Usama Mahmood, MD
Radiation Oncology Physician · Fountain Valley, CA
Usama Mahmood, MD is a radiation oncology physician with a practice address in Fountain Valley, California, and NPI 1386848844, issued on Jun 11, 2007. Check the license on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Usama Mahmood
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- P035 TX
Self-reported in NPPES; status is on the state search - Practice location
- 18111 Brookhurst St # LL0300, Fountain Valley, CA 92708
- Phone
- (714) 962-7100
- Enumerated
- Jun 11, 2007
- Record last updated
- Dec 6, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (714) 963-7600
- Medicaid ID
- 301292401 TX
- Medicare enrollment
- Enrolled (PECOS I20161117000961); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2006
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Verify Usama Mahmood in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of CaliforniaCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% fewer Medicare Part D claims than the average radiation oncology physician in 2024
75 Medicare Part D claims for 40 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl25 claims
- Ciprofloxacin Hcl16 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: $720.19
3 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 3,275 providers of this specialty with any payment received $1,897.85 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.
One hospital affiliation
- Torrance Memorial Medical CenterTorrance, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Radiation Oncology Physician providers in California
There are 735 radiation oncology physician records in California.
Other radiation oncology physician records in California
- Christina Abel, NURSE PRACTITIONEROrange, CA1033638911
- Jonathan Abelson, M.D.Thousand Oaks, CA1730348053
- Roy Abendroth, MDSan Francisco, CA1811988421
- Sunil Advani, M.D.La Jolla, CA1669649844
- Faisal Ahmed, MDStanford, CA1427314855
- Eugene Ahn, MDSimi Valley, CA1912999533
- Matthew Allen, MDRedding, CA1235301714
- Zahora Ally, MDAntioch, CA1306839915
- Munther Alqaisi, M.D.San Bernardino, CA1356454300
- Alessandra Amadeo, MDTorrance, CA1225011034
Common questions
What is Usama Mahmood, MD's NPI number?
Usama Mahmood, MD's National Provider Identifier (NPI) is 1386848844, issued on Jun 11, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Usama Mahmood, MD located?
The NPPES record lists a practice address at 18111 Brookhurst St # LL0300, Fountain Valley, CA, 92708. Phone: (714) 962-7100. Providers update this record themselves, so call before visiting.
How can I verify Usama Mahmood, MD's license?
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 Usama Mahmood, MD prescribe under Medicare Part D?
In 2024, Usama Mahmood, MD had 75 Medicare Part D claims for 40 beneficiaries; the average among radiation oncology physician prescribers was 134. 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.