J Am Med Dir Assoc
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Dr. Gerald M. Mahon, MD
NPI1154302289
- Medicare services, 2022
- 366
- Part D claims, 2024
- 360
- Publications
- 2
- Hospital affiliations
- 1
- Industry payments
- $11
- Practice address
- 1201 S Grand Blvd, Saint Louis, MO 63104
- Practice phone
- Call (314) 257-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mahon'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. Gerald M. Mahon is a geriatric medicine (internal medicine) physician in Saint Louis, Missouri
Dr. Mahon practices at SSM Health Saint Louis University Hospital in Saint Louis, Missouri, part of SSM Health Care.
Dr. Mahon's NPI, 1154302289, was assigned on November 7, 2005. Dr. Mahon graduated from University of Texas Southwestern Medical School at Dallas in 1983. Dr. Mahon holds Missouri license R4H74.
NPI and contact details
- NPI
- 1154302289NPI Registry (opens in a new tab)
- NPI enumeration date
- November 7, 2005
- NPI status
- Active
- Practice phone
- (314) 257-8000
- 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 Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gerald M. Mahon practices at 2 locations in Saint Louis, Missouri
Dr. Mahon's primary practice is SSM Health Saint Louis University Hospital, at 1201 S Grand Blvd, Saint Louis, MO 63104 in St. Louis City. The practice phone is (314) 257-8000. The NPI Registry lists Dr. Mahon's practice address as 10010 Kennerly Rd, Saint Louis, MO 63128.
- SSM Health Saint Louis University HospitalPrimary1201 S Grand Blvd, Saint Louis, MO 63104 · St. Louis CityPhone(314) 257-8000
- NPI Registry address10010 Kennerly Rd, Saint Louis, MO 63128 · Saint Louis CountyPhone(314) 977-8462
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Gerald M. Mahon is affiliated with 1 site of care and 1 medical group
Dr. Mahon's primary practice is SSM Health Saint Louis University Hospital in Saint Louis, Missouri, part of SSM Health Care. The medical group on file is SLUCare Physician Group.
Sources: Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gerald M. Mahon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mahon practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| SSM Health Saint Louis University Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gerald M. Mahon is one of 57 geriatric medicine (internal medicine) physicians in Missouri
Geriatric medicine is Dr. Mahon's primary specialty in the NPI Registry, under taxonomy code 207RG0300X. Dr. Mahon is licensed in Missouri.
Specialties and state licenses
- Geriatric medicine (internal medicine), MissouriPrimary
Geriatric medicine (internal medicine) physicians near Dr. Mahon
Counts of geriatric medicine (internal medicine) physicians with a Dmand AI profile, by place and practice. Each opens the list.
57geriatric medicine (internal medicine) physicians in Missouri26geriatric medicine (internal medicine) physicians in Saint Louis3geriatric medicine (internal medicine) physicians at SSM Health Saint Louis University Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gerald M. Mahon billed Medicare for 366 services in 2022
CMS data shows 366 Medicare services from Dr. Mahon across 12 procedure codes in 2022. Medicare paid $20,280 for them.
Medicare services, 2022366
Paid by Medicare$20,280
Procedure codes12
Dr. Mahon's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 9922022: 35165%
- Lab and pathology
- 2021: 212022: 1529%
- Tests and treatments
- 2021: 222022: 0100%
- Other services
- 2021: 382022: 0100%
Where Dr. Mahon's Medicare services took place, 2022
- In an office31085%
- In a facility5615%
Dr. Mahon compared with the Missouri median for geriatric medicine (internal medicine) physicians, 2022
- Dr. Mahon
- Missouri median
- Medicare services
- 366vs 48925% below
- Part D claims
- 268vs 41235% below
Medians across 61 geriatric medicine (internal medicine) physicians in Missouri with Dmand AI profiles that report each measure.
Dr. Mahon'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.
Need commercial claims for Dr. Mahon?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mahon and other geriatric medicine (internal medicine) physicians in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gerald M. Mahon's patients have a median age of 79
Across all payers, Dmand AI patient panel data puts Dr. Mahon's median patient age at 79, with 48% women.
