Dr. Thomas Patrick Whelan, MD
- Medicare services, 2024
- 724
- Medicare patients, 2024
- 434
- Part D claims, 2024
- 1,067
- Hospital affiliations
- 1
- Industry payments
- $862
- Practice address
- 73 Sandpit Rd, Danbury, CT 06810
- Practice phone
- Call (203) 743-2400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Danbury Surgery Center
Danbury, Connecticut
Find Dr. Whelan'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 Patrick Whelan is a gastroenterologist in Danbury, Connecticut
Dr. Whelan practices at Danbury Surgery Center in Danbury, Connecticut.
Dr. Whelan's NPI, 1720043227, was assigned on April 18, 2006. Dr. Whelan graduated from University of Vermont College of Medicine in 1983. Dr. Whelan holds Connecticut license 029121.
- NPI
- 1720043227NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385768191
- NPI enumeration date
- April 18, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (203) 743-2400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas Patrick Whelan practices at Danbury Surgery Center in Danbury, Connecticut
Dr. Whelan's primary practice is Danbury Surgery Center, at 73 Sandpit Rd, Danbury, CT 06810 in Western Ct County. The practice phone is (203) 743-2400.
- Danbury Surgery Center73 Sandpit Rd, Danbury, CT 06810 · Western Ct CountyPhone(203) 743-2400
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Thomas Patrick Whelan is affiliated with 5 sites of care and 3 medical groups
Dr. Whelan's primary practice is Danbury Surgery Center in Danbury, Connecticut. Dr. Whelan is also affiliated with Northwell Danbury Hospital. The medical group on file is Danbury Medical Group. Dmand AI also links Dr. Whelan to 3 more group practices and clinics and 2 medical groups, 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 Patrick Whelan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Whelan practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Danbury Surgery Center | Available with a free account |
| +4 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas Patrick Whelan is one of 298 gastroenterologists in Connecticut
Gastroenterology is Dr. Whelan's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Whelan is licensed in Connecticut.
Specialties and state licenses
- Gastroenterology, ConnecticutPrimary
Gastroenterologists near Dr. Whelan
Counts of gastroenterologists 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 Patrick Whelan billed Medicare for 724 services in 2024
CMS data shows 724 Medicare services from Dr. Whelan across 10 procedure codes in 2024, for 434 Medicare patients. Medicare paid $89,709 for them.
Dr. Whelan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4482024: 35221%
- Surgery
- 2023: 3442024: 30511%
- Other services
- 2023: 782024: 6714%
Where Dr. Whelan's Medicare services took place, 2024
- In an office35249%
- In a facility37251%
Dr. Whelan compared with the Connecticut median for gastroenterologists, 2024
- Dr. Whelan
- Connecticut median
- Medicare services
- 724vs 3612.0 times
- Medicare patients
- 434vs 25372% above
- Part D claims
- 843vs 53857% above
Medians across 284 gastroenterologists in Connecticut with Dmand AI profiles that report each measure.
Dr. Whelan'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. Whelan and other gastroenterologists in Connecticut.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas Patrick Whelan treated 434 Medicare patients in 2024, average age 73
CMS counts 434 Medicare patients who saw Dr. Whelan in 2024. The largest group is 65 to 74, with 207 patients. 75% of them have high cholesterol, and 67% have high blood pressure. 16% are also on Medicaid. Their average risk score is 1.14, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Whelan's median patient age at 67, with 50% women.
Dr. Whelan's Medicare patients by age, 2024
Dr. Whelan's Medicare patients by sex, 2024
- Women22452%
- Men21048%
Chronic conditions among Dr. Whelan's Medicare patients, 2024
- High cholesterol75%
- High blood pressure67%
- Arthritis41%
- Anxiety28%
- Ischemic heart disease24%
- Mood disorders23%
- Diabetes21%
- Cancer19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Whelan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women50%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas Patrick Whelan wrote 1,067 Medicare Part D claims in 2024
In 2024, Dr. Whelan wrote 1,067 Medicare Part D claims for 355 patients. 84% of them were for generic drugs. CMS names the drug for 843 of them, across 24 drugs with 11 or more claims each, at $666,297 in total drug cost. In 2023, CMS named 683 claims across 18 drugs.
