Dr. John D. Granquist, MD
- Medicare services, 2024
- 7,898
- Medicare patients, 2024
- 3,903
- Part D claims, 2024
- 7,268
- MIPS score, 2024
- 93
- Hospital affiliations
- 6
- Practice address
- 80 Seymour Street, Hartford, CT 06102
- Practice phone
- Call (860) 545-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Granquist's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John D. Granquist is a cardiologist in Hartford, Connecticut
Dr. Granquist practices at Hartford Hospital in Hartford, Connecticut, part of Hartford HealthCare.
Dr. Granquist's NPI, 1699821892, was assigned on January 28, 2007. Dr. Granquist graduated from Tufts University School of Medicine in 2000. Dr. Granquist holds Connecticut license 045097.
- NPI
- 1699821892NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5294795621
- NPI enumeration date
- January 28, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (860) 545-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John D. Granquist practices at Hartford Hospital in Hartford, Connecticut
Dr. Granquist's primary practice is Hartford Hospital, at 80 Seymour Street, Hartford, CT 06102 in Hartford County. The practice phone is (860) 545-5000.
- Hartford Hospital80 Seymour Street, Hartford, CT 06102 · Hartford CountyPhone(860) 545-5000
Source: Dmand AI Affiliation Data
Dr. John D. Granquist is affiliated with 7 sites of care and 4 medical groups
Dr. Granquist's primary practice is Hartford Hospital in Hartford, Connecticut, part of Hartford HealthCare. Dr. Granquist is also affiliated with Backus Hospital. The medical group on file is Hartford Hospital. Dmand AI also links Dr. Granquist to 4 more hospitals, 3 medical groups and 1 group practice or clinic, each named with a free account. Dr. Granquist's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John D. Granquist's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Granquist practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hartford Hospital | Available with a free account |
| +6 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Hartford HealthCare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John D. Granquist is one of 423 cardiologists in Connecticut
Cardiovascular disease is Dr. Granquist's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Granquist is licensed in Connecticut.
Specialties and state licenses
- Cardiovascular disease, ConnecticutPrimary
Cardiologists near Dr. Granquist
Counts of cardiologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John D. Granquist billed Medicare for 7,898 services in 2024
CMS data shows 7,898 Medicare services from Dr. Granquist across 22 procedure codes in 2024, for 3,903 Medicare patients. Medicare paid $260,978 for them.
Dr. Granquist's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 6,0762024: 6,71611%
- Office and hospital visits
- 2023: 9042024: 9819%
- Drugs given in the office
- 2023: 602024: 8847%
- Other services
- 2023: 502024: 7550%
- Imaging
- 2023: 262024: 3846%
Where Dr. Granquist's Medicare services took place, 2024
- In an office3,12140%
- In a facility4,77760%
Dr. Granquist compared with the Connecticut median for cardiologists, 2024
- Dr. Granquist
- Connecticut median
- Medicare services
- 7,898vs 1,3585.8 times
- Medicare patients
- 3,903vs 6805.7 times
- Part D claims
- 6,963vs 1,5734.4 times
Medians across 415 cardiologists in Connecticut with Dmand AI profiles that report each measure.
Dr. Granquist's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Granquist?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Granquist and other cardiologists in Connecticut.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John D. Granquist treated 3,903 Medicare patients in 2024, average age 76
CMS counts 3,903 Medicare patients who saw Dr. Granquist in 2024. The largest group is 75 to 84, with 1,381 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 29% are also on Medicaid. Their average risk score is 2.09, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Granquist's median patient age at 65, with 48% women.
Dr. Granquist's Medicare patients by age, 2024
Dr. Granquist's Medicare patients by sex, 2024
- Women1,94850%
- Men1,95550%
Chronic conditions among Dr. Granquist's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis50%
- Ischemic heart disease50%
- Heart failure42%
- Atrial fibrillation41%
- Chronic kidney disease41%
- Anxiety40%
Share of Medicare patients with each condition. A patient can have several.
