Stephen J. Wrenn, MD
Diagnostic Radiology Physician · Oakland, CA
Stephen J. Wrenn, MD is a diagnostic radiology physician with a practice address in Oakland, California, and NPI 1144555194, issued on Oct 8, 2009. Check the license (California A110249, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen J. Wrenn
- Credential
- MD
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License number
- A110249 CA
Self-reported in NPPES; status is on the state search - Practice location
- 275 W Macarthur Blvd, Oakland, CA 94611
- Phone
- (510) 752-1000
- Enumerated
- Oct 8, 2009
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20141020000773); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 2008
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 4,500 in California → Look up another NPI →
Also registered at 275 W Macarthur Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Stephen J. Wrenn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A110249Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average diagnostic radiology physician in 2024
34 Medicare Part D claims for 22 beneficiaries, against an average of 51 among the 2,711 providers of this specialty who prescribed in Part D.
Most prescribed
- Clopidogrel14 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: $35.76
2 payments; by number, the most common kind was food and beverage; the largest payer was Boston Scientific Corporation. The 8,048 providers of this specialty with any payment received $2,488.38 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
- Permanente Medical Group IncOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen J. Wrenn among 4,500 diagnostic radiology physician records in California
Stephen J. Wrenn, MD is one of 4,500 diagnostic radiology 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 2009, is newer than 64% of them.
- NPI issued2009 · 64% of these records are older, 33% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2008 · median 2004 among the 3,130 with a school on file
- Record last updated2021 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in California
There are 4,500 diagnostic radiology physician records in California.
All 4,500 in California → Every provider in Oakland → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Irene Balcar, MDOakland, CA 946111811075690
- Samuel Baronofsky, MDOakland, CA 946111548348329
- Nora Canty, MDOakland, CA 946111033297809
- Marianna Caponigro, MDOakland, CA 946111255419040
- Maria Dais, MDOakland, CA 946111164441986
- Grace Fan, MDOakland, CA 946111982782769
- Derek Kubota, MDOakland, CA 946111265510051
- David Lim, MDOakland, CA 946111083792865
Common questions
What is Stephen J. Wrenn, MD's NPI number?
Stephen J. Wrenn, MD's National Provider Identifier (NPI) is 1144555194, issued on Oct 8, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Stephen J. Wrenn, MD located?
The NPPES record lists a practice address at 275 W Macarthur Blvd, Oakland, CA, 94611. Phone: (510) 752-1000. Providers update this record themselves, so call before visiting.
How can I verify Stephen J. Wrenn, MD's license?
NPPES lists California license number A110249, 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 Stephen J. Wrenn, MD prescribe under Medicare Part D?
In 2024, Stephen J. Wrenn, MD had 34 Medicare Part D claims for 22 beneficiaries; the average among diagnostic radiology physician prescribers was 51. 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.