Dr. Whelan's Part D claims by kind of drug, 2024
- Generic901 claims84%
- Brand-name and other166 claims16%
Dr. Whelan'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. Whelan's Part D claims, 2024
- Antibiotics2%25 of 1,067 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: 6832024: 84323%
Drugs named by CMS: 24 in 2024, 18 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
Dr. Thomas Patrick Whelan ranks in the 83rd percentile for colonoscopy in Medicare
Dr. Whelan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Whelan as offering telehealth. CMS counts 117 procedures of colonoscopy by Dr. Whelan, more than 83% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Whelan ranks in Medicare procedure volume
- Colonoscopy
- 83rd percentile117 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 74th percentile89 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Thomas Patrick Whelan received $862 in industry payments from 2018 to 2025
CMS Open Payments shows 30 general payments to Dr. Whelan from 18 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 98% of the total. Abbvie Inc. paid the most, $275.
General payments to Dr. Whelan by program year, 2018 to 2025
General payments to Dr. Whelan by kind, 2018 to 2025
- Food and beverage$84698%
- Education$162%
Companies that paid Dr. Whelan the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Thomas Patrick Whelan graduated from University of Vermont College of Medicine
Dr. Whelan graduated from University of Vermont College of Medicine in 1983.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Thomas Patrick Whelan'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) |
| 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 Patrick Whelan
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 Patrick Whelan's NPI number?
Dr. Thomas Patrick Whelan's NPI number is 1720043227. It was assigned on April 18, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas Patrick Whelan?
Dr. Thomas Patrick Whelan is a gastroenterologist in Danbury, Connecticut. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Thomas Patrick Whelan practice?
Dr. Whelan practices at 73 Sandpit Rd, Danbury, CT 06810. Dr. Whelan's primary practice is Danbury Surgery Center in Danbury, Connecticut. Dmand AI also links Dr. Whelan to 3 group practices and clinics and 2 medical groups.
What is Dr. Thomas Patrick Whelan's office phone number?
The practice phone on file for Dr. Whelan is (203) 743-2400.
What is Dr. Thomas Patrick Whelan's medical license number?
Dr. Whelan holds Connecticut license 029121.
Which hospitals is Dr. Thomas Patrick Whelan affiliated with?
Dr. Whelan is affiliated with Northwell Danbury Hospital.
What medical group is Dr. Thomas Patrick Whelan part of?
Dr. Whelan is linked to Danbury Medical Group. Dmand AI links Dr. Whelan to 2 more medical groups.
Does Dr. Thomas Patrick Whelan accept Medicare?
Yes. CMS data shows Dr. Whelan billed Medicare for 724 services in 2024, and Dr. Whelan accepts Medicare assignment.
Does Dr. Thomas Patrick Whelan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Whelan as offering telehealth services.
How many Medicare patients does Dr. Thomas Patrick Whelan see?
CMS counts 434 Medicare patients who saw Dr. Whelan in 2024, with an average age of 73.
Show 5 more questionsShow fewer questions
What services does Dr. Thomas Patrick Whelan bill to Medicare?
In 2024, Dr. Whelan's most billed Medicare services were office visit, established patient (99214), surgery: digestive system (45385) and surgery: digestive system (43239).
Where did Dr. Thomas Patrick Whelan go to medical school?
Dr. Whelan graduated from University of Vermont College of Medicine in 1983.
What drugs does Dr. Thomas Patrick Whelan prescribe most?
In 2024 Medicare Part D data, Dr. Whelan's most prescribed drugs by claims were Omeprazole, Sod Sulf-Potass Sulf-Mag Sulf and Pantoprazole Sodium.
Has Dr. Thomas Patrick Whelan received payments from drug or device companies?
CMS Open Payments shows $862 in general payments to Dr. Whelan from 18 companies from 2018 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Thomas Patrick Whelan been practicing?
Dr. Whelan graduated from medical school in 1983, 43 years ago.
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