Dr. William I. Calhoun, MD
- Medicare services, 2024
- 3,475
- Medicare patients, 2024
- 1,491
- Part D claims, 2024
- 2,643
- MIPS score, 2024
- 91
- Hospital affiliations
- 3
- Practice address
- 55 Fogg Road, South Weymouth, MA 02190
- Practice phone
- Call (781) 340-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Calhoun'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. William I. Calhoun is a cardiologist in South Weymouth, Massachusetts
Dr. Calhoun practices at South Shore Hospital in South Weymouth, Massachusetts, part of South Shore Health System.
Dr. Calhoun's NPI, 1952324303, was assigned on July 26, 2006. Dr. Calhoun graduated from University of Massachusetts Medical School in 1983. Dr. Calhoun holds Massachusetts license 53819.
- NPI
- 1952324303NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1658328166
- NPI enumeration date
- July 26, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (781) 340-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William I. Calhoun practices at South Shore Hospital in South Weymouth, Massachusetts
Dr. Calhoun's primary practice is South Shore Hospital, at 55 Fogg Road, South Weymouth, MA 02190 in Norfolk County. The practice phone is (781) 340-8000.
- South Shore Hospital55 Fogg Road, South Weymouth, MA 02190 · Norfolk CountyPhone(781) 340-8000
Source: Dmand AI Affiliation Data
Dr. William I. Calhoun is affiliated with 5 sites of care and 2 medical groups
Dr. Calhoun's primary practice is South Shore Hospital in South Weymouth, Massachusetts, part of South Shore Health System. Dr. Calhoun is also affiliated with Brigham and Women's Hospital. The medical group on file is South Shore Cardiology. Dmand AI also links Dr. Calhoun to 1 more hospital, 2 group practices and clinics and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William I. Calhoun's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Calhoun practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| South Shore Hospital | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William I. Calhoun is one of 840 cardiologists in Massachusetts
Cardiovascular disease is Dr. Calhoun's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Calhoun is licensed in Massachusetts.
Specialties and state licenses
- Cardiovascular disease, MassachusettsPrimary
Cardiologists near Dr. Calhoun
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. William I. Calhoun billed Medicare for 3,475 services in 2024
CMS data shows 3,475 Medicare services from Dr. Calhoun across 17 procedure codes in 2024, for 1,491 Medicare patients. Medicare paid $153,670 for them.
Dr. Calhoun's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 2,1092024: 2,2979%
- Office and hospital visits
- 2023: 1,0332024: 91312%
- Lab and pathology
- 2023: 2122024: 24114%
- Imaging
- 2023: 742024: 2468%
- Other services
- 2023: 522024: 0100%
Where Dr. Calhoun's Medicare services took place, 2024
- In an office2,03959%
- In a facility1,43641%
Dr. Calhoun compared with the Massachusetts median for cardiologists, 2024
- Dr. Calhoun
- Massachusetts median
- Medicare services
- 3,475vs 1,6122.2 times
- Medicare patients
- 1,491vs 95656% above
- Part D claims
- 2,461vs 8462.9 times
Medians across 817 cardiologists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Calhoun'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Calhoun and other cardiologists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William I. Calhoun treated 1,491 Medicare patients in 2024, average age 77
CMS counts 1,491 Medicare patients who saw Dr. Calhoun in 2024. The largest group is 75 to 84, with 648 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 20% are also on Medicaid. Their average risk score is 1.87, 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. Calhoun's median patient age at 64, with 48% women.
Dr. Calhoun's Medicare patients by age, 2024
Dr. Calhoun's Medicare patients by sex, 2024
- Women76051%
- Men73149%
Chronic conditions among Dr. Calhoun's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis53%
- Ischemic heart disease50%
- Anxiety44%
- Atrial fibrillation42%
- Chronic kidney disease42%
- Heart failure40%
Share of Medicare patients with each condition. A patient can have several.
