NPPES file of Aug 9, 2026

Ronnie C. William, M.D.

Endocrinology, Diabetes & Metabolism Physician · Tucson, AZ

Ronnie C. William, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Tucson, Arizona, and NPI 1639319049, issued on Feb 25, 2009. Check the license (Arizona 42303, as entered in NPPES) on the Arizona Medical Board; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1639319049
Name
Ronnie C. William
Credential
M.D.
Primary taxonomy
Endocrinology, Diabetes & Metabolism Physician 207RE0101X
License numbers
42303 AZ
H3577 AZ
Self-reported in NPPES; status is on the state search
Practice location
3601 S 6TH Ave, Tucson, AZ 85723
Phone
(520) 792-1450
Enumerated
Feb 25, 2009
Record last updated
Mar 24, 2026
Fax
(520) 626-2582
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest endocrinology, diabetes & metabolism physician records → All 175 in Arizona → Look up another NPI →

Also registered at 3601 S 6TH Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Elizabeth Acree, LMSWSocial Worker1215651336
  2. Emily AdamsClinical Social Worker1932694429
  3. Marion Adams, N.P.Gerontology Nurse Practitioner1174633523
  4. Sulaiman AdejumobiSocial Worker1619743481
  5. Rebecca Adiutori Magnotto, RNCPsychiatric/Mental Health Registered Nurse1033221825
  6. Corinne Adkins, RRTRegistered Respiratory Therapist1427374602

Verify Ronnie C. William in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersArizona Medical Board
    Search for license 42303    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Arizona license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Ronnie C. William among 175 endocrinology, diabetes & metabolism physician records in Arizona

Ronnie C. William, M.D. is one of 175 endocrinology, diabetes & metabolism physician records with a practice address in Arizona. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2009, is newer than 56% of them.

  • NPI issued2009 · 56% of these records are older, 39% newer
  • In a Medicare fileNo · 80% of these records are
  • In the CMS Doctors and Clinicians fileNo · 61% of these records are
  • Record last updated2026 · 37% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Endocrinology, Diabetes & Metabolism Physician providers in Arizona

There are 175 endocrinology, diabetes & metabolism physician records in Arizona. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 175 in Arizona → Every provider in Tucson → Endocrinology, Diabetes & Metabolism Physician nationwide →

The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes

  1. Stephanie Giffin, DOTucson, AZ 857231528592359
  2. Stephen Thomson, MDTucson, AZ 857231316903891
  3. Janet Funk, MDTucson, AZ 857241881254688
  4. Merilyn Goldschmid, MDTucson, AZ 857241730152489
  5. David Johnson, MDTucson, AZ 857241437258852
  6. Dima Abu Afifeh, MDTucson, AZ 857191144924325
  7. Ronadip Banerjee, MD, PHDTucson, AZ 857191386831279
  8. Ramiro Cardenas Lara, MDTucson, AZ 857191750733481

Common questions

What is Ronnie C. William, M.D.'s NPI number?

Ronnie C. William, M.D.'s National Provider Identifier (NPI) is 1639319049, issued on Feb 25, 2009. An NPI identifies a provider in billing; it is not a license.

Where is Ronnie C. William, M.D. located?

The NPPES record lists a practice address at 3601 S 6TH Ave, Tucson, AZ, 85723. Phone: (520) 792-1450. Providers update this record themselves, so call before visiting.

How can I verify Ronnie C. William, M.D.'s license?

NPPES lists Arizona license number 42303, 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.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.