Dr. Thomas C. Callahan, DO
- Medicare services, 2024
- 2,838
- Medicare patients, 2024
- 498
- Part D claims, 2024
- 12,142
- Hospital affiliations
- 1
- Industry payments
- $13,547
- Practice address
- 1240 E 100 S, Saint George, UT 84790
- Practice phone
- Call (435) 656-5323
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Callahan Clinic
Saint George, Utah
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. Thomas C. Callahan is a family medicine physician in Saint George, Utah
Dr. Callahan practices at Callahan Clinic in Saint George, Utah.
Dr. Callahan's NPI, 1164861027, was assigned on June 24, 2013. Dr. Callahan holds Arizona license R2288.
- NPI
- 1164861027NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9335449057
- NPI enumeration date
- June 24, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (435) 656-5323
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas C. Callahan practices at Callahan Clinic in Saint George, Utah
Dr. Callahan's primary practice is Callahan Clinic, at 1240 E 100 S, Saint George, UT 84790 in Washington County. The practice phone is (435) 656-5323.
- Callahan Clinic1240 E 100 S, Saint George, UT 84790 · Washington CountyPhone(435) 656-5323
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Thomas C. Callahan is affiliated with 7 sites of care and 1 medical group
Dr. Callahan's primary practice is Callahan Clinic in Saint George, Utah. Dr. Callahan is also affiliated with St. George Regional Hospital. The medical group on file is Callahan Clinic. Dmand AI also links Dr. Callahan to 3 more home health agencies, 1 group practice or clinic and 1 hospice, each 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. Thomas C. Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Callahan Clinic | Available with a free account |
| +6 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas C. Callahan is one of 1,294 family medicine physicians in Utah
Family medicine is Dr. Callahan's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Callahan is licensed in Arizona.
Specialties and state licenses
- Family medicine, ArizonaPrimary
Family medicine physicians near Dr. Callahan
Counts of family medicine physicians 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. Thomas C. Callahan billed Medicare for 2,838 services in 2024
CMS data shows 2,838 Medicare services from Dr. Callahan across 24 procedure codes in 2024, for 498 Medicare patients. Medicare paid $133,808 for them. Every service was in an office.
Dr. Callahan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,2472024: 1,3045%
- Other services
- 2023: 3372024: 46438%
- Surgery
- 2023: 3582024: 31512%
- Drugs given in the office
- 2023: 1932024: 24326%
- Tests and treatments
- 2023: 2422024: 21013%
- Lab and pathology
- 2023: 872024: 194123%
- Imaging
- 2023: 1402024: 10823%
Dr. Callahan compared with the Utah median for family medicine physicians, 2024
- Dr. Callahan
- Utah median
- Medicare services
- 2,838vs 3518.1 times
- Medicare patients
- 498vs 1333.7 times
- Part D claims
- 11,263vs 86213.1 times
Medians across 1,260 family medicine physicians in Utah with Dmand AI profiles that report each measure.
Dr. Callahan's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Callahan and other family medicine physicians in Utah.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas C. Callahan treated 498 Medicare patients in 2024, average age 75
CMS counts 498 Medicare patients who saw Dr. Callahan in 2024. The largest group is 65 to 74, with 239 patients. 67% of them have high blood pressure, and 63% have high cholesterol. 4% are also on Medicaid. Their average risk score is 0.95, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Callahan's median patient age at 71, with 48% women.
Dr. Callahan's Medicare patients by age, 2024
Dr. Callahan's Medicare patients by sex, 2024
- Women23447%
- Men26453%
Chronic conditions among Dr. Callahan's Medicare patients, 2024
- High blood pressure67%
- High cholesterol63%
- Arthritis39%
- Diabetes24%
- Ischemic heart disease21%
- Mood disorders21%
- Depression20%
- Chronic kidney disease17%
Share of Medicare patients with each condition. A patient can have several.
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 71
Patient panel by sex, all payers
- Women48%
- Men52%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas C. Callahan wrote 12,142 Medicare Part D claims in 2024
In 2024, Dr. Callahan wrote 12,142 Medicare Part D claims for 974 patients. 89% of them were for generic drugs. CMS names the drug for 11,263 of them, across 174 drugs with 11 or more claims each, at $922,216 in total drug cost. In 2023, CMS named 10,056 claims across 164 drugs.
Dr. Callahan's Part D claims by kind of drug, 2024
- Generic10,773 claims89%
- Brand-name1,325 claims11%
- Other44 claims0%
Dr. Callahan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Callahan's Part D claims, 2024
- Opioids2%184 of 12,142 claims
- Antibiotics4%434 of 12,142 claims
- Antipsychotics, patients 65 and over1%98 of 12,142 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 10,0562024: 11,26312%
Drugs named by CMS: 174 in 2024, 164 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Thomas C. Callahan takes part in Medicare
Dr. Callahan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Thomas C. Callahan received $13,547 in industry payments from 2016 to 2025
CMS Open Payments shows 725 general payments to Dr. Callahan from 52 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 77% of the total. Abbott Laboratories paid the most, $3,240.
General payments to Dr. Callahan by program year, 2016 to 2025
General payments to Dr. Callahan by kind, 2016 to 2025
- Food and beverage$10,49177%
- Travel and lodging$2,97422%
- Education$821%
Companies that paid Dr. Callahan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Thomas C. 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 services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (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. Thomas C. 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. Thomas C. Callahan's NPI number?
Dr. Thomas C. Callahan's NPI number is 1164861027. It was assigned on June 24, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas C. Callahan?
Dr. Thomas C. Callahan is a family medicine physician in Saint George, Utah. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Thomas C. Callahan practice?
Dr. Callahan practices at 1240 E 100 S, Saint George, UT 84790. Dr. Callahan's primary practice is Callahan Clinic in Saint George, Utah. Dmand AI also links Dr. Callahan to 3 home health agencies, 1 group practice or clinic and 1 hospice.
What is Dr. Thomas C. Callahan's office phone number?
The practice phone on file for Dr. Callahan is (435) 656-5323.
What is Dr. Thomas C. Callahan's medical license number?
Dr. Callahan holds Arizona license R2288.
Which hospitals is Dr. Thomas C. Callahan affiliated with?
Dr. Callahan is affiliated with St. George Regional Hospital.
What medical group is Dr. Thomas C. Callahan part of?
Dr. Callahan is linked to Callahan Clinic.
Does Dr. Thomas C. Callahan accept Medicare?
Yes. CMS data shows Dr. Callahan billed Medicare for 2,838 services in 2024, and Dr. Callahan accepts Medicare assignment.
How many Medicare patients does Dr. Thomas C. Callahan see?
CMS counts 498 Medicare patients who saw Dr. Callahan in 2024, with an average age of 75.
What services does Dr. Thomas C. Callahan bill to Medicare?
In 2024, Dr. Callahan's most billed Medicare services were office visit, established patient (99213), surgery: heart and blood vessels (36415) and care management and other visits (99497).
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What drugs does Dr. Thomas C. Callahan prescribe most?
In 2024 Medicare Part D data, Dr. Callahan's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Lisinopril.
Has Dr. Thomas C. Callahan received payments from drug or device companies?
CMS Open Payments shows $13,547 in general payments to Dr. Callahan from 52 companies from 2016 to 2025. The largest total came from Abbott Laboratories.
How long has Dr. Thomas C. Callahan been practicing?
Dr. Callahan graduated from medical school in 2013, 13 years ago.
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