Thomas Seiji Umemoto, M.D
Emergency Medicine Physician · Sun City, AZ
Thomas Seiji Umemoto, M.D is an emergency medicine physician with a practice address in Sun City, Arizona, and NPI 1477503845, issued on May 10, 2006. Check the license (Arizona 35259, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Thomas Seiji Umemoto
- Credential
- M.D
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- 35259 AZ
A86503 CA
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 10, 2006
- Record last updated
- Jan 5, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicaid ID
- 122377 AZ
- Medicare enrollment
- Enrolled (PECOS I20040823001488); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 1999
- 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.
- Howard Friedman, M.DEmergency Medicine Physician1942259700
- John Loewen, M.DEmergency Medicine Physician1760435960
- Kenneth Moore, M.DEmergency Medicine Physician1467402800
- Robert Plass, M.DEmergency Medicine Physician1437109865
- Michael Prebil, P.APhysician Assistant1104875533
Verify Thomas Seiji Umemoto in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 35259Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average emergency medicine physician in 2024
99 Medicare Part D claims for 66 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Cephalexin16 claims
- Olanzapine13 claims
- Ondansetron Odt12 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 94.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Cep America - CaliforniaGlendora, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas Seiji Umemoto among 1,494 emergency medicine physician records in Arizona
Thomas Seiji Umemoto, 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
- Graduated1999 · median 2014 among the 828 with a school on file
- Record last updated2016 · 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 Thomas Seiji Umemoto, M.D's NPI number?
Thomas Seiji Umemoto, M.D's National Provider Identifier (NPI) is 1477503845, issued on May 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Seiji Umemoto, 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 Thomas Seiji Umemoto, M.D's license?
NPPES lists Arizona license number 35259, 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 Thomas Seiji Umemoto, M.D prescribe under Medicare Part D?
In 2024, Thomas Seiji Umemoto, M.D had 99 Medicare Part D claims for 66 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Thomas Seiji Umemoto, M.D's MIPS final score?
The 2023 MIPS final score is 94.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.