Joan M Mcmahon, MD - Medicare Internal Medicine in Lewistown, MT

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Joan M Mcmahon, MD is a medicare enrolled "Internal Medicine" physician in Lewistown, Montana. She went to Saint Louis University School Of Medicine and graduated in 1996 and has 28 years of diverse experience with area of expertise as Internal Medicine. She is a member of the group practice Wheatland Memorial Healthcare, Townsend Health Systems Inc and her current practice location is 408 Wendell Ave, Lewistown, Montana. You can reach out to her office (for appointments etc.) via phone at (406) 535-1502.

Joan M Mcmahon is licensed to practice in Montana (license number MED-PHYS-LIC-9666) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1467403345.

Contact Information

Joan M Mcmahon, MD
408 Wendell Ave,
Lewistown, MT 59457-2261
(406) 535-1502
Not Available

Map and Direction




Physician's Profile

Full NameJoan M Mcmahon
GenderFemale
SpecialityInternal Medicine
Experience28 Years
Location408 Wendell Ave, Lewistown, Montana
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Joan M Mcmahon attended and graduated from Saint Louis University School Of Medicine in 1996
  NPI Data:
  • NPI Number: 1467403345
  • Provider Enumeration Date: 05/15/2006
  • Last Update Date: 06/19/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 9537123229
  • Enrollment ID: I20041112000618

Medical Identifiers

Medical identifiers for Joan M Mcmahon such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1467403345NPI-NPPES
0029206MedicaidMT
810536408OtherMTTAX ID #

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
208M00000XHospitalist MED-PHYS-LIC-9666 (Montana)Secondary
207R00000XInternal Medicine MED-PHYS-LIC-9666 (Montana)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Central Montana Medical CenterLewistown, MTHospital
Wheatland Memorial HospitalHarlowton, MTHospital
Broadwater Health CenterTownsend, MTHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Wheatland Memorial Healthcare337545137012
Townsend Health Systems Inc721484581711

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Joan M Mcmahon allows following entities to bill medicare on her behalf.
Entity NameState Of Montana
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1356351183
PECOS PAC ID: 3870499676
Enrollment ID: O20031211000579
Entity NameTownsend Health Systems Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1447245857
PECOS PAC ID: 7214845817
Enrollment ID: O20031223000506
Entity NameWheatland Memorial Healthcare
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1235204538
PECOS PAC ID: 3375451370
Enrollment ID: O20040120000523
Entity NameCentral Montana Medical Facilities Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1497868814
PECOS PAC ID: 5395639793
Enrollment ID: O20040209000295
Entity NameTownsend Health Systems Inc
Entity TypePart A Provider - Critical Access Hospital
Entity IdentifiersNPI Number: 1447245857
PECOS PAC ID: 7214845817
Enrollment ID: O20061104000088
Entity NameBillings Clinic
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1326104845
PECOS PAC ID: 6002993516
Enrollment ID: O20080430000212
Entity NameCentral Montana Community Health Center, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1942450432
PECOS PAC ID: 3072674464
Enrollment ID: O20090204000538

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Joan M Mcmahon is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Joan M Mcmahon, MD
310 Wendell Ave, Att: Clinic Manager,
Lewistown, MT 59457-2267

Ph: (406) 535-1502		Joan M Mcmahon, MD
408 Wendell Ave,
Lewistown, MT 59457-2261

Ph: (406) 535-1502

Reviews and Comments


Internal Medicine Doctors in Lewistown, MT

Dale Hoekema, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 408 Wendell Ave, Lewistown, MT 59457
Phone: 406-535-1502    
Dr. Edward Donnall Thomas Jr., M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1898 Timberline Rd, Lewistown, MT 59457
Phone: 406-538-2661    
Dr. Richard N Taylor Jr., M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 310 Wendell Ave, Lewistown, MT 59457
Phone: 406-535-6254    Fax: 406-535-6237

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.