Frederick Stack, MD
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- NPI Number
- 1548256977
- Provider Type
- Individual Practitioner
- Credential
- MD
- Primary Specialty
- Allopathic & Osteopathic Physicians - Internal Medicine Physician
- License Number
- MD-46368
- Practice Address
- 801 5th ST
- City, State ZIP
- Sioux City, IA 51101
- Phone
- (712) 279-2010
- Last Updated
- June 8, 2026
- Source
- Publicly available data
Frederick Stack, MD is a internal medicine physician provider located in Sioux City, IA. They offer internal medicine physician services to patients in the Sioux City area.
As a internal medicine physician provider in Sioux City, this clinician evaluates and treats patients for a range of common conditions seen in Sioux City and throughout IA.
The practice is located at 801 5th ST, Sioux City, IA 51101. Patients can call 7122792010 to schedule an appointment or use the directions link above to find the office from anywhere in the area.
Patients typically visit this provider for patients see internists for annual physicals, management of chronic conditions such as diabetes, hypertension, and heart disease, second opinions, and coordination of care between specialists.
If you plan to see this provider, it is a good idea to confirm that the practice accepts your insurance and is in-network before scheduling. Coverage details vary by plan, and our quote tool can help you compare options in IA.
This profile was last verified on June 8, 2026. Provider information is sourced from publicly available data and may not reflect recent changes. Please confirm details directly with the practice before scheduling.
Call for hours and appointments. Hours may vary by provider and location.
A patient’s guide to internal medicine physician care in Sioux City, IA.
What a Internal Medicine Physician provider does
Internal medicine providers, also called internists, specialize in the prevention, diagnosis, and treatment of diseases in adults. They are trained to handle both common and complex illnesses and often manage patients with multiple chronic conditions.
Common conditions treated
Internists commonly treat hypertension, type 2 diabetes, coronary artery disease, chronic obstructive pulmonary disease (COPD), thyroid disorders, kidney disease, and arthritis. They also coordinate cancer screenings and geriatric assessments.
Common reasons to schedule a visit
Patients see internists for annual physicals, management of chronic conditions such as diabetes, hypertension, and heart disease, second opinions, and coordination of care between specialists.
What to expect during a visit
Expect a thorough review of your medical history, current medications, and lifestyle. Your internist may order blood work, imaging, or other diagnostic tests to support an accurate diagnosis and treatment plan.
Insurance coverage considerations
Medicare and most commercial insurance plans cover adult preventive visits and chronic care management. Verify network status before scheduling by using our quote tool.
How to choose the right internal medicine physician provider in Sioux City
Choose an internist with experience managing your specific conditions, convenient hospital affiliations, and a willingness to coordinate with any specialists you may need. Board certification in internal medicine signals additional training and commitment to ongoing education.
Looking for in-network coverage that includes this internal medicine physician provider? Compare health plans in IA →
Insurance acceptance not listed
The public NPI registry does not include insurance acceptance data. Contact the office directly to ask if they accept your insurance plan. You can also use our quote tool to find health plans in IA.
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Common questions about Frederick Stack, MD in Sioux City, IA.
How do I make an appointment with Frederick Stack, MD?
Call Frederick Stack, MD directly at their Sioux City office to schedule a visit. You can also use the contact form on this page to send a message and the practice will respond.
Does Frederick Stack, MD accept insurance?
Provider insurance information is not included in the public NPI registry data that powers this directory. Contact the office directly to ask whether they accept your specific insurance plan. You can also use our quote tool to find health plans in IA.
What are the office hours for Frederick Stack, MD in Sioux City?
Office hours for Frederick Stack, MD in Sioux City are not currently published. Call the practice directly to confirm hours before your visit.
Is parking available at Frederick Stack, MD's Sioux City location?
Most provider offices in Sioux City offer on-site or nearby street parking. Call Frederick Stack, MD in Sioux City ahead of time to confirm parking options and accessibility accommodations.
Does Frederick Stack, MD offer telehealth?
Many internal medicine physician providers in IA now offer telehealth visits for follow-ups, medication management, and routine consultations. Call Frederick Stack, MD to ask whether a telehealth visit is appropriate for your needs.
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Claim ProfileData is sourced from publicly available records. Public records do not confirm active license status, quality of care, insurance acceptance, or network participation. Please verify details directly with the provider before scheduling. Last updated June 8, 2026.