John William Loewen, M.D
Emergency Medicine Physician · Sun City, AZ
John William Loewen, M.D is an emergency medicine physician with a practice address in Sun City, Arizona, and NPI 1760435960, issued on May 18, 2006. Check the license (Arizona 33798, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- John William Loewen
- Credential
- M.D
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 33798 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 10401 West Thunderbird Boulevard, Sun City, AZ 85351
- Phone
- (623) 977-7211
- Enumerated
- May 18, 2006
- Record last updated
- Feb 1, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 114566 AZ
- Medicare enrollment
- Enrolled (PECOS I20160624000750); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,494 in Arizona → Look up another NPI →
Also registered at 10401 West Thunderbird Boulevard
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kenneth Moore, M.DEmergency Medicine Physician1467402800
- Robert Plass, M.DEmergency Medicine Physician1437109865
- Michael Prebil, P.APhysician Assistant1104875533
- Thomas Umemoto, M.DEmergency Medicine Physician1477503845
Verify John William Loewen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 33798Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% more Medicare Part D claims than the average emergency medicine physician in 2024
346 Medicare Part D claims for 231 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 65 claims were for opioids.
Most prescribed
- Cephalexin31 claims
- Tramadol Hcl31 claims
- Ondansetron Odt28 claims
- Hydrocodone-Acetaminophen27 claims
- Azithromycin26 claims
- Prednisone18 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
- San Francisco Emergency Medical AssociatesLakeport, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John William Loewen among 1,494 emergency medicine physician records in Arizona
John William Loewen, M.D is one of 1,494 emergency medicine physician records with a practice address in Arizona. 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 62% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2003 · median 2014 among the 828 with a school on file
- Record last updated2008 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
22 emergency medicine physician records list a practice address in Sun City
They are 22 of the 813 NPPES records with a practice address in Sun City, and 1,494 emergency medicine physician records in Arizona.
All 1,494 in Arizona → Every provider in Sun City → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Robert Fitzgerald, M.DSun City, AZ 853511790735751
- Howard Friedman, M.DSun City, AZ 853511942259700
- Gregory Greenbaum, M.DSun City, AZ 853511982654067
- Joel Gross, M.DSun City, AZ 853511790735876
- Raymond Hemmert, D.OSun City, AZ 853511013946870
- Heidi Holland, D.OSun City, AZ 853511134179179
- Peter Hull, M.DSun City, AZ 853511255384640
- Ellen Leng, M.DSun City, AZ 853511902855497
Common questions
What is John William Loewen, M.D's NPI number?
John William Loewen, M.D's National Provider Identifier (NPI) is 1760435960, issued on May 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John William Loewen, M.D located?
The NPPES record lists a practice address at 10401 West Thunderbird Boulevard, Sun City, AZ, 85351. Phone: (623) 977-7211. Providers update this record themselves, so call before visiting.
How can I verify John William Loewen, M.D's license?
NPPES lists Arizona license number 33798, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John William Loewen, M.D prescribe under Medicare Part D?
In 2024, John William Loewen, M.D had 346 Medicare Part D claims for 231 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.