Dr. John Willard Barrett, DO
- Medicare services, 2016
- 1,752
- Part D claims, 2018
- 11
- Industry payments
- $417
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 360 Kingstown Rd, Narragansett, RI 02882-3239
- Practice phone
- Call (401) 783-3334
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kenneth J. Hathaway
Primary care practice · Narragansett, Rhode Island
Find Dr. Barrett'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 Willard Barrett is an internist in Wakefield, Rhode Island
Dr. Barrett practices at Kenneth J. Hathaway in Narragansett, Rhode Island.
Dr. Barrett's NPI, 1245264688, was assigned on July 10, 2006. Dr. Barrett holds Rhode Island license DO328.
- NPI
- 1245264688NPI Registry (opens in a new tab)
- NPI enumeration date
- July 10, 2006
- NPI status
- Active
- Practice phone
- (401) 783-3334
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Willard Barrett practices in Narragansett and Wakefield
Dr. Barrett's primary practice is Kenneth J. Hathaway, at 360 Kingstown Rd, Narragansett, RI 02882-3239. The practice phone is (401) 783-3334. The NPI Registry lists Dr. Barrett's practice address as 100 Kenyon Ave, Wakefield, RI 02879.
- Kenneth J. HathawayPrimary360 Kingstown Rd, Narragansett, RI 02882-3239Phone(401) 783-3334
- NPI Registry address100 Kenyon Ave, Wakefield, RI 02879 · Washington CountyPhone(401) 783-3334
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. John Willard Barrett is affiliated with 1 site of care and 1 medical group
Dr. Barrett's primary practice is Kenneth J. Hathaway in Narragansett, Rhode Island. Dmand AI also links Dr. Barrett to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. John Willard Barrett's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Barrett practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kenneth J. Hathaway | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Willard Barrett is one of 805 internists in Rhode Island
Internal medicine is Dr. Barrett's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Barrett is licensed in Rhode Island.
Specialties and state licenses
- Internal medicine, Rhode IslandPrimary
Internists near Dr. Barrett
Counts of internists 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 Willard Barrett billed Medicare for 1,752 services in 2016
CMS data shows 1,752 Medicare services from Dr. Barrett across 10 procedure codes in 2016. Medicare paid $121,641 for them. Every service was in an office.
Dr. Barrett's Medicare services by type, 2016
- Office and hospital visits1,263
- Other services346
- Tests and treatments143
Dr. Barrett compared with the Rhode Island median for internists, 2016
- Dr. Barrett
- Rhode Island median
- Medicare services
- 1,752vs 3425.1 times
- Part D claims
- 11vs 28496% below
Medians across 772 internists in Rhode Island with Dmand AI profiles that report each measure.
Dr. Barrett's most billed Medicare procedure codes, 2016
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. Barrett?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Barrett and other internists in Rhode Island.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Willard Barrett's patients have a median age of 71
Across all payers, Dmand AI patient panel data puts Dr. Barrett's median patient age at 71, with 31% women.
Dr. Barrett's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women31%
- Men69%
Source: Dmand AI Patient Panel Data
Dr. John Willard Barrett wrote 11 Medicare Part D claims in 2018
In 2018, Dr. Barrett wrote 11 Medicare Part D claims. They cover 1 drug, with $83 in total drug cost. In 2017, CMS named 855 claims across 31 drugs.
Dr. Barrett's most prescribed drugs by claims, 2018
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2017 to 2018
- 2017
- 2018
- Claims for drugs CMS names
- 2017: 8552018: 1199%
Drugs named by CMS: 1 in 2018, 31 in 2017.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. John Willard Barrett received $417 in industry payments from 2016 to 2025
CMS Open Payments shows 8 general payments to Dr. Barrett from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Merck Sharp & Dohme Corporation paid the most, $176.
General payments to Dr. Barrett by program year, 2016 to 2025
Companies that paid Dr. Barrett the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. John Willard Barrett'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Willard Barrett
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 Willard Barrett's NPI number?
Dr. John Willard Barrett's NPI number is 1245264688. It was assigned on July 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Willard Barrett?
Dr. John Willard Barrett is an internist in Wakefield, Rhode Island. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John Willard Barrett practice?
Dr. Barrett practices at 360 Kingstown Rd, Narragansett, RI 02882-3239. Dr. Barrett also practices at 100 Kenyon Ave, Wakefield, RI 02879. Dr. Barrett's primary practice is Kenneth J. Hathaway in Narragansett, Rhode Island. Dmand AI also links Dr. Barrett to 1 medical group.
What is Dr. John Willard Barrett's office phone number?
The practice phone on file for Dr. Barrett is (401) 783-3334.
What is Dr. John Willard Barrett's medical license number?
Dr. Barrett holds Rhode Island license DO328.
Does Dr. John Willard Barrett accept Medicare?
Yes. CMS data shows Dr. Barrett billed Medicare for 1,752 services in 2016.
What services does Dr. John Willard Barrett bill to Medicare?
In 2016, Dr. Barrett's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and care management and other visits (99497).
What drugs does Dr. John Willard Barrett prescribe most?
In 2018 Medicare Part D data, Dr. Barrett's most prescribed drugs by claims were Venlafaxine HCl ER.
Has Dr. John Willard Barrett received payments from drug or device companies?
CMS Open Payments shows $417 in general payments to Dr. Barrett from 5 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. John Willard Barrett been practicing?
Dr. Barrett's NPI was assigned in 2006.
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