Dr. Colin J. McMahon, MD
- Medicare services, 2024
- 487
- Medicare patients, 2024
- 261
- Part D claims, 2024
- 494
- Publications
- 155
- Hospital affiliations
- 3
- Practice address
- 5300 Military Road, Lewiston, NY 14092
- Practice phone
- Call (716) 297-4800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. McMahon'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. Colin J. McMahon is an internist in Lewiston, New York
Dr. McMahon practices at Mount St. Mary's Hospital in Lewiston, New York, part of Catholic Health System.
Dr. McMahon's NPI, 1427015650, was assigned on May 1, 2006. Dr. McMahon graduated from University at Buffalo School of Medicine in 1990. Dr. McMahon holds New York license 186388.
- NPI
- 1427015650NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1658264387
- NPI enumeration date
- May 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (716) 297-4800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Colin J. McMahon practices at Mount St. Mary's Hospital in Lewiston, New York
Dr. McMahon's primary practice is Mount St. Mary's Hospital, at 5300 Military Road, Lewiston, NY 14092 in Niagara County. The practice phone is (716) 297-4800.
- Mount St. Mary's Hospital5300 Military Road, Lewiston, NY 14092 · Niagara CountyPhone(716) 297-4800
Source: Dmand AI Affiliation Data
Dr. Colin J. McMahon is affiliated with 4 sites of care and 3 medical groups
Dr. McMahon's primary practice is Mount St. Mary's Hospital in Lewiston, New York, part of Catholic Health System. Dr. McMahon is also affiliated with Mercy Hospital of Buffalo. The medical group on file is Buffalo Niagara Hospitalists. Dmand AI also links Dr. McMahon to 1 more hospital, 2 medical groups and 1 group practice or clinic, 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. Colin J. McMahon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. McMahon practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mount St. Mary's Hospital | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Colin J. McMahon is one of 9,643 internists in New York
Internal medicine is Dr. McMahon's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. McMahon is licensed in New York.
Specialties and state licenses
- Internal medicine, New YorkPrimary
Internists near Dr. McMahon
Counts of internists 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. Colin J. McMahon billed Medicare for 487 services in 2024
CMS data shows 487 Medicare services from Dr. McMahon across 7 procedure codes in 2024, for 261 Medicare patients. Medicare paid $43,636 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. McMahon's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5822024: 48716%
Dr. McMahon compared with the New York median for internists, 2024
- Dr. McMahon
- New York median
- Medicare services
- 487vs 42614% above
- Medicare patients
- 261vs 15865% above
- Part D claims
- 267vs 62257% below
Medians across 9,428 internists in New York with Dmand AI profiles that report each measure.
Dr. McMahon'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Colin J. McMahon treated 261 Medicare patients in 2024, average age 77
CMS counts 261 Medicare patients who saw Dr. McMahon in 2024. The largest group is 75 to 84, with 91 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 35% are also on Medicaid. Their average risk score is 2.13, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. McMahon's median patient age at 77, with 54% women.
Dr. McMahon's Medicare patients by age, 2024
Dr. McMahon's Medicare patients by sex, 2024
- Women15359%
- Men10841%
Chronic conditions among Dr. McMahon's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis57%
- Chronic kidney disease54%
- Ischemic heart disease54%
- Heart failure53%
- COPD51%
- Diabetes50%
Share of Medicare patients with each condition. A patient can have several.
Dr. McMahon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women54%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Colin J. McMahon wrote 494 Medicare Part D claims in 2024
In 2024, Dr. McMahon wrote 494 Medicare Part D claims for 217 patients. 85% of them were for generic drugs. CMS names the drug for 267 of them, across 10 drugs with 11 or more claims each, at $26,508 in total drug cost. In 2023, CMS named 161 claims across 8 drugs.
Dr. McMahon's Part D claims by kind of drug, 2024
- Generic419 claims85%
- Brand-name75 claims15%
Dr. McMahon'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. McMahon's Part D claims, 2024
- Opioids2%11 of 494 claims
- Antibiotics29%145 of 494 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: 1612024: 26766%
Drugs named by CMS: 10 in 2024, 8 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. Colin J. McMahon takes part in Medicare
Dr. McMahon accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Colin J. McMahon has 155 publications on record
Dmand AI links 155 papers to Dr. McMahon, published from 2007 to 2025. 2022 was the busiest year, with 19. The most frequent topics are Heart Defects, Congenital, Cardiology and Echocardiography. Dr. McMahon has published most often in Cardiol Young. Dr. McMahon's most frequent co-authors are Kevin F. Walsh, MD, Damien P. Kenny, MD and Daniel James Penny, MD.
