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Dr. John Dickson Granquist, MD, FACC

Accepting New Patients
(Dr. John Granquist, M.D.)

(No ratings)

Specializes in: Adult Cardiology
Tufts University School of Medicine
Professional interests include: hypertension (high blood pressure), echocardiogram (echo), cardiomyopathy, and more.
305 Western Boulevard Suite 100
Glastonbury, CT 06033

Dr. John Dickson Granquist, MD, FACC is a cardiologist in Windsor, CT specializing in adult cardiology. He graduated from Tufts University School of Medicine. Dr. John Dickson Granquist, MD, FACC is affiliated with MidState Medical Center, Hartford Healthcare and Hartford Hospital Integrated Care Partners.

View Doctor's Full Profile (860) 522-0604

Office Locations

1060 Day Hill Road Suite 203
Windsor, CT 06095
open_in_new

Hartford Hospital Integrated Care Partners

305 Western Boulevard Suite 100
Glastonbury, CT 06033
(860) 522-0604
(860) 659-8077
open_in_new
85 Seymour Street Suite 719
Hartford, CT 06106
open_in_new

Some issues Dr. John Dickson Granquist, MD, FACC can help you with:

Coronary Artery Disease

Coronary artery disease (CAD) is the most common type of heart disease. It happens when the blood vessels carrying blood to the heart, called coronary arteries, narrow and harden. This occurs when cholesterol, a type of fat found in the blood, builds up to form plaque, which sticks to the inner walls of the arteries. As plaque accumulates, less blood can flow through the arteries, which may lead to the following:

  • Angina, which is chest pain that occurs when the heart does not receive enough blood flow.
  • Heart attack, which happens if the arteries leading to the heart are completely blocked.
  • Arrhythmia, or irregular heartbeat, which can develop if the heart does not have enough blood supply.
  • Heart failure, which may occur if a heart attack damages the heart and it becomes too weak to pump enough blood to the rest of the body.

Certain factors may increase risk for the disease, like smoking, lack of exercise, being overweight, high cholesterol, high blood pressure, and diabetes. CAD tends to develop over decades, so it can go undetected until it has become quite severe. A diagnosis may be established using such tests as:

  • Electrocardiogram (ECG), which records the heart's electrical activity over a period of time. ECGs can detect whether there is enough blood flow to the heart or if a heart attack has occurred.
  • Echocardiogram (echo), which creates images of the heart using sound waves. Echos can show whether the heart is able to pump blood normally.
  • Stress tests, where an ECG or echo is combined with exercise, like riding a stationary bike or walking on a treadmill. This test is done to find out if the heart can function properly while performing a strenuous activity.

Treatments for the disease include medications such as vasodilators, like nitroglycerin, which dilates (widens) the coronary arteries. CAD may also be treated by a procedure called angioplasty with stent placement, where a balloon is inflated inside a diseased artery to flatten the plaque deposits against the artery walls, creating more room for blood to flow.

In some severe cases of the disease, multiple arteries may be blocked, and an open heart surgery called coronary artery bypass surgery may be necessary. This operation transplants a vessel from another part of the body to form a graft that goes past the narrowed arteries, thus enabling blood to flow around those arteries.

Noteworthy Medicare Patient Procedures Performed by Dr. John Dickson Granquist, MD, FACC in 2023

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 25%

By Volume:

ambulatory cardiac monitoring
cardiac procedures
Doppler echocardiography
echocardiogram
ultrasound

By Affordability:

hospital care
inpatient care
inpatient hospital care

In 2012, among providers in related specialties within Connecticut, Dr. John Dickson Granquist, MD, FACC performed more ambulatory cardiac monitoring, cardiac procedures, Doppler echocardiography, echocardiogram (echo), and ultrasound (sonogram) procedures for Medicare patients than 75% of them and he also had a list price for hospital care, inpatient care, and inpatient hospital care (for patient admitted to hospital) that was lower than the list prices billed to Medicare by 75% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2012 were cardiac procedures, hospital care, inpatient care and ultrasound (sonogram).

