Dr. Norman M. Callahan, DO
- Medicare services, 2024
- 5,789
- Medicare patients, 2024
- 713
- Part D claims, 2024
- 932
- Hospital affiliations
- 5
- Industry payments
- $11,952
- Practice address
- 325 West Central Avenue, Lower Level, Malvern, PA 19355
- Practice phone
- Call (610) 644-7274
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Main Line Endoscopy Center - Malvern
Surgery Center - Medicare-Certified · Malvern, Pennsylvania
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. Norman M. Callahan is a gastroenterologist in Malvern, Pennsylvania
Dr. Callahan practices at Main Line Endoscopy Center - Malvern in Malvern, Pennsylvania.
Dr. Callahan's NPI, 1851367783, was assigned on February 28, 2006. Dr. Callahan graduated from Philadelphia College of Osteopathic Medicine in 1991. Dr. Callahan holds Pennsylvania license OS007658-L.
- NPI
- 1851367783NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1355394289
- NPI enumeration date
- February 28, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (610) 644-7274
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 61
- Medical school graduation
- 1991
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Norman M. Callahan practices at Main Line Endoscopy Center - Malvern in Malvern, Pennsylvania
Dr. Callahan's primary practice is Main Line Endoscopy Center - Malvern, at 325 West Central Avenue, Lower Level, Malvern, PA 19355. The practice phone is (610) 644-7274.
- Main Line Endoscopy Center - Malvern325 West Central Avenue, Lower Level, Malvern, PA 19355Phone(610) 644-7274
Source: Dmand AI Affiliation Data
Dr. Norman M. Callahan is affiliated with 7 sites of care and 2 medical groups
Dr. Callahan's primary practice is Main Line Endoscopy Center - Malvern in Malvern, Pennsylvania. Dr. Callahan is also affiliated with Hospital of the University of Pennsylvania. The medical group on file is Regional Gastroenterology Associates of Lancaster (RGAL). Dmand AI also links Dr. Callahan to 4 more hospitals, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Norman M. Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Main Line Endoscopy Center - Malvern | Available with a free account |
| +6 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Norman M. Callahan is one of 899 gastroenterologists in Pennsylvania
Gastroenterology is Dr. Callahan's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Callahan is licensed in Pennsylvania.
Specialties and state licenses
- Gastroenterology, PennsylvaniaPrimary
Gastroenterologists near Dr. Callahan
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. Norman M. Callahan billed Medicare for 5,789 services in 2024
CMS data shows 5,789 Medicare services from Dr. Callahan across 18 procedure codes in 2024, for 713 Medicare patients. Medicare paid $194,263 for them.
Dr. Callahan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 5,7012024: 4,80016%
- Office and hospital visits
- 2023: 5722024: 47317%
- Surgery
- 2023: 4152024: 37111%
- Other services
- 2023: 1002024: 12929%
- Tests and treatments
- 2023: 622024: 1674%
Where Dr. Callahan's Medicare services took place, 2024
- In an office5,01587%
- In a facility77413%
Dr. Callahan compared with the Pennsylvania median for gastroenterologists, 2024
- Dr. Callahan
- Pennsylvania median
- Medicare services
- 5,789vs 40114.4 times
- Medicare patients
- 713vs 2942.4 times
- Part D claims
- 775vs 3752.1 times
Medians across 899 gastroenterologists in Pennsylvania 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.
Need commercial claims for Dr. Callahan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Callahan and other gastroenterologists in Pennsylvania.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Norman M. Callahan treated 713 Medicare patients in 2024, average age 75
CMS counts 713 Medicare patients who saw Dr. Callahan in 2024. The largest group is 65 to 74, with 358 patients. 75% of them have high cholesterol, and 70% have high blood pressure. 3% are also on Medicaid. Their average risk score is 1.32, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Callahan's median patient age at 65, with 48% women.
