Dr. John David Mayfield, MD
- Hospital affiliations
- 5
- Industry payments
- $66
- Medical groups
- 4
- State licenses
- 2
- Year NPI issued
- 2019
- 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. Mayfield'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 David Mayfield is an internist in Boston, Massachusetts
Dr. Mayfield practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Mayfield's NPI, 1669030722, was assigned on June 4, 2019. Dr. Mayfield graduated from University of Florida College of Medicine in 2019. Dr. Mayfield holds South Carolina license LL82596.
- NPI
- 1669030722NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0446683049
- NPI enumeration date
- June 4, 2019
- 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
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John David Mayfield practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Mayfield'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
Source: Dmand AI Affiliation Data
Dr. John David Mayfield is affiliated with 6 sites of care and 4 medical groups
Dr. Mayfield's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dr. Mayfield is also affiliated with Dartmouth Hitchcock Medical Center. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Mayfield to 3 more hospitals, 3 medical groups and 1 community health center, 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. John David Mayfield's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mayfield practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Massachusetts General Hospital | Available with a free account |
| +5 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 Mass General Brigham and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John David Mayfield is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Mayfield's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Mayfield's licenses on file in 2 states: South Carolina and Massachusetts.
Specialties and state licenses
- Internal medicine, South CarolinaPrimary
- Diagnostic radiology, Massachusetts
Internists near Dr. Mayfield
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 David Mayfield's patients have a median age of 63
Across all payers, Dmand AI patient panel data puts Dr. Mayfield's median patient age at 63, with 51% women.
Dr. Mayfield's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women51%
- Men47%
Source: Dmand AI Patient Panel Data
How Dr. John David Mayfield takes part in Medicare
Dr. Mayfield 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)
Dr. John David Mayfield received $66 in industry payments from 2024 to 2025
CMS Open Payments shows 3 general payments to Dr. Mayfield from 1 drug or device company from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $66.
General payments to Dr. Mayfield by program year, 2024 to 2025
Companies that paid Dr. Mayfield the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John David Mayfield graduated from University of Florida College of Medicine
Dr. Mayfield graduated from University of Florida College of Medicine in 2019.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John David Mayfield'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 patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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. John David Mayfield
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 David Mayfield's NPI number