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 20
cardiac procedures 481
doctor visit 1187
hospital care 423
inpatient care 423
nuclear scan 77
stress testing 145
ultrasound (sonogram) 316

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2013 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 21
cardiac procedures 485
doctor visit 1210
hospital care 298
inpatient care 298
nuclear scan 43
stress testing 117
ultrasound (sonogram) 347

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1545
Female 1691
Ethnicity
Non-Hispanic White 2641
Black 223
Hispanic 299
Asian 0
Other 42
Native American 0
Age
From 65 to 74 849
From 75 to 84 1004
85 and over 883
Less than 65 500

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2013

Hypertension 75
High Cholesterol 69
Stroke 11
Ischemic Heart Disease 62
Depression 32
Chronic Kidney Disease 42
Asthma 14
Osteoperosis 11
Atrial Fibrilation 32
Heart Failure 45
Chronic Obstructive Pulmonary Disease 24
Diabetes 41
Dementia 23
Cancer 14

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2014 were cardiac procedures, hospital care, inpatient care and ultrasound (sonogram).

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 31
cardiac procedures 413
doctor visit 1209
hospital care 405
inpatient care 405
nuclear scan 40
stress testing 113
ultrasound (sonogram) 269

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1605
Female 1623
Ethnicity
Non-Hispanic White 2656
Black 230
Hispanic 261
Asian 30
Other 51
Native American 0
Age
From 65 to 74 928
From 75 to 84 1063
85 and over 798
Less than 65 439

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2014

Hypertension 75
High Cholesterol 71
Stroke 11
Ischemic Heart Disease 62
Depression 32
Chronic Kidney Disease 43
Asthma 14
Osteoperosis 10
Atrial Fibrilation 33
Heart Failure 47
Chronic Obstructive Pulmonary Disease 26
Diabetes 42
Dementia 22
Cancer 16

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2015 were cardiac procedures, hospital care, inpatient care and ultrasound (sonogram).

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 26
cardiac procedures 416
doctor visit 1253
hospital care 364
inpatient care 364
nuclear scan 39
stress testing 107
ultrasound (sonogram) 283

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 3708
Female 3566
Ethnicity
Non-Hispanic White 5898
Black 534
Hispanic 628
Asian 0
Other 130
Native American 0
Age
From 65 to 74 2096
From 75 to 84 2296
85 and over 1806
Less than 65 1076

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2015

Hypertension 75
High Cholesterol 71
Stroke 13
Ischemic Heart Disease 61
Depression 34
Chronic Kidney Disease 47
Asthma 22
Osteoperosis 10
Atrial Fibrilation 33
Heart Failure 48
Chronic Obstructive Pulmonary Disease 27
Diabetes 42
Dementia 22
Cancer 15

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2016 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 32
cardiac procedures 582
doctor visit 1254
hospital care 287
inpatient care 287
nuclear scan 31
stress testing 91
ultrasound (sonogram) 459

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1909
Female 1829
Ethnicity
Non-Hispanic White 2958
Black 315
Hispanic 332
Asian 0
Other 75
Native American 0
Age
From 65 to 74 1112
From 75 to 84 1163
85 and over 923
Less than 65 540

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2016

Hypertension 75
High Cholesterol 70
Stroke 11
Ischemic Heart Disease 59
Depression 32
Chronic Kidney Disease 50
Asthma 31
Osteoperosis 10
Atrial Fibrilation 33
Heart Failure 45
Chronic Obstructive Pulmonary Disease 26
Diabetes 41
Dementia 25
Cancer 15

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2017 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 49
cardiac procedures 630
doctor visit 1187
hospital care 365
inpatient care 365
nuclear scan 13
stress testing 50
ultrasound (sonogram) 531

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1674
Female 1720
Ethnicity
Non-Hispanic White 2705
Black 281
Hispanic 279
Asian 49
Other 80
Native American 0
Age
From 65 to 74 1053
From 75 to 84 1094
85 and over 792
Less than 65 455

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2017

Hypertension 75
High Cholesterol 66
Stroke 11
Ischemic Heart Disease 57
Depression 33
Chronic Kidney Disease 49
Asthma 13
Osteoperosis 11
Atrial Fibrilation 31
Heart Failure 41
Chronic Obstructive Pulmonary Disease 25
Diabetes 40
Dementia 23
Cancer 15

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2018 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 38
cardiac procedures 582
doctor visit 927
hospital care 258
inpatient care 258
nuclear scan 15
stress testing 80
ultrasound (sonogram) 464