Dr. Callahan's Medicare patients by age, 2024
Dr. Callahan's Medicare patients by sex, 2024
- Women36852%
- Men34548%
Chronic conditions among Dr. Callahan's Medicare patients, 2024
- High cholesterol75%
- High blood pressure70%
- Arthritis47%
- Ischemic heart disease38%
- Anxiety28%
- Mood disorders26%
- Diabetes24%
- Atrial fibrillation23%
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 65
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Norman M. Callahan wrote 932 Medicare Part D claims in 2024
In 2024, Dr. Callahan wrote 932 Medicare Part D claims for 273 patients. 88% of them were for generic drugs. CMS names the drug for 775 of them, across 16 drugs with 11 or more claims each, at $1,074,050 in total drug cost. In 2023, CMS named 727 claims across 14 drugs.
Dr. Callahan's Part D claims by kind of drug, 2024
- Generic821 claims88%
- Brand-name111 claims12%
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
- Antibiotics3%27 of 932 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: 7272024: 7757%
Drugs named by CMS: 16 in 2024, 14 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. Norman M. Callahan ranks in the 96th percentile for colonoscopy in Medicare
Dr. Callahan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 249 procedures of colonoscopy by Dr. Callahan, more than 96% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Callahan ranks in Medicare procedure volume
- Colonoscopy
- 96th percentile249 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 85th percentile147 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)
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.
Dr. Norman M. Callahan received $11,952 in industry payments from 2016 to 2025
CMS Open Payments shows 697 general payments to Dr. Callahan from 42 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $3,578.
General payments to Dr. Callahan by program year, 2016 to 2025
General payments to Dr. Callahan by kind, 2016 to 2025
- Food and beverage$11,88699%
- Education$671%
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. Norman M. Callahan graduated from Philadelphia College of Osteopathic Medicine
Dr. Callahan graduated from Philadelphia College of Osteopathic Medicine in 1991.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Norman M. 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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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. Norman M. 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. Norman M. Callahan's NPI number?
Dr. Norman M. Callahan's NPI number is 1851367783. It was assigned on February 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Norman M. Callahan?
Dr. Norman M. Callahan is a gastroenterologist in Malvern, Pennsylvania. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Norman M. Callahan practice?
Dr. Callahan practices at 325 West Central Avenue, Lower Level, Malvern, PA 19355. Dr. Callahan's primary practice is Main Line Endoscopy Center - Malvern in Malvern, Pennsylvania. Dmand AI also links Dr. Callahan to 4 hospitals, 1 group practice or clinic and 1 medical group.
What is Dr. Norman M. Callahan's office phone number?
The practice phone on file for Dr. Callahan is (610) 644-7274.
What is Dr. Norman M. Callahan's medical license number?
Dr. Callahan holds Pennsylvania license OS007658-L.
Which hospitals is Dr. Norman M. Callahan affiliated with?
Dr. Callahan is affiliated with Hospital of the University of Pennsylvania. Dmand AI links Dr. Callahan to 4 more hospitals.
What medical group is Dr. Norman M. Callahan part of?
Dr. Callahan is linked to Regional Gastroenterology Associates of Lancaster (RGAL). Dmand AI links Dr. Callahan to 1 more medical group.
Does Dr. Norman M. Callahan accept Medicare?
Yes. CMS data shows Dr. Callahan billed Medicare for 5,789 services in 2024, and Dr. Callahan accepts Medicare assignment.
How many Medicare patients does Dr. Norman M. Callahan see?
CMS counts 713 Medicare patients who saw Dr. Callahan in 2024, with an average age of 75.
What services does Dr. Norman M. Callahan bill to Medicare?
In 2024, Dr. Callahan's most billed Medicare services were injected or infused drug (J3380), surgery: digestive system (45385) and office visit, established patient (99213).
Show 4 more questionsShow fewer questions
Where did Dr. Norman M. Callahan go to medical school?
Dr. Callahan graduated from Philadelphia College of Osteopathic Medicine in 1991.
What drugs does Dr. Norman M. Callahan prescribe most?
In 2024 Medicare Part D data, Dr. Callahan's most prescribed drugs by claims were Omeprazole, Pantoprazole Sodium and Famotidine.
Has Dr. Norman M. Callahan received payments from drug or device companies?
CMS Open Payments shows $11,952 in general payments to Dr. Callahan from 42 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Norman M. Callahan been practicing?
Dr. Callahan graduated from medical school in 1991, 35 years ago.
Selling to gastroenterology practices?
See gastroenterologists in Pennsylvania by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card