Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

MARY MADISON CALLAHAN DUPONT DO
NPI 1306692074
Student in an Organized Health Care Education/Training Program in Billings, MT

Q: What is Mary Callahan Dupont's NPI number?

The NPI number for Mary Callahan Dupont is 1306692074. It was assigned to this individual provider in the NPPES registry on April 24, 2024. The provider is also known as Mary Madison Callahan Do.

Q: What is Mary Callahan Dupont's specialty?

The primary specialty registered for this NPI is Student in an Organized Health Care Education/Training Program with taxonomy code 390200000X.

Active since April 24, 2024PECOS Enrolled

123 S 27TH ST, BILLINGS, MT 59101(406) 247-3350(406) 247-3389 Get Directions Write a Review

NPPES record last updated: July 20, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Jul 20, 2026, Dec 23, 2024, Dec 9, 2024 and 1 more (4 updates tracked since 2024).

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About Mary Madison Callahan Dupont Do NPPES

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

MARY MADISON CALLAHAN DUPONT DO (NPI 1306692074) is an individual student in an organized health care education/training program in Billings, Montana, licensed in Montana (143159) and active in the NPI registry since April 2024. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1306692074

Entity TypeIndividualFemale

Primary Taxonomy390200000X

Provider Legal NameMARY MADISON CALLAHAN DUPONTCredential: DO

Location Address123 S 27TH STBillings, MT 59101-4227

Mailing Address123 S 27th StBillings, MT 59101-4227 · (406) 247-3350 · Fax (406) 247-3389

Phone(406) 247-3350

Fax(406) 247-3389

Sole ProprietorYes

Enumeration DateApril 24, 2024

Last NPPES UpdateJuly 20, 20264 updates tracked since enumeration

NPPES CertifiedJuly 20, 2026

✔ NPI 1306692074 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyStudent in an Organized Health Care Education/Training ProgramStudent, Health Care

Taxonomy Code390200000X

License✔ Licensed in MT · 143159

Definition

An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.

123 S 27TH ST, Billings, MT 59101

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Other Names 1

Former Name (1)Mary Madison Callahan Do

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mary Madison Callahan Dupont Do 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.

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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KARMEN HAMMERMEISTER RN

Registered Nurse