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1694
Female 1770
Ethnicity
Non-Hispanic White 2709
Black 281
Hispanic 335
Asian 0
Other 83
Native American 0
Age
From 65 to 74 1021
From 75 to 84 1095
85 and over 844
Less than 65 504

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2018

Hypertension 75
High Cholesterol 73
Stroke 12
Ischemic Heart Disease 58
Depression 36
Chronic Kidney Disease 53
Asthma 14
Osteoperosis 11
Atrial Fibrilation 33
Heart Failure 47
Chronic Obstructive Pulmonary Disease 27
Diabetes 42
Dementia 25
Cancer 16

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2019 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 53
cardiac procedures 703
doctor visit 1013
hospital care 266
inpatient care 266
nuclear scan 22
stress testing 79
ultrasound (sonogram) 571

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 2003
Female 2003
Ethnicity
Non-Hispanic White 3098
Black 334
Hispanic 396
Asian 0
Other 125
Native American 0
Age
From 65 to 74 1191
From 75 to 84 1293
85 and over 920
Less than 65 602

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2019

Hypertension 75
High Cholesterol 73
Stroke 12
Ischemic Heart Disease 57
Depression 37
Chronic Kidney Disease 56
Asthma 14
Osteoperosis 11
Atrial Fibrilation 32
Heart Failure 46
Chronic Obstructive Pulmonary Disease 27
Diabetes 43
Dementia 24
Cancer 15

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2020 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 46
cardiac procedures 407
doctor visit 774
hospital care 260
inpatient care 260
nuclear scan 28
stress testing 72
ultrasound (sonogram) 289

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1380
Female 1369
Ethnicity
Non-Hispanic White 2149
Black 235
Hispanic 252
Asian 0
Other 71
Native American 0
Age
From 65 to 74 844
From 75 to 84 873
85 and over 582
Less than 65 450

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2020

Hypertension 75
High Cholesterol 73
Stroke 11
Ischemic Heart Disease 56
Depression 38
Chronic Kidney Disease 57
Asthma 13
Osteoperosis 11
Atrial Fibrilation 31
Heart Failure 45
Chronic Obstructive Pulmonary Disease 26
Diabetes 40
Dementia 26
Cancer 15

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2021 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 58
cardiac procedures 387
doctor visit 826
hospital care 122
inpatient care 122
nuclear scan 21
stress testing 60
ultrasound (sonogram) 269

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1427
Female 1515
Ethnicity
Non-Hispanic White 2325
Black 214
Hispanic 256
Asian 0
Other 102
Native American 0
Age
From 65 to 74 901
From 75 to 84 956
85 and over 654
Less than 65 431

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2021

Hypertension 75
High Cholesterol 75
Stroke 12
Ischemic Heart Disease 57
Depression 37
Chronic Kidney Disease 57
Asthma 13
Osteoperosis 12
Atrial Fibrilation 30
Heart Failure 44
Chronic Obstructive Pulmonary Disease 23
Diabetes 41
Dementia 25
Cancer 16

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT during 2022 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

ambulatory monitoring 51
cardiac procedures 448
doctor visit 850
hospital care 139
inpatient care 139
nuclear scan 27
stress testing 75
ultrasound (sonogram) 322

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1646
Female 1730
Ethnicity
Non-Hispanic White 2732
Black 222
Hispanic 248
Asian 46
Other 128
Native American 0
Age
From 65 to 74 1049
From 75 to 84 1179
85 and over 705
Less than 65 443

Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC in 2022

Hypertension 75
High Cholesterol 75
Stroke 18
Ischemic Heart Disease 48
Depression 34
Chronic Kidney Disease 41
Asthma 16
Osteoperosis 16
Atrial Fibrilation 41
Heart Failure 40
Chronic Obstructive Pulmonary Disease 26
Diabetes 39
Dementia 18
Cancer 20

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John Dickson Granquist, MD, FACC for Medicare patients.

The highest averages for the top procedures that Dr. John Dickson Granquist, MD, FACC treated as a cardiologist in Windsor, CT were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

ambulatory monitoring 38
cardiac procedures 503
doctor visit 1062
hospital care 289
inpatient care 289
nuclear scan 32
stress testing 89
ultrasound (sonogram) 374

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John Dickson Granquist, MD, FACC.

