Dr. Ian A. Roundtree, MD, PhD
- Part D claims, 2024
- 30
- Hospital affiliations
- 1
- Industry payments
- $125
- Medical groups
- 3
- State license
- 1
- Practice address
- 55 Fruit Street, Boston, MA 02114
- Practice phone
- Call (617) 726-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Roundtree'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. Ian A. Roundtree is a medical oncologist in Boston, Massachusetts
Dr. Roundtree practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Roundtree's NPI, 1861028961, was assigned on March 20, 2020. Dr. Roundtree graduated from University of Chicago, Pritzker School of Medicine in 2020. Dr. Roundtree holds Massachusetts license 1023051.
- NPI
- 1861028961NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0941610844
- NPI enumeration date
- March 20, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (617) 726-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ian A. Roundtree practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Roundtree's primary practice is Massachusetts General Hospital, at 55 Fruit Street, Boston, MA 02114 in Suffolk County. The practice phone is (617) 726-2000.
- Massachusetts General Hospital55 Fruit Street, Boston, MA 02114 · Suffolk CountyPhone(617) 726-2000
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ian A. Roundtree is affiliated with 1 site of care and 3 medical groups
Dr. Roundtree's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Roundtree to 2 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Ian A. Roundtree's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Roundtree practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Massachusetts General Hospital | Available with a free account |
| +2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Ian A. Roundtree is one of 290 medical oncologists in Massachusetts
Medical oncology is Dr. Roundtree's primary specialty in the NPI Registry, under taxonomy code 207RX0202X. Dr. Roundtree is licensed in Massachusetts.
Specialties and state licenses
- Medical oncology, MassachusettsPrimary
Medical oncologists near Dr. Roundtree
Counts of medical oncologists 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. Ian A. Roundtree's patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Dr. Roundtree's median patient age at 69, with 0% women.
Dr. Roundtree's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women0%
- Men100%
Source: Dmand AI Patient Panel Data
Dr. Ian A. Roundtree wrote 30 Medicare Part D claims in 2024
In 2024, Dr. Roundtree wrote 30 Medicare Part D claims for 20 patients. 87% of them were for generic drugs.
Dr. Roundtree's Part D claims by kind of drug, 2024
- Generic26 claims87%
- Brand-name and other4 claims13%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Ian A. Roundtree takes part in Medicare
Dr. Roundtree accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Ian A. Roundtree received $125 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Roundtree from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Aadi Bioscience, Inc. paid the most, $125.
Companies that paid Dr. Roundtree the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ian A. Roundtree graduated from University of Chicago, Pritzker School of Medicine
Dr. Roundtree graduated from University of Chicago, Pritzker School of Medicine in 2020.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Ian A. Roundtree'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | 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) |
| 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. Ian A. Roundtree
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. Ian A. Roundtree's NPI number?
Dr. Ian A. Roundtree's NPI number is 1861028961. It was assigned on March 20, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Ian A. Roundtree?
Dr. Ian A. Roundtree is a medical oncologist in Boston, Massachusetts. The primary specialty in the NPI Registry is Medical Oncology Physician (taxonomy code 207RX0202X).
Where does Dr. Ian A. Roundtree practice?
Dr. Roundtree practices at 55 Fruit Street, Boston, MA 02114. Dr. Roundtree's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Roundtree to 2 medical groups.
What is Dr. Ian A. Roundtree's office phone number?
The practice phone on file for Dr. Roundtree is (617) 726-2000.
What is Dr. Ian A. Roundtree's medical license number?
Dr. Roundtree holds Massachusetts license 1023051.
Which hospitals is Dr. Ian A. Roundtree affiliated with?
Dr. Roundtree practices at Massachusetts General Hospital in Boston, Massachusetts.
What medical group is Dr. Ian A. Roundtree part of?
Dr. Roundtree is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Roundtree to 2 more medical groups.
Does Dr. Ian A. Roundtree accept Medicare?
Yes. CMS lists Dr. Roundtree as accepting Medicare assignment.
Where did Dr. Ian A. Roundtree go to medical school?
Dr. Roundtree graduated from University of Chicago, Pritzker School of Medicine in 2020.
Has Dr. Ian A. Roundtree received payments from drug or device companies?
CMS Open Payments shows $125 in general payments to Dr. Roundtree from 1 company from 2025 to 2025. The largest total came from Aadi Bioscience, Inc.
How long has Dr. Ian A. Roundtree been practicing?
Dr. Roundtree graduated from medical school in 2020, 6 years ago.
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