NPPES file of Aug 9, 2026

William C. Ludt, DO

Internal Medicine Physician · Tucson, AZ

William C. Ludt, DO is an internal medicine physician with a practice address in Tucson, Arizona, and NPI 1922084094, issued on Dec 20, 2005. Check the license (Arizona 1527, 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
1922084094
Name
William C. Ludt
Credential
DO
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
1527 AZ
Self-reported in NPPES; status is on the state search
Practice location
4892 N Stone Ave, Tucson, AZ 85704
Phone
(520) 396-1360
Enumerated
Dec 20, 2005
Record last updated
Jul 22, 2011 (not updated in 15 years: call before relying on the address or phone)
Fax
(520) 795-9043
Medicaid ID
224957 AZ
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 internal medicine physician records → All 2,853 in Arizona → Look up another NPI →

Also registered at 4892 N Stone Ave

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

  1. Scott Biehler, D.O.Internal Medicine Physician1518940089
  2. William Inboden, D.O.Family Medicine Physician1528043395
  3. Thomas Lampros, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1871691832
  4. Mary Ruehl, NPAcute Care Nurse Practitioner1275511503
  5. T Struse, DONuclear Cardiology Physician1295713543

Verify William C. Ludt in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersArizona Medical Board
    Search for license 1527    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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William C. Ludt among 2,853 internal medicine physician records in Arizona

William C. Ludt, DO 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 not. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 87% newer
  • In a Medicare fileNo · 75% of these records are
  • In the CMS Doctors and Clinicians fileNo · 58% of these records are
  • Record last updated2011 · 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. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 2,853 in Arizona → Every provider in Tucson → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Homeira Baghdadi, MDTucson, AZ 857041215908397
  2. Scott Biehler, D.O.Tucson, AZ 857041518940089
  3. Michael Boren, MDTucson, AZ 857041962473041
  4. Randall Brown, M.D.Tucson, AZ 857041881681393
  5. John Graham, MDTucson, AZ 857041336137538
  6. Bill Holloman, MDTucson, AZ 857041356307771
  7. Paul Koss, MDTucson, AZ 857041194701029
  8. Leonardo Mendoza, MDTucson, AZ 857041194798496

Common questions

What is William C. Ludt, DO's NPI number?

William C. Ludt, DO's National Provider Identifier (NPI) is 1922084094, issued on Dec 20, 2005. An NPI identifies a provider in billing; it is not a license.

Where is William C. Ludt, DO located?

The NPPES record lists a practice address at 4892 N Stone Ave, Tucson, AZ, 85704. Phone: (520) 396-1360. Providers update this record themselves, so call before visiting.

How can I verify William C. Ludt, DO's license?

NPPES lists Arizona license number 1527, 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.