Gender
Male 1690
Female 1710
Ethnicity
Black / African American 260
Asian / Pacific Islander 11
Non-Hispanic White 2715
Native American / Alaskan Native 0
Hispanic 298
Other 80
Age
75 to 84 1092
85 and over 809
Less than 65 494
65 to 74 1004

Average of Total of Conditions of Medicare patients treated by Dr. John Dickson Granquist, MD, FACC From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. John Dickson Granquist, MD, FACC treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension 68
High Cholesterol 65
Stroke 11
Ischemic Heart Disease 52
Depression 31
Chronic Kidney Disease 45
Asthma 14
Osteoporosis 10
Heart Failure 40
Chronic Obstructive Pulmonary Disease 23
Diabetes 37
Atrial Fibrillation 29
Dementia 21
Cancer 14

Education & Training

Dr. John Dickson Granquist, MD, FACC graduated from Tufts University School of Medicine. He completed residency at Tufts Medical Center. He has a state license in Connecticut.

Medical School: Tufts University School of Medicine

Residency: Tufts Medical Center

Licensed In: Connecticut

Affiliations & Hospitals

Dr. John Dickson Granquist, MD, FACC is associated with these hospitals and organizations:

MidState Medical Center
Hartford Healthcare
Hartford Hospital Integrated Care Partners

Insurance Information

Please note: Insurance information may change at any time, and the provider may accept your insurance plan even if it is not listed below. Please contact the provider's office to confirm that your insurance is accepted.

Dr. John Dickson Granquist, MD, FACC appears to accept the following insurance providers: CorVel, Great-West Healthcare, WellCare, Evercare, MultiPlan, United Healthcare, Aetna, Oxford Health Plans, Cigna, Coventry, Anthem, ConnectiCare, Focus Health Solutions, Prime Health, First Health, Private Healthcare Systems (PHCS), CarePartners of Connecticut, Senior Whole Health, Health Direct, Colonial Cooperative Care, BCBS Medicare, Inc., Health Connecticut, Health New England, Healthy Connecticut, Connecticare Commercial, Essence Healthcare, Connecticare Medicare, Community Health Network of Connecticut and Northeast Health Direct.

Insurance Accepted by Provider includes:

According to our sources, Dr. John Dickson Granquist, MD, FACC accepts the following insurance providers:

CorVel
Great-West Healthcare
WellCare
Evercare
MultiPlan
United Healthcare
Aetna
Oxford Health Plans
Cigna
Coventry
Anthem
ConnectiCare
Focus Health Solutions
Prime Health
First Health
Private Healthcare Systems (PHCS)
CarePartners of Connecticut
Senior Whole Health
Health Direct
Colonial Cooperative Care
BCBS Medicare
Inc.
Health Connecticut
Health New England
Healthy Connecticut
Connecticare Commercial
Essence Healthcare
Connecticare Medicare
Community Health Network of Connecticut
Northeast Health Direct

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. John Dickson Granquist, MD, FACC. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

Payments by Company
Janssen Pharmaceuticals, Inc $145 XARELTO
$145
Boston Scientific Corporation $116 DIAGNOSTIC
$116
AstraZeneca Pharmaceuticals LP $107 BRILINTA
$107
Amgen Inc. $70 Repatha
$45
$25
ZOLL Lifecor Corporation $21 LifeVest
$21
Other $103 Cardiac Diagnostics and Monitoring
$20 		VenaSeal
$19 		Microfixation-Oral and Maxillofacial
$18 		PEDIATRICS
$16 		BYSTOLIC
$15 		Other
$15
Types of Payments
Food and Beverage $490
Education $72

Biography

Dr. John Granquist is an adult cardiology specialist in Hartford, CT, Glastonbury, CT, and Windsor, CT. These areas are among his clinical interests: nuclear cardiology, heart failure, and hypertension (high blood pressure). He accepts Anthem, ConnectiCare, Blue California, and more. Dr. Granquist attended medical school at Tufts University School of Medicine. For his residency, Dr. Granquist trained at Tufts Medical Center. He is affiliated with MidState Medical Center. According to Hartford Healthcare, new patients are welcome to contact his office in Glastonbury, CT.

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