John Michael Callahan, M.D.
Pediatrics Physician · Dubuque, IA
John Michael Callahan, M.D. is a pediatrics physician with a practice address in Dubuque, Iowa, and NPI 1851704480, issued on Jun 11, 2014. Check the license (Iowa MD-44274, as entered in NPPES) on the Iowa Board of Medicine; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Michael Callahan
- Credential
- M.D.
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- MD-44274 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1000 Langworthy St, Dubuque, IA 52001
- Phone
- (563) 584-3440
- Enumerated
- Jun 11, 2014
- Record last updated
- Jul 5, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (563) 584-3009
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 502 in Iowa → Look up another NPI →
Also registered at 1000 Langworthy St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kala Ave-Lallemant, FNPFamily Nurse Practitioner1235551656
- Martin Bagby, DOFamily Medicine Physician1942269402
Verify John Michael Callahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license MD-44274Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Michael Callahan among 502 pediatrics physician records in Iowa
John Michael Callahan, M.D. 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 2014, is newer than 61% of them.
- NPI issued2014 · 61% of these records are older, 37% 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).
17 pediatrics physician records list a practice address in Dubuque
They are 17 of the 1,468 NPPES records with a practice address in Dubuque, and 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 Dubuque → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Keevin Franzen, M.D.Dubuque, IA 520011689653701
- Ankura Kadakia, DODubuque, IA 520011235583956
- David Kemp, M.D.Dubuque, IA 520011992784540
- David Kragenbrink, MDDubuque, IA 520011154316800
- Shiny Kunjummen, MDDubuque, IA 520011346288073
- James Livermore, MDDubuque, IA 520011497846679
- Ronald McGillDubuque, IA 520011942289574
- Heather-Lynn Menezes, DODubuque, IA 520011336707991
Common questions
What is John Michael Callahan, M.D.'s NPI number?
John Michael Callahan, M.D.'s National Provider Identifier (NPI) is 1851704480, issued on Jun 11, 2014. An NPI identifies a provider in billing; it is not a license.
Where is John Michael Callahan, M.D. located?
The NPPES record lists a practice address at 1000 Langworthy St, Dubuque, IA, 52001. Phone: (563) 584-3440. Providers update this record themselves, so call before visiting.
How can I verify John Michael Callahan, M.D.'s license?
NPPES lists Iowa license number MD-44274, 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.
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.