Dr. John Michael Callahan, MD
- Part D claims, 2022
- 12
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2014
- Practice address
- 1000 Langworthy St, Dubuque, IA 52001
- Practice phone
- Call (563) 584-4100
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Medical Associates Clinic P C
Dubuque, Iowa
Find Dr. Callahan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Michael Callahan is a pediatrician in Dubuque, Iowa
Dr. Callahan practices at Medical Associates Clinic P C in Dubuque, Iowa.
Dr. Callahan's NPI, 1851704480, was assigned on June 11, 2014. Dr. Callahan holds Iowa license MD-44274.
- NPI
- 1851704480NPI Registry (opens in a new tab)
- NPI enumeration date
- June 11, 2014
- NPI status
- Active
- Practice phone
- (563) 584-4100
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. John Michael Callahan practices at Medical Associates Clinic P C in Dubuque, Iowa
Dr. Callahan's primary practice is Medical Associates Clinic P C, at 1000 Langworthy St, Dubuque, IA 52001 in Dubuque County. The practice phone is (563) 584-4100.
- Medical Associates Clinic P C1000 Langworthy St, Dubuque, IA 52001 · Dubuque CountyPhone(563) 584-4100
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John Michael Callahan is affiliated with 2 sites of care and 1 medical group
Dr. Callahan's primary practice is Medical Associates Clinic P C in Dubuque, Iowa. The medical group on file is Medical Associates Clinic. Dmand AI also links Dr. Callahan to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. John Michael Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Medical Associates Clinic P C | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Michael Callahan is one of 377 pediatricians in Iowa
Pediatrics is Dr. Callahan's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Callahan is licensed in Iowa.
Specialties and state licenses
- Pediatrics, IowaPrimary
Pediatricians near Dr. Callahan
Counts of pediatricians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Michael Callahan's patients have a median age of 7
Across all payers, Dmand AI patient panel data puts Dr. Callahan's median patient age at 7, with 40% women.
Dr. Callahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 7
Patient panel by sex, all payers
- Women40%
- Men60%
Source: Dmand AI Patient Panel Data
Dr. John Michael Callahan wrote 12 Medicare Part D claims in 2022
In 2022, Dr. Callahan wrote 12 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $4,397 in total drug cost.
Dr. Callahan's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Sources for Dr. John Michael Callahan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John Michael Callahan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John Michael Callahan's NPI number?
Dr. John Michael Callahan's NPI number is 1851704480. It was assigned on June 11, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. John Michael Callahan?
Dr. John Michael Callahan is a pediatrician in Dubuque, Iowa. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. John Michael Callahan practice?
Dr. Callahan practices at 1000 Langworthy St, Dubuque, IA 52001. Dr. Callahan's primary practice is Medical Associates Clinic P C in Dubuque, Iowa. Dmand AI also links Dr. Callahan to 1 group practice or clinic.
What is Dr. John Michael Callahan's office phone number?
The practice phone on file for Dr. Callahan is (563) 584-4100.
What is Dr. John Michael Callahan's medical license number?
Dr. Callahan holds Iowa license MD-44274.
What medical group is Dr. John Michael Callahan part of?
Dr. Callahan is linked to Medical Associates Clinic.
What drugs does Dr. John Michael Callahan prescribe most?
In 2022 Medicare Part D data, Dr. Callahan's most prescribed drugs by claims were Lubiprostone.
How long has Dr. John Michael Callahan been practicing?
Dr. Callahan graduated from medical school in 2014, 12 years ago.
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