1. Home
  2. Directory
  3. Missouri
  4. Saint Louis
  5. Internal Medicine
  6. NPI Profile

DR. ROBERT M MCMAHON MD
NPI 1043309792
Internal Medicine - Gastroenterology in Saint Louis, MO

Active since October 12, 2006PECOS Enrolled
509 BEAUFORD DR, SAINT LOUIS, MO 63122(314) 492-4100(260) 212-1858 Get Directions Write a Review

NPPES record last updated: October 2, 2024. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Oct 2, 2024, Dec 9, 2022, Mar 17, 2018 (3 updates tracked since 2018).

About Dr. Robert M Mcmahon Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ROBERT M MCMAHON MD (NPI 1043309792) is an individual gastroenterology provider in Saint Louis, Missouri, licensed in Missouri (R3N95) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1043309792
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. ROBERT M MCMAHONCredential: MD
Location Address509 BEAUFORD DRSaint Louis, MO 63122-1413
Mailing Address509 Beauford DrSaint Louis, MO 63122-1413 · (314) 492-4100 · Fax (260) 212-1858
Phone(314) 492-4100
Fax(260) 212-1858
Sole ProprietorYes
Enumeration DateOctober 12, 2006
Last NPPES UpdateOctober 2, 20243 updates tracked since enumeration
NPPES CertifiedOctober 2, 2024
✔ NPI 1043309792 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in MO · R3N95
Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

509 BEAUFORD DR, Saint Louis, MO 63122
Open in Google Maps ↗

Other Identifiers 1

Medicaid209776418MO

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Robert M Mcmahon Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer– Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63122 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Robert Mcmahon's NPI number?

The NPI number for Robert Mcmahon is 1043309792. It was assigned to this individual provider in the NPPES registry on October 12, 2006.

Where is Robert Mcmahon located?

Robert Mcmahon practices at 509 Beauford Dr, Saint Louis, MO 63122. The listed phone number is (314) 492-4100.

What is Robert Mcmahon's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Robert Mcmahon enrolled in Medicare?

Yes. Robert Mcmahon is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Robert Mcmahon was last updated on October 2, 2024. NPI Profile syncs with the weekly NPPES data releases published by CMS.