Dr. Thomas Dee Callahan, MD
- Medicare services, 2024
- 2,210
- Medicare patients, 2024
- 331
- Part D claims, 2024
- 8,166
- Publications
- 76
- Clinical trials
- 1
- 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 Dee Callahan is a family medicine physician in Saint George, Utah
Dr. Callahan practices at Callahan Clinic in Saint George, Utah.
Dr. Callahan's NPI, 1043328123, was assigned on August 28, 2006. Dr. Callahan graduated from University of Utah School of Medicine in 1975. Dr. Callahan holds Utah license 159420-1205.
- NPI
- 1043328123NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032005467
- NPI enumeration date
- August 28, 2006
- 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
- 77
- Medical school graduation
- 1975
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas Dee 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 Dee Callahan is affiliated with 9 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 1 more hospital, 3 home health agencies, 1 group practice or clinic, 1 hospice and 1 skilled nursing facility, 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 Dee Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices, 8 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 |
| +8 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas Dee 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 Utah.
Specialties and state licenses
- Family medicine, UtahPrimary
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 Dee Callahan billed Medicare for 2,210 services in 2024
CMS data shows 2,210 Medicare services from Dr. Callahan across 23 procedure codes in 2024, for 331 Medicare patients. Medicare paid $87,830 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: 8012024: 8557%
- Other services
- 2023: 2632024: 48685%
- Tests and treatments
- 2023: 2422024: 2209%
- Drugs given in the office
- 2023: 2022024: 2135%
- Surgery
- 2023: 2732024: 20525%
- Lab and pathology
- 2023: 1132024: 13519%
- Imaging
- 2023: 1392024: 9631%
Dr. Callahan compared with the Utah median for family medicine physicians, 2024
- Dr. Callahan
- Utah median
- Medicare services
- 2,210vs 3516.3 times
- Medicare patients
- 331vs 1332.5 times
- Part D claims
- 7,510vs 8628.7 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 Dee Callahan treated 331 Medicare patients in 2024, average age 76
CMS counts 331 Medicare patients who saw Dr. Callahan in 2024. The largest group is 75 to 84, with 145 patients. 75% of them have high blood pressure, and 64% have high cholesterol. Their average risk score is 1.08, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Callahan's median patient age at 75, with 51% women.
Dr. Callahan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Callahan's Medicare patients by sex, 2024
- Women15848%
- Men17352%
Chronic conditions among Dr. Callahan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol64%
- Arthritis38%
- Diabetes34%
- Mood disorders23%
- Depression22%
- Chronic kidney disease20%
- Ischemic heart disease20%
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 75
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas Dee Callahan wrote 8,166 Medicare Part D claims in 2024
In 2024, Dr. Callahan wrote 8,166 Medicare Part D claims for 563 patients. 90% of them were for generic drugs. CMS names the drug for 7,510 of them, across 132 drugs with 11 or more claims each, at $471,288 in total drug cost. In 2023, CMS named 7,863 claims across 135 drugs.
Dr. Callahan's Part D claims by kind of drug, 2024
- Generic7,342 claims90%
- Brand-name789 claims10%
- Other35 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
- Opioids3%283 of 8,166 claims
- Antibiotics5%389 of 8,166 claims
- Antipsychotics, patients 65 and over0%26 of 8,166 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: 7,8632024: 7,5104%
Drugs named by CMS: 132 in 2024, 135 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 Dee 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 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 Dee Callahan has 76 publications on record
Dmand AI links 76 papers to Dr. Callahan, published from 2011 to 2025. 2024 was the busiest year, with 13. The most frequent topics are Catheter Ablation, Atrial Fibrillation and Pacemaker, Artificial. Dr. Callahan has published most often in Heart Rhythm. Dr. Callahan's most frequent co-authors are Oussama M. Wazni, MD, Mohamed Hani Kanj, MD and Walid I. Saliba, MD.
