Robert Mcmahon, MD
NPI 1043309792 · Gastroenterology Physician · Saint Louis, MO
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Mcmahon, MD is a Gastroenterology Physician provider in Saint Louis, MO (NPI 1043309792).
Provider details
- NPI number
- 1043309792
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- R3N95 (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
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-12
- Last updated
- 2024-10-02
- Certified
- 2024-10-02
Frequently asked questions
- What is Robert Mcmahon's NPI number?
- Robert Mcmahon's National Provider Identifier (NPI) is 1043309792, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Mcmahon's specialty?
- Robert Mcmahon is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Mcmahon located?
- Robert Mcmahon's practice location on file with NPPES is 509 Beauford Dr, Saint Louis, MO 63122-1413.
- What is Robert Mcmahon's phone number?
- The practice phone number listed in the NPPES registry for Robert Mcmahon is (314) 492-4100.
- Does Robert Mcmahon accept Medicare?
- Robert Mcmahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Mcmahon's NPI active?
- Yes — Robert Mcmahon's NPI (1043309792) is active in the NPPES registry as of the last update on 2024-10-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.