Gerald Mahon, M.D.
NPI 1154302289 · Geriatric Medicine (Internal Medicine) Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Geriatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gerald Mahon, M.D. is a Geriatric Medicine (Internal Medicine) Physician provider in Saint Louis, MO (NPI 1154302289).
Provider details
- NPI number
- 1154302289
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- R4H74 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Amlodipine Besylate | 25 |
| Atorvastatin Calcium | 24 |
| Diltiazem Hclbrand: Dilt-Xr | 18 |
| Omeprazole | 16 |
| Tamsulosin Hcl | 15 |
| Potassium Chloride | 15 |
| Lisinopril | 15 |
| Buspirone Hcl | 13 |
| Linagliptinbrand: Tradjenta | 13 |
Practice location
Mailing address
Additional practice locations (1)
- 13303 Tesson Ferry RdSaint Louis, MO 63128-4062Phone: (314) 842-4744Fax: (314) 842-3835
Registry dates
- Enumerated
- 2005-11-07
- Last updated
- 2021-03-12
- Certified
- 2021-03-12
Frequently asked questions
- What is Gerald Mahon's NPI number?
- Gerald Mahon's National Provider Identifier (NPI) is 1154302289, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gerald Mahon's specialty?
- Gerald Mahon is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Gerald Mahon located?
- Gerald Mahon's practice location on file with NPPES is 1201 S Grand Blvd, Saint Louis, MO 63104-1016.
- What is Gerald Mahon's phone number?
- The practice phone number listed in the NPPES registry for Gerald Mahon is (314) 977-8462.
- Does Gerald Mahon accept Medicare?
- Gerald Mahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gerald Mahon's NPI active?
- Yes — Gerald Mahon's NPI (1154302289) is active in the NPPES registry as of the last update on 2021-03-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.