Mercy Heart and Vascular Institute

Cardiology • Oskaloosa, IA • Since 1989

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About

Mason City Clinic is a multispecialty medical practice headquartered in Mason City, Iowa, offering cardiology services including heart failure care. The clinic operates four offices in the United States, with its main location at 250 S Crescent Dr, Mason City, IA 50401. Founded in 1989, it employs about 39 staff and provides a range of specialties (including bariatric surgery, orthopedics, allergy, neurology, and psychiatry). For cardiology/heart failure care in Mason City (and regionally in northern Iowa and southern Minnesota), the clinic is a primary option. Contact: 800-622-1411 or 641-494-5200. Website: mcclinic.com.

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Clinic Type

Cardiology (multi-location group)

Address

250 S. Crescent Drive, Mason City, IA 50401

Phone

641.494.5300

Email

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Opening Hours

Not published — contact the clinic to confirm hours.

Website

https://mcclinic.com/services/cardiology/

Services Offered

Cardiology

Technology & Equipment

Electrocardiogram (ECG or EKG)
Nuclear Stress Test
Implantable Cardioverter Defibrillator
Balloon Angioplasty
Cardiac Catheterization
Cardioversion

Insurance & Payment

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Languages Spoken

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Social Media

Twitter Youtube Facebook Linkedin

Photos

What Patients Say

Overall sentiment across review platforms: mixed

RateMDs (Dr. Samuel Congello): 5.0/5 stars (54 reviews)
Healthgrades (Dr. Samuel Congello): 4.9/5 stars (50 ratings)
Healthgrades (Dr. John Pargulski): 3.9/5 stars (7 ratings)

Patients praise

Professional, thorough, and attentive care
Clear explanations of conditions and treatment plans
Compassionate and kind staff interactions
Positive patient outcomes and life-saving interventions

Common complaints

Rudeness from staff or providers
Long wait times
Poor communication regarding condition and treatment plans
Difficulty scheduling appointments

"Dr. Congello spent all the time I needed. Very thorough. Had record so he could compare last test to recent tests. Explains well. Answerd all my questions. He is the best!! Genuinely cares for his patients."

— RateMDs

"Doctor was the rudist person I have ever dealt with, wondered why I was there. He was also 30 minutes late. Do yourself a favor and find a different cardiologist."

— Healthgrades

"They were all very professional, kind, and patient. They did an excellent job of explaining what was about to happen and of answering my questions. Excellent!!!"

— Mahaska Health testimonial

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].