Dr. Calhoun's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William I. Calhoun wrote 2,643 Medicare Part D claims in 2024
In 2024, Dr. Calhoun wrote 2,643 Medicare Part D claims for 328 patients. 83% of them were for generic drugs. CMS names the drug for 2,461 of them, across 31 drugs with 11 or more claims each, at $504,551 in total drug cost. In 2023, CMS named 2,377 claims across 30 drugs.
Dr. Calhoun's Part D claims by kind of drug, 2024
- Generic2,182 claims83%
- Brand-name461 claims17%
Dr. Calhoun'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. Calhoun's Part D claims, 2024
- Antibiotics1%16 of 2,643 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: 2,3772024: 2,4614%
Drugs named by CMS: 31 in 2024, 30 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. William I. Calhoun scored 91 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 91 out of 100 for Dr. Calhoun for performance year 2024, reported individually. Dr. Calhoun accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Calhoun's MIPS scores, performance year 2024
- 91of 100Final score
- 78of 100Quality
- 40of 100Improvement Activities
- 85of 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
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Dr. William I. Calhoun received $458 in industry payments from 2016 to 2025
CMS Open Payments shows 11 general payments to Dr. Calhoun from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $202.
General payments to Dr. Calhoun by program year, 2016 to 2025
Companies that paid Dr. Calhoun the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William I. Calhoun graduated from University of Massachusetts Medical School
Dr. Calhoun graduated from University of Massachusetts Medical School in 1983.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William I. Calhoun'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. William I. Calhoun
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. William I. Calhoun's NPI number?
Dr. William I. Calhoun's NPI number is 1952324303. It was assigned on July 26, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William I. Calhoun?
Dr. William I. Calhoun is a cardiologist in South Weymouth, Massachusetts. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. William I. Calhoun practice?
Dr. Calhoun practices at 55 Fogg Road, South Weymouth, MA 02190. Dr. Calhoun's primary practice is South Shore Hospital in South Weymouth, Massachusetts, part of South Shore Health System. Dmand AI also links Dr. Calhoun to 1 hospital, 2 group practices and clinics and 1 medical group.
What is Dr. William I. Calhoun's office phone number?
The practice phone on file for Dr. Calhoun is (781) 340-8000.
What is Dr. William I. Calhoun's medical license number?
Dr. Calhoun holds Massachusetts license 53819.
Which hospitals is Dr. William I. Calhoun affiliated with?
Dr. Calhoun practices at South Shore Hospital in South Weymouth, Massachusetts. Dr. Calhoun is also affiliated with Brigham and Women's Hospital. Dmand AI links Dr. Calhoun to 1 more hospital.
What medical group is Dr. William I. Calhoun part of?
Dr. Calhoun is linked to South Shore Cardiology. Dmand AI links Dr. Calhoun to 1 more medical group.
Does Dr. William I. Calhoun accept Medicare?
Yes. CMS data shows Dr. Calhoun billed Medicare for 3,475 services in 2024, and Dr. Calhoun accepts Medicare assignment.
What is Dr. William I. Calhoun's MIPS score?
Dr. Calhoun's MIPS final score for performance year 2024 is 91 out of 100, reported individually.
How many Medicare patients does Dr. William I. Calhoun see?
CMS counts 1,491 Medicare patients who saw Dr. Calhoun in 2024, with an average age of 77.
Show 5 more questionsShow fewer questions
What services does Dr. William I. Calhoun bill to Medicare?
In 2024, Dr. Calhoun'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. William I. Calhoun go to medical school?
Dr. Calhoun graduated from University of Massachusetts Medical School in 1983.
What drugs does Dr. William I. Calhoun prescribe most?
In 2024 Medicare Part D data, Dr. Calhoun's most prescribed drugs by claims were Metoprolol Succinate, Eliquis and Lisinopril.
Has Dr. William I. Calhoun received payments from drug or device companies?
CMS Open Payments shows $458 in general payments to Dr. Calhoun from 5 companies from 2016 to 2025. The largest total came from Amgen Inc.
How long has Dr. William I. Calhoun been practicing?
Dr. Calhoun graduated from medical school in 1983, 43 years ago.
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