M.D.Emergency Medicine Physician1528288081
Verify Stephanie Ossowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 150580Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average hematology & oncology physician in 2024
1,885 Medicare Part D claims for 310 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. 83 claims were for opioids.
Most prescribed
- Anastrozole156 claims
- Dexamethasone146 claims
- Lenalidomide135 claims
- Acyclovir89 claims
- Brukinsa76 claims
- Gabapentin76 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephanie Ossowski among 1,583 hematology & oncology physician records in California
Stephanie Ossowski is one of 1,583 hematology & oncology physician records with a practice address in California. 83% 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 87% of them.
- NPI issued2016 · 87% of these records are older, 11% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2016 · median 2003 among the 1,124 with a school on file
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in San Diego → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Jenny Devitt, MDSan Diego, CA 921201134296098
- Scott Godfrey, DOSan Diego, CA 921201659464089
- Charles Kossman, M.D.San Diego, CA 921201184799892
- Steven Kossman, M.D.San Diego, CA 921201477628634
- Nina Liu, MDSan Diego, CA 921201801944756
- John Oval, MDSan Diego, CA 921201720136617
- Dean Peng, MDSan Diego, CA 921201235298811
- Nandita Raja, MDSan Diego, CA 921201114079571
Common questions
What is Stephanie Ossowski's NPI number?
Stephanie Ossowski's National Provider Identifier (NPI) is 1417301482, issued on Apr 15, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Stephanie Ossowski located?
The NPPES record lists a practice address at 4647 Zion Ave, San Diego, CA, 92120. Phone: (877) 236-0333. Providers update this record themselves, so call before visiting.
How can I verify Stephanie Ossowski's license?
NPPES lists California license number 150580, 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 Ossowski prescribe under Medicare Part D?
In 2024, Stephanie Ossowski had 1,885 Medicare Part D claims for 310 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.