Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. John Michael Callahan, MD

Individual provider Pediatrics Physician · NPI 1851704480

Dr. John Michael Callahan, MD is a Pediatrics Physician in Dubuque, Iowa. Licensed in Iowa. Registered with an NPI since 2014.

Licensed in
IA
In the registry since
2014
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1000 Langworthy St
Dubuque, IA 52001-7313
Phone: (563) 584-3440
Fax: (563) 584-3009
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pediatrics Physician (primary) Taxonomy 208000000X · Licence MD-44274 (IA)

Record details

NPI number1851704480
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 11, 2014
Last updated in NPPESJuly 5, 2017
Mailing address1500 Associates Dr., Dubuque, IA 52002-2201

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