Dr. Granquist's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women48%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John D. Granquist wrote 7,268 Medicare Part D claims in 2024
In 2024, Dr. Granquist wrote 7,268 Medicare Part D claims for 952 patients. 79% of them were for generic drugs. CMS names the drug for 6,963 of them, across 53 drugs with 11 or more claims each, at $2,021,234 in total drug cost. In 2023, CMS named 6,328 claims across 53 drugs.
Dr. Granquist's Part D claims by kind of drug, 2024
- Generic5,713 claims79%
- Brand-name1,555 claims21%
Dr. Granquist's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Granquist's Part D claims, 2024
- Antibiotics1%51 of 7,268 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6,3282024: 6,96310%
Drugs named by CMS: 53 in 2024, 53 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. John D. Granquist scored 93 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Granquist for performance year 2024, reported as part of a group. Dr. Granquist accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Granquist's MIPS scores, performance year 2024
- 93of 100Final score
- 75.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 71of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. John D. Granquist received $101 in industry payments from 2020 to 2025
CMS Open Payments shows 5 general payments to Dr. Granquist from 4 drug and device companies from 2020 to 2025. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $45.
General payments to Dr. Granquist by program year, 2020 to 2025
Companies that paid Dr. Granquist the most, 2020 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John D. Granquist graduated from Tufts University School of Medicine
Dr. Granquist graduated from Tufts University School of Medicine in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John D. Granquist's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John D. Granquist
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John D. Granquist's NPI number?
Dr. John D. Granquist's NPI number is 1699821892. It was assigned on January 28, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. John D. Granquist?
Dr. John D. Granquist is a cardiologist in Hartford, Connecticut. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. John D. Granquist practice?
Dr. Granquist practices at 80 Seymour Street, Hartford, CT 06102. Dr. Granquist's primary practice is Hartford Hospital in Hartford, Connecticut, part of Hartford HealthCare. Dmand AI also links Dr. Granquist to 4 hospitals, 3 medical groups and 1 group practice or clinic.
What is Dr. John D. Granquist's office phone number?
The practice phone on file for Dr. Granquist is (860) 545-5000.
What is Dr. John D. Granquist's medical license number?
Dr. Granquist holds Connecticut license 045097.
Which hospitals is Dr. John D. Granquist affiliated with?
Dr. Granquist practices at Hartford Hospital in Hartford, Connecticut. Dr. Granquist is also affiliated with Backus Hospital. Dmand AI links Dr. Granquist to 4 more hospitals.
What medical group is Dr. John D. Granquist part of?
Dr. Granquist is linked to Hartford Hospital. Dmand AI links Dr. Granquist to 3 more medical groups.
Does Dr. John D. Granquist accept Medicare?
Yes. CMS data shows Dr. Granquist billed Medicare for 7,898 services in 2024, and Dr. Granquist accepts Medicare assignment.
What is Dr. John D. Granquist's MIPS score?
Dr. Granquist's MIPS final score for performance year 2024 is 93 out of 100, reported as part of a group.
How many Medicare patients does Dr. John D. Granquist see?
CMS counts 3,903 Medicare patients who saw Dr. Granquist in 2024, with an average age of 76.
Show 5 more questionsShow fewer questions
What services does Dr. John D. Granquist bill to Medicare?
In 2024, Dr. Granquist's most billed Medicare services were heart test or procedure (93010), heart test or procedure (93000) and office visit, established patient (99214).
Where did Dr. John D. Granquist go to medical school?
Dr. Granquist graduated from Tufts University School of Medicine in 2000.
What drugs does Dr. John D. Granquist prescribe most?
In 2024 Medicare Part D data, Dr. Granquist's most prescribed drugs by claims were Metoprolol Succinate, Eliquis and Atorvastatin Calcium.
Has Dr. John D. Granquist received payments from drug or device companies?
CMS Open Payments shows $101 in general payments to Dr. Granquist from 4 companies from 2020 to 2025. The largest total came from Amgen Inc.
How long has Dr. John D. Granquist been practicing?
Dr. Granquist graduated from medical school in 2000, 26 years ago.
Selling to cardiovascular disease practices?
See cardiologists in Connecticut by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card