Placeholder Photo for James A. Mack, MD

An endocrinologist in Billings, Dr. James Mack diagnoses, treats, and manages endocrine disorders, or those affecting the body's secretion of hormones such as thyroid problems or diabetes.

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Dr. Mack

Offices of Dr. Mack See Insurance
of Dr. Mack

Billings Clinic  

Accepting New Patients?

Yes, Dr. James A. Mack is accepting new patients at this office.


801 N 29th Street, Billings, MT 59101-0909

Office Details

Doctor Specialty Endocrinology
Accepting New Patients? Yes
Practice Specialty Multi Specialty
Languages Spoken English

Billings Clinic  

Accepting New Patients?

Yes, Dr. James A. Mack is accepting new patients at this office.



1045 N, 30th Diabetes and Endocrin, Billings, MT 59101-0733

Office Details

Doctor Specialty Endocrinology
Accepting New Patients? Yes
Languages Spoken English

Insurance Accepted  

  • Medicare

About Dr. Mack
Dr. Mack


Dr. James Mack graduated from University of Washington School of Medicine in 1987.

Dr. Mack has two offices in Montana where he specializes in Endocrinology.

Dr. Mack works with one hundred and eighty-one doctors including Dr. Breanne Terakedis and Dr. John Schallenkamp.


Education & Training  

Hospital Affiliations

  • Billings Clinic
  • Bozeman Deaconess Health Services
  • Memorial Hospital Association
  • Riverton Memorial Hospital
  • Powell Valley Health Care

Languages Spoken  

  • English

Dr. Mack's Medicare Fee‑for‑Service Data (2014)  

Please Note: The information displayed below is sourced from the 2014 Medicare Physician and Other Supplier National Provider Identifier (NPI) Aggregate Report. It's important to remember that the statistics below are not inclusive of all patients treated by Dr. Mack, but only those who participate in Medicare.

  • Doctor participates in Medicare?: Yes 
  • Number of HCPCS Codes: 28 
  • Number of Services: 533 
  • Medical Suppress Indicator:  
  • Number of HCPCS Associated With Medical Services: 28 
  • Number of Medical Services: 533 
  • Number of Medicare Patients with Medical Services: 276 
  Medicare Patient Demographics
  • Total Number of Medicare Patients: 276 
  • Average Age of Medicare Patients: 71 
  • Number of Patients Under Age 65: 55 
  • Number of Patients Age 65 to 74: 124 
  • Number of Patients Age 75 to 84: 71 
  • Number of Patients Over Age 84: 26 
  • Number of Female Patients : 204 
  • Number of Male Patients: 72 
  • Number of Non-Hispanic White Patients: 260 
  • Number of Black or African American Patients: 0 
  • Number of Asian Pacific Islander Patients: 0 
  • Number of Hispanic Patients: 0 
  • Number of American Indian/Alaska Native Patients: 0 
  • Number of Patients with Race Not Elsewhere Classified: 0 
  • Number of Patients with Medicare Only Entitlement: 222 
  • Number of Patients with Medicare & Medicaid Entitlement: 54 
  Medicare Patient Condition Demographics
  • Percent of Patients with Atrial Fibrillation: 8% 
  • Percent of Patients with Alzheimer’s Disease or Dementia: 6% 
  • Percent of Patients with Asthma: 5% 
  • Percent of Patients with Cancer: 7% 
  • Percent of Patients with Heart Failure: 17% 
  • Percent of Patients with Chronic Kidney Disease: 30% 
  • Percent of Patients with Chronic Obstructive Pulmonary Disease: 11% 
  • Percent of Patients with Depression: 31% 
  • Percent of Patients with Diabetes: 40% 
  • Percent of Patients with Hyperlipidemia: 47% 
  • Percent of Patients with Hypertension (High Blood Pressure): 56% 
  • Percent of Patients with Ischemic Heart Disease: 27% 
  • Percent of Patients with Osteoporosis: 33% 
  • Percent of Patients with Rheumatoid Arthritis / Osteoarthritis: 32% 
  • Percent of Patients with Schizophrenia / Other Psychotic Disorders: 4% 
  • Percent of Patients with Stroke: 5% 
  Medicare Payments Data
  • Total Submitted Charge Amount: $50,268.00 
  • Total Medicare Allowed Amount: $41,121.37 
  • Total Medicare Payment Amount: $29,431.66 
  • Total Medicare Standardized Payment Amount: $29,207.47 
  • Total Medical Submitted Charge Amount: $50,268.00 
  • Total Medical Medicare Allowed Amount: $41,121.37 
  • Total Medical Medicare Payment Amount: $29,431.66 
  • Total Medical Medicare Standardized Payment Amount: $29,207.47 
  Medicare Prescription Drug Data
  • Drug Suppress Indicator: n/a 
  • Number of HCPCS Associated With Drug Services: 0 
  • Number of Drug Services: 0 
  • Number of Medicare Beneficiaries With Drug Services: 0 
  • Total Drug Submitted Charge Amount: $0.00 
  • Total Drug Medicare Allowed Amount: $0.00 
  • Total Drug Medicare Payment Amount: $0.00 
  • Total Drug Medicare Standardized Payment Amount: $0.00 

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