NPPES file of Aug 9, 2026

James Alton Williams, MD

Pediatric Hematology & Oncology Physician · Mesa, AZ

James Alton Williams, MD is a pediatric hematology & oncology physician with a practice address in Mesa, Arizona, and NPI 1316930837, issued on Aug 30, 2005. Check the license (Arizona 333911, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.

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

NPPES recordNPPES file of Aug 9, 2026
1316930837
Name
James Alton Williams
Credential
MD
Primary taxonomy
Pediatric Hematology & Oncology Physician 2080P0207X
License number
333911 AZ
Self-reported in NPPES; status is on the state search
Practice location
5131 E Southern Ave, Mesa, AZ 85206
Phone
(602) 546-0920
Enumerated
Aug 30, 2005
Record last updated
Sep 13, 2017 (not updated in 9 years: call before relying on the address or phone)
Fax
(602) 546-0276
Medicaid ID
905036 AZ
Medicare enrollment
Enrolled (PECOS I20050330000218); accepts Medicare assignment
Medical or professional school
Wayne State University School Of Medicine, 1993
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest pediatric hematology & oncology physician records → All 55 in Arizona → Look up another NPI →

Also registered at 5131 E Southern Ave

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

  1. Karl Baumgartner, MDPediatrics Physician1174522890
  2. Ginger Carlson, PHDClinical Psychologist1881722692
  3. Deidra Dexter-Hine, RDRegistered Dietitian1932531753
  4. Joseph Gassen, M.D.Pediatrics Physician1972586006
  5. Michael Haynes, D.O.Pediatrics Physician1023470457
  6. Kimberly JonesPediatric Nutrition Registered Dietitian1811452014

Verify James Alton Williams in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersArizona Medical Board
    Search for license 333911    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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One hospital affiliation

  1. Phoenix Children's HospitalPhoenix, AZ · Childrens

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).

James Alton Williams among 55 pediatric hematology & oncology physician records in Arizona

James Alton Williams, MD is one of 55 pediatric hematology & oncology physician records with a practice address in Arizona. 58% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 93% newer
  • In a Medicare fileYes · 58% of these records are
  • In the CMS Doctors and Clinicians fileYes · 33% of these records are
  • Graduated1993 · median 2009 among the 18 with a school on file
  • Record last updated2017 · 62% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0207X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Pediatric Hematology & Oncology Physician providers in Arizona

There are 55 pediatric hematology & oncology physician records in Arizona.

All 55 in Arizona → Every provider in Mesa → Pediatric Hematology & Oncology Physician nationwide →

The 8 pediatric hematology & oncology physician records with the nearest ZIP codes

  1. Sanjay Shah, MDMesa, AZ 852061740263474
  2. Esteban Abella, MDMesa, AZ 852021982697306
  3. Santosh Hanmod, M.D.Mesa, AZ 852021730337478
  4. Xiaxin Li, M.DMesa, AZ 852021881807022
  5. Naresh Reddy, MDMesa, AZ 852021073851150
  6. Joseph Torkildson, MDMesa, AZ 852021710944095
  7. Misty VillarMesa, AZ 852021831742618
  8. Amy Mabry, DNP, RN, CPNP-PCGlendale, AZ 853061861032773

Common questions

What is James Alton Williams, MD's NPI number?

James Alton Williams, MD's National Provider Identifier (NPI) is 1316930837, issued on Aug 30, 2005. An NPI identifies a provider in billing; it is not a license.

Where is James Alton Williams, MD located?

The NPPES record lists a practice address at 5131 E Southern Ave, Mesa, AZ, 85206. Phone: (602) 546-0920. Providers update this record themselves, so call before visiting.

How can I verify James Alton Williams, MD's license?

NPPES lists Arizona license number 333911, 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. Medicare files from data.cms.gov. 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.