Gerald Mahon, M.D.
Geriatric Medicine (Internal Medicine) Physician · Saint Louis, MO
Gerald Mahon, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Saint Louis, Missouri, and NPI 1154302289, issued on Nov 7, 2005. Check the license (Missouri R4H74, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Gerald Mahon
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- R4H74 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1201 S Grand Blvd, Saint Louis, MO 63104
- Phone
- (314) 977-8462
- Enumerated
- Nov 7, 2005
- Record last updated
- Mar 12, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (314) 977-3370
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 75 in Missouri → Look up another NPI →
Also registered at 1201 S Grand Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gerald Mahon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license R4H74Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
360 Medicare Part D claims for 15 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate25 claims
- Atorvastatin Calcium24 claims
- Dilt-Xr18 claims
- Omeprazole16 claims
- Lisinopril15 claims
- Potassium Chloride15 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Gerald Mahon among 75 geriatric medicine (internal medicine) physician records in Missouri
Gerald Mahon, M.D. is one of 75 geriatric medicine (internal medicine) physician records with a practice address in Missouri. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 45% of these records are
- Record last updated2021 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Missouri
There are 75 geriatric medicine (internal medicine) physician records in Missouri.
All 75 in Missouri → Every provider in Saint Louis → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Nazem Bassil, M.D,Saint Louis, MO 631041235320045
- Ahmed El-Sabbagh, M.D.Saint Louis, MO 631041376917781
- Julie Gammack, MDSt Louis, MO 631041518975366
- Nour Ibrahim, MDSaint Louis, MO 631041336029032
- Lina Toledo-Franco, MDSaint Louis, MO 631041073763017
- William Banks, M.D.Saint Louis, MO 631061023062296
- Rajagopal Chadaga, MDSaint Louis, MO 631061760416598
- Rekha Devkota, M.DSaint Louis, MO 631061184826455
Common questions
What is Gerald Mahon, M.D.'s NPI number?
Gerald Mahon, M.D.'s National Provider Identifier (NPI) is 1154302289, issued on Nov 7, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Gerald Mahon, M.D. located?
The NPPES record lists a practice address at 1201 S Grand Blvd, Saint Louis, MO, 63104. Phone: (314) 977-8462. Providers update this record themselves, so call before visiting.
How can I verify Gerald Mahon, M.D.'s license?
NPPES lists Missouri license number R4H74, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gerald Mahon, M.D. prescribe under Medicare Part D?
In 2024, Gerald Mahon, M.D. had 360 Medicare Part D claims for 15 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.