James A Mack, MD - Medicare Endocrinology in Billings, MT

James A Mack, MD is a medicare enrolled "Internal Medicine - Endocrinology, Diabetes & Metabolism" physician in Billings, Montana. He went to University Of Washington School Of Medicine and graduated in 1987 and has 37 years of diverse experience with area of expertise as Endocrinology. He is a member of the group practice Billings Clinic and his current practice location is 1045 N 30th St, Billings, Montana. You can reach out to his office (for appointments etc.) via phone at (406) 238-2500.

James A Mack is licensed to practice in Montana (license number 8739) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1669575445.

Contact Information

James A Mack, MD
1045 N 30th St,
Billings, MT 59101-0733
(406) 238-2500
Not Available



Physician's Profile

Full NameJames A Mack
GenderMale
SpecialityEndocrinology
Experience37 Years
Location1045 N 30th St, Billings, Montana
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • James A Mack attended and graduated from University Of Washington School Of Medicine in 1987
  NPI Data:
  • NPI Number: 1669575445
  • Provider Enumeration Date: 09/06/2006
  • Last Update Date: 02/10/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 8426090010
  • Enrollment ID: I20101227000402

Medical Identifiers

Medical identifiers for James A Mack such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1669575445NPI-NPPES
00000833OtherMTBCBS PIN
114711100OtherWYMDCD PIN
0019975OtherMTMDCD PIN

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RE0101XInternal Medicine - Endocrinology, Diabetes & Metabolism 8739 (Montana)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Billings Clinic6002993516659

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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. James A Mack allows following entities to bill medicare on his behalf.
Entity NameBillings Clinic
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1326104845
PECOS PAC ID: 6002993516
Enrollment ID: O20080430000212

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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. James A Mack 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
James A Mack, MD
Po Box 35100,
Billings, MT 59107-5100

Ph: (406) 238-2500
James A Mack, MD
1045 N 30th St,
Billings, MT 59101-0733

Ph: (406) 238-2500

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Internal Medicine Doctors in Billings, MT

Charles Wittnam, MD
Endocrinology, Diabetes & Metabolism
Medicare: Not Enrolled in Medicare
Practice Location: 2675 Central Ave, Billings, MT 59102
Phone: 406-238-2500    
Phillip Embury Griffin, M.D.
Endocrinology, Diabetes & Metabolism
Medicare: Not Enrolled in Medicare
Practice Location: 2938 Rockrim Ln, Billings, MT 59102
Phone: 406-259-7582    
Megan B Littlefield, M.D.
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 123 S 27th St, Billings, MT 59101
Phone: 406-247-3350    Fax: 406-247-3389
Charles Mcclave, MD
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 2900 12th Ave N, Suite 160w, Billings, MT 59101
Phone: 406-237-8500    Fax: 406-237-8501
Karen C. Klee, MD
Endocrinology, Diabetes & Metabolism
Medicare: Not Enrolled in Medicare
Practice Location: 801 N 29th St, Billings, MT 59101
Phone: 406-238-2500    
Brock P. Whittenberger, MD
Endocrinology, Diabetes & Metabolism
Medicare: Medicare Enrolled
Practice Location: 801 N 29th St, Billings, MT 59101
Phone: 406-238-2500    
Dr. Benjamin Girton Plank, MD
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 801 N 29th St, Billings, MT 59101
Phone: 406-238-2500    

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