Dr. McMahon's papers by year, 2016 to 2025
Topics Dr. McMahon writes about most
- Heart Defects, Congenital
- Cardiology
- Echocardiography
- Cardiac Catheterization
- Heart Ventricles
- Pediatrics
- Cardiac Surgical Procedures
- Ireland
Dr. McMahon's most frequent co-authors
- Kevin F. Walsh, MD31 shared papers
- Damien P. Kenny, MD14 shared papers
- Daniel James Penny, MD7 shared papers
Recent publications by Dr. McMahon
Eur J Pediatr
See who Dr. McMahon researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. McMahon works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Colin J. McMahon received $1,684 in industry payments from 2017 to 2023
CMS Open Payments shows 12 general payments to Dr. McMahon from 4 drug and device companies from 2017 to 2023. Travel and lodging make up the largest share, 76% of the total. Medtronic Vascular, Inc. paid the most, $1,587.
General payments to Dr. McMahon by program year, 2017 to 2023
General payments to Dr. McMahon by kind, 2017 to 2023
- Travel and lodging$1,28576%
- Food and beverage$39924%
Companies that paid Dr. McMahon the most, 2017 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Colin J. McMahon graduated from University at Buffalo School of Medicine
Dr. McMahon graduated from University at Buffalo School of Medicine in 1990.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Colin J. McMahon'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Colin J. McMahon
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. Colin J. McMahon's NPI number?
Dr. Colin J. McMahon's NPI number is 1427015650. It was assigned on May 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Colin J. McMahon?
Dr. Colin J. McMahon is an internist in Lewiston, New York. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Colin J. McMahon practice?
Dr. McMahon practices at 5300 Military Road, Lewiston, NY 14092. Dr. McMahon's primary practice is Mount St. Mary's Hospital in Lewiston, New York, part of Catholic Health System. Dmand AI also links Dr. McMahon to 1 hospital, 2 medical groups and 1 group practice or clinic.
What is Dr. Colin J. McMahon's office phone number?
The practice phone on file for Dr. McMahon is (716) 297-4800.
What is Dr. Colin J. McMahon's medical license number?
Dr. McMahon holds New York license 186388.
Which hospitals is Dr. Colin J. McMahon affiliated with?
Dr. McMahon practices at Mount St. Mary's Hospital in Lewiston, New York. Dr. McMahon is also affiliated with Mercy Hospital of Buffalo. Dmand AI links Dr. McMahon to 1 more hospital.
What medical group is Dr. Colin J. McMahon part of?
Dr. McMahon is linked to Buffalo Niagara Hospitalists. Dmand AI links Dr. McMahon to 2 more medical groups.
Does Dr. Colin J. McMahon accept Medicare?
Yes. CMS data shows Dr. McMahon billed Medicare for 487 services in 2024, and Dr. McMahon accepts Medicare assignment.
How many Medicare patients does Dr. Colin J. McMahon see?
CMS counts 261 Medicare patients who saw Dr. McMahon in 2024, with an average age of 77.
What services does Dr. Colin J. McMahon bill to Medicare?
In 2024, Dr. McMahon's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99223) and hospital inpatient care (99239).
Show 6 more questionsShow fewer questions
Where did Dr. Colin J. McMahon go to medical school?
Dr. McMahon graduated from University at Buffalo School of Medicine in 1990.
What drugs does Dr. Colin J. McMahon prescribe most?
In 2024 Medicare Part D data, Dr. McMahon's most prescribed drugs by claims were Cefdinir, Prednisone and Jardiance.
Has Dr. Colin J. McMahon received payments from drug or device companies?
CMS Open Payments shows $1,684 in general payments to Dr. McMahon from 4 companies from 2017 to 2023. The largest total came from Medtronic Vascular, Inc.
How long has Dr. Colin J. McMahon been practicing?
Dr. McMahon graduated from medical school in 1990, 36 years ago.
Does Dr. Colin J. McMahon do research?
Dmand AI links 155 publications to Dr. McMahon, published from 2007 to 2025.
Who does Dr. Colin J. McMahon publish with?
Dr. McMahon's most frequent co-authors are Kevin F. Walsh, MD (31 shared papers), Damien P. Kenny, MD (14 shared papers) and Daniel James Penny, MD (7 shared papers).
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