Dr. Callahan's papers by year, 2016 to 2025
Topics Dr. Callahan writes about most
- Catheter Ablation
- Atrial Fibrillation
- Pacemaker, Artificial
- Defibrillators, Implantable
- Heart Rate
- Device Removal
- Ohio
- Pulmonary Veins
Dr. Callahan's most frequent co-authors
- Oussama M. Wazni, MD53 shared papers
- Mohamed Hani Kanj, MD52 shared papers
- Walid I. Saliba, MD52 shared papers
Recent publications by Dr. Callahan
See who Dr. Callahan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Callahan works with, so you can find a warm path to the right family medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Thomas Dee Callahan has worked on 1 clinical trial
Dmand AI links Dr. Callahan to 1 clinical trial. Conditions studied include Atrial Fibrillation and Arrhythmias, Cardiac.
Conditions in Dr. Callahan's trials
- Atrial Fibrillation
- Arrhythmias, Cardiac
Investigators on the most trials with Dr. Callahan
- Johan David Aasbo, DO1 shared trial
- Anish Krupesh Amin, MD1 shared trial
- Steven J. Bailin, MD1 shared trial
Recent clinical trials with Dr. Callahan
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Thomas Dee Callahan received $7,277 in industry payments from 2016 to 2025
CMS Open Payments shows 542 general payments to Dr. Callahan from 54 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $785.
General payments to Dr. Callahan by program year, 2016 to 2025
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
Dr. Thomas Dee Callahan graduated from University of Utah School of Medicine
Dr. Callahan graduated from University of Utah School of Medicine in 1975.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Thomas Dee 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 Dee Callahan
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What is Dr. Thomas Dee Callahan's NPI number?
Dr. Thomas Dee Callahan's NPI number is 1043328123. It was assigned on August 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas Dee Callahan?
Dr. Thomas Dee 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 Dee 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 1 hospital, 3 home health agencies, 1 group practice or clinic, 1 hospice and 1 skilled nursing facility.
What is Dr. Thomas Dee Callahan's office phone number?
The practice phone on file for Dr. Callahan is (435) 656-5323.
What is Dr. Thomas Dee Callahan's medical license number?
Dr. Callahan holds Utah license 159420-1205.
Which hospitals is Dr. Thomas Dee Callahan affiliated with?
Dr. Callahan is affiliated with St. George Regional Hospital. Dmand AI links Dr. Callahan to 1 more hospital.
What medical group is Dr. Thomas Dee Callahan part of?
Dr. Callahan is linked to Callahan Clinic.
Does Dr. Thomas Dee Callahan accept Medicare?
Yes. CMS data shows Dr. Callahan billed Medicare for 2,210 services in 2024, and Dr. Callahan accepts Medicare assignment.
How many Medicare patients does Dr. Thomas Dee Callahan see?
CMS counts 331 Medicare patients who saw Dr. Callahan in 2024, with an average age of 76.
What services does Dr. Thomas Dee Callahan bill to Medicare?
In 2024, Dr. Callahan's most billed Medicare services were office visit, established patient (99213), medicare service (G2211) and surgery: heart and blood vessels (36415).
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Where did Dr. Thomas Dee Callahan go to medical school?
Dr. Callahan graduated from University of Utah School of Medicine in 1975.
What drugs does Dr. Thomas Dee Callahan prescribe most?
In 2024 Medicare Part D data, Dr. Callahan's most prescribed drugs by claims were Levothyroxine Sodium, Rosuvastatin Calcium and Omeprazole.
Has Dr. Thomas Dee Callahan received payments from drug or device companies?
CMS Open Payments shows $7,277 in general payments to Dr. Callahan from 54 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Thomas Dee Callahan been practicing?
Dr. Callahan graduated from medical school in 1975, 51 years ago.
Does Dr. Thomas Dee Callahan do research?
Dmand AI links 76 publications to Dr. Callahan, published from 2011 to 2025. Dr. Callahan has worked on 1 clinical trial.
Who does Dr. Thomas Dee Callahan publish with?
Dr. Callahan's most frequent co-authors are Oussama M. Wazni, MD (53 shared papers), Mohamed Hani Kanj, MD (52 shared papers) and Walid I. Saliba, MD (52 shared papers).
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