William Joseph Matloff
Internal Medicine Physician · Tucson, AZ
William Joseph Matloff is an internal medicine physician with a practice address in Tucson, Arizona, and NPI 1033963418, issued on Apr 12, 2024. Check the license (Arizona R80823, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Joseph Matloff
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- R80823 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 2800 E Ajo Way Ste 100, Tucson, AZ 85713
- Phone
- (520) 874-2778
- Enumerated
- Apr 12, 2024
- Record last updated
- Apr 13, 2024
- Fax
- (520) 874-3456
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 2800 E Ajo Way Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Joseph Matloff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license R80823Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
68 Medicare Part D claims for 33 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
William Joseph Matloff among 2,853 internal medicine physician records in Arizona
William Joseph Matloff is one of 2,853 internal medicine physician records with a practice address in Arizona. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2024, is newer than 93% of them.
- NPI issued2024 · 93% of these records are older, 5% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2024 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
651 internal medicine physician records list a practice address in Tucson
They are 651 of the 18,788 NPPES records with a practice address in Tucson, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Tucson → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Corbin Ballam, DOTucson, AZ 857131205282894
- Rishi Bhargava, M.DTucson, AZ 857131689014946
- Fernando Blumenkron, M.D.Tucson, AZ 857131588198899
- Chrystina Cook, MDTucson, AZ 857131629017462
- Aaron Fernandes, MDTucson, AZ 857131386088227
- Kady Goldlist, M.D.Tucson, AZ 857131235512146
- Muhammad Husnain, M.D.Tucson, AZ 857131477960227
- Pallavi Koppolu, MDTucson, AZ 857131952508301
Common questions
What is William Joseph Matloff's NPI number?
William Joseph Matloff's National Provider Identifier (NPI) is 1033963418, issued on Apr 12, 2024. An NPI identifies a provider in billing; it is not a license.
Where is William Joseph Matloff located?
The NPPES record lists a practice address at 2800 E Ajo Way Ste 100, Tucson, AZ, 85713. Phone: (520) 874-2778. Providers update this record themselves, so call before visiting.
How can I verify William Joseph Matloff's license?
NPPES lists Arizona license number R80823, 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 William Joseph Matloff prescribe under Medicare Part D?
In 2024, William Joseph Matloff had 68 Medicare Part D claims for 33 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.