Dr. Mahon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 79
Patient panel by sex, all payers
- Women48%
- Men52%
Source: Dmand AI Patient Panel Data
Dr. Gerald M. Mahon wrote 360 Medicare Part D claims in 2024
In 2024, Dr. Mahon wrote 360 Medicare Part D claims for 15 patients. 90% of them were for generic drugs. CMS names the drug for 268 of them, across 19 drugs with 11 or more claims each, at $16,511 in total drug cost. In 2023, CMS named 811 claims across 36 drugs.
Part D claims, 2024360
Drugs named by CMS19
Total drug cost$16,511
Part D patients15
Dr. Mahon's Part D claims by kind of drug, 2024
- Generic325 claims90%
- Brand-name and other35 claims10%
Dr. Mahon'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8112024: 26867%
Drugs named by CMS: 19 in 2024, 36 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
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Dr. Gerald M. Mahon has 2 publications on record
Dmand AI links 2 papers to Dr. Mahon in 2014. Dr. Mahon has published most often in J Am Med Dir Assoc. Dr. Mahon's most frequent co-author is John E. Morley, MD.
Papers2
Dr. Mahon's most frequent co-authors
Recent publications by Dr. Mahon
J Am Med Dir Assoc
CholesterolHydroxymethylglutaryl-CoA Reductase InhibitorsLongevity
See who Dr. Mahon researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Mahon works with, so you can find a warm path to the right geriatric medicine (internal medicine) physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gerald M. Mahon received $11 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Mahon from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Eli Lilly and Company paid the most, $11.
Companies that paid Dr. Mahon the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gerald M. Mahon graduated from University of Texas Southwestern Medical School at Dallas
Dr. Mahon graduated from University of Texas Southwestern Medical School at Dallas in 1983.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gerald M. Mahon'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 Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand 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 Data |
| 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) |
| 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. Gerald M. Mahon
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. Gerald M. Mahon's NPI number?
Dr. Gerald M. Mahon's NPI number is 1154302289. It was assigned on November 7, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gerald M. Mahon?
Dr. Gerald M. Mahon is a geriatric medicine (internal medicine) physician in Saint Louis, Missouri. The primary specialty in the NPI Registry is Geriatric Medicine (Internal Medicine) Physician (taxonomy code 207RG0300X).
Where does Dr. Gerald M. Mahon practice?
Dr. Mahon practices at 1201 S Grand Blvd, Saint Louis, MO 63104. Dr. Mahon also practices at 10010 Kennerly Rd, Saint Louis, MO 63128. Dr. Mahon's primary practice is SSM Health Saint Louis University Hospital in Saint Louis, Missouri, part of SSM Health Care.
What is Dr. Gerald M. Mahon's office phone number?
The practice phone on file for Dr. Mahon is (314) 257-8000.
What is Dr. Gerald M. Mahon's medical license number?
Dr. Mahon holds Missouri license R4H74.
Which hospitals is Dr. Gerald M. Mahon affiliated with?
Dr. Mahon practices at SSM Health Saint Louis University Hospital in Saint Louis, Missouri.
What medical group is Dr. Gerald M. Mahon part of?
Dr. Mahon is linked to SLUCare Physician Group.
Does Dr. Gerald M. Mahon accept Medicare?
Yes. CMS data shows Dr. Mahon billed Medicare for 366 services in 2022.
What services does Dr. Gerald M. Mahon bill to Medicare?
In 2022, Dr. Mahon's most billed Medicare services were nursing facility care (99309), office visit, established patient (99214) and office visit, established patient (99212).
Where did Dr. Gerald M. Mahon go to medical school?
Dr. Mahon graduated from University of Texas Southwestern Medical School at Dallas in 1983.
Show 5 more questionsShow fewer questions
What drugs does Dr. Gerald M. Mahon prescribe most?
In 2024 Medicare Part D data, Dr. Mahon's most prescribed drugs by claims were Amlodipine Besylate, Atorvastatin Calcium and Dilt-XR.
Has Dr. Gerald M. Mahon received payments from drug or device companies?
CMS Open Payments shows $11 in general payments to Dr. Mahon from 1 company from 2017 to 2017. The largest total came from Eli Lilly and Company.
How long has Dr. Gerald M. Mahon been practicing?
Dr. Mahon graduated from medical school in 1983, 43 years ago.
Does Dr. Gerald M. Mahon do research?
Dmand AI links 2 publications to Dr. Mahon.
Who does Dr. Gerald M. Mahon publish with?
Dr. Mahon's most frequent co-authors are John E. Morley, MD (1 shared paper).
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