Dr. Neil G. McMahon, MD
- Medicare services, 2022
- 135
- Medicare patients, 2024
- 17
- Part D claims, 2018
- 41
- Hospital affiliations
- 1
- Industry payments
- $585
- Practice address
- 3421 West Ninth Street, Waterloo, IA 50702
- Practice phone
- Call (319) 272-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Neil G. McMahon is a general surgeon in Waterloo, Iowa
Dr. McMahon practices at MercyOne Waterloo Medical Center in Waterloo, Iowa, part of Trinity Health.
Dr. McMahon's NPI, 1124055926, was assigned on June 27, 2006. Dr. McMahon graduated from Ohio State University College of Medicine in 1985. Dr. McMahon holds Iowa license 29818.
- NPI
- 1124055926NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0547390361
- NPI enumeration date
- June 27, 2006
- NPI status
- Active
- Practice phone
- (319) 272-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Neil G. McMahon practices at MercyOne Waterloo Medical Center in Waterloo, Iowa
Dr. McMahon's primary practice is MercyOne Waterloo Medical Center, at 3421 West Ninth Street, Waterloo, IA 50702 in Black Hawk County. The practice phone is (319) 272-8000.
- MercyOne Waterloo Medical Center3421 West Ninth Street, Waterloo, IA 50702 · Black Hawk CountyPhone(319) 272-8000
Source: Dmand AI Affiliation Data
Dr. Neil G. McMahon is affiliated with 2 sites of care and 1 medical group
Dr. McMahon's primary practice is MercyOne Waterloo Medical Center in Waterloo, Iowa, part of Trinity Health. The medical group on file is MercyOne Waterloo OB/GYN. Dmand AI also links Dr. McMahon to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Neil G. McMahon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. McMahon practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MercyOne Waterloo Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Neil G. McMahon is one of 317 general surgeons in Iowa
Surgery is Dr. McMahon's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. McMahon is licensed in Iowa.
Specialties and state licenses
- Surgery, IowaPrimary
General surgeons near Dr. McMahon
Counts of general surgeons 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. Neil G. McMahon billed Medicare for 135 services in 2022
CMS data shows 135 Medicare services from Dr. McMahon across 3 procedure codes in 2022, all of them office visits, for 17 Medicare patients. Medicare paid $5,910 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. McMahon's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 572022: 135137%
Dr. McMahon compared with the Iowa median for general surgeons, 2022
- Dr. McMahon
- Iowa median
- Medicare services
- 135vs 16418% below
- Medicare patients
- 17vs 14688% below
- Part D claims
- 41vs 43Close to median
Medians across 332 general surgeons in Iowa with Dmand AI profiles that report each measure.
Dr. McMahon's most billed Medicare procedure codes, 2022
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. McMahon and other general surgeons in Iowa.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Neil G. McMahon treated 17 Medicare patients in 2024, average age 73
CMS counts 17 Medicare patients who saw Dr. McMahon in 2024. 75% of them have high blood pressure, and 71% have high cholesterol. Their average risk score is 1.43, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. McMahon's median patient age at 52, with 71% women.
Chronic conditions among Dr. McMahon's Medicare patients, 2024
- High blood pressure75%
- High cholesterol71%
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 52
Patient panel by sex, all payers
- Women71%
- Men29%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Neil G. McMahon wrote 41 Medicare Part D claims in 2018
In 2018, Dr. McMahon wrote 41 Medicare Part D claims. They cover 1 drug, with $168 in total drug cost. In 2017, CMS named 56 claims across 2 drugs.
Dr. McMahon's most prescribed drugs by claims, 2018
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2017 to 2018
- 2017
- 2018
- Claims for drugs CMS names
- 2017: 562018: 4127%
Drugs named by CMS: 1 in 2018, 2 in 2017.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Neil G. McMahon received $585 in industry payments from 2016 to 2022
CMS Open Payments shows 23 general payments to Dr. McMahon from 12 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 73% of the total. Intuitive Surgical, Inc. paid the most, $219.
General payments to Dr. McMahon by program year, 2016 to 2022
General payments to Dr. McMahon by kind, 2016 to 2022
- Food and beverage$42873%
- Travel and lodging$15827%
Companies that paid Dr. McMahon the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Neil G. McMahon graduated from Ohio State University College of Medicine
Dr. McMahon graduated from Ohio State University College of Medicine in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Neil G. 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) |
| 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. Neil G. 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. Neil G. McMahon's NPI number?
Dr. Neil G. McMahon's NPI number is 1124055926. It was assigned on June 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Neil G. McMahon?
Dr. Neil G. McMahon is a general surgeon in Waterloo, Iowa. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Neil G. McMahon practice?
Dr. McMahon practices at 3421 West Ninth Street, Waterloo, IA 50702. Dr. McMahon's primary practice is MercyOne Waterloo Medical Center in Waterloo, Iowa, part of Trinity Health. Dmand AI also links Dr. McMahon to 1 group practice or clinic.
What is Dr. Neil G. McMahon's office phone number?
The practice phone on file for Dr. McMahon is (319) 272-8000.
What is Dr. Neil G. McMahon's medical license number?
Dr. McMahon holds Iowa license 29818.
Which hospitals is Dr. Neil G. McMahon affiliated with?
Dr. McMahon practices at MercyOne Waterloo Medical Center in Waterloo, Iowa.
What medical group is Dr. Neil G. McMahon part of?
Dr. McMahon is linked to MercyOne Waterloo OB/GYN.
Does Dr. Neil G. McMahon accept Medicare?
Yes. CMS data shows Dr. McMahon billed Medicare for 135 services in 2022.
How many Medicare patients does Dr. Neil G. McMahon see?
CMS counts 17 Medicare patients who saw Dr. McMahon in 2024, with an average age of 73.
What services does Dr. Neil G. McMahon bill to Medicare?
In 2022, Dr. McMahon's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and office visit, new patient (99203).
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Where did Dr. Neil G. McMahon go to medical school?
Dr. McMahon graduated from Ohio State University College of Medicine in 1985.
What drugs does Dr. Neil G. McMahon prescribe most?
In 2018 Medicare Part D data, Dr. McMahon's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Neil G. McMahon received payments from drug or device companies?
CMS Open Payments shows $585 in general payments to Dr. McMahon from 12 companies from 2016 to 2022. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Neil G. McMahon been practicing?
Dr. McMahon graduated from medical school in 1985, 41 years ago.
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