NPPES file of Aug 9, 2026

Rex W. Rundquist, MD

Pediatrics Physician · Sioux City, IA

Rex W. Rundquist, MD is a pediatrics physician with a practice address in Sioux City, Iowa, and NPI 1881691392, issued on Jun 30, 2005. Check the license (Iowa 21617, as entered in NPPES) on the Iowa Board of Medicine; 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
1881691392
Name
Rex W. Rundquist
Credential
MD
Primary taxonomy
Pediatrics Physician 208000000X
License number
21617 IA
Self-reported in NPPES; status is on the state search
Practice location
1125 Pierce St, Sioux City, IA 51105
Phone
(712) 255-8901
Enumerated
Jun 30, 2005
Record last updated
Apr 27, 2017 (not updated in 9 years: call before relying on the address or phone)
Fax
(712) 255-9161
Medicaid ID
0070714 IA
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 pediatrics physician records → All 502 in Iowa → Look up another NPI →

Also registered at 1125 Pierce St

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

  1. Patrick Beck, MDPediatrics Physician1568469880
  2. Nadine Bergin, ARNPNurse Practitioner1760461123
  3. Janet Black, RNRegistered Nurse1093023376
  4. Nitya Brenner, MDPediatrics Physician1881691293
  5. Susan Caldwell, MDPediatrics Physician1841297355
  6. Pam Cassens, RNRegistered Nurse1467760744

Verify Rex W. Rundquist in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIowa Board of Medicine
    Search for license 21617    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 Iowa license search

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Rex W. Rundquist among 502 pediatrics physician records in Iowa

Rex W. Rundquist, MD is one of 502 pediatrics physician records with a practice address in Iowa. 25% 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, 82% newer
  • In a Medicare fileNo · 25% of these records are
  • In the CMS Doctors and Clinicians fileNo · 10% of these records are
  • Record last updated2017 · 54% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Pediatrics Physician providers in Iowa

There are 502 pediatrics physician records in Iowa. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 502 in Iowa → Every provider in Sioux City → Pediatrics Physician nationwide →

The 8 pediatrics physician records with the nearest ZIP codes

  1. Rahul Bajracharya, M.D.Sioux City, IA 511051649946252
  2. Patrick Beck, MDSioux City, IA 511051568469880
  3. Nitya Brenner, MDSioux City, IA 511051881691293
  4. Susan Caldwell, MDSioux City, IA 511051841297355
  5. Jeremy Granger, M.D.Sioux City, IA 511061033317870
  6. Sandra Granger, MDSioux City, IA 511061023277597
  7. Joe-Ann Lourens, MDSioux City, IA 511061952927394
  8. Ray Sturdevant, MDSioux City, IA 511041326045808

Common questions

What is Rex W. Rundquist, MD's NPI number?

Rex W. Rundquist, MD's National Provider Identifier (NPI) is 1881691392, issued on Jun 30, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Rex W. Rundquist, MD located?

The NPPES record lists a practice address at 1125 Pierce St, Sioux City, IA, 51105. Phone: (712) 255-8901. Providers update this record themselves, so call before visiting.

How can I verify Rex W. Rundquist, MD's license?

NPPES lists Iowa license number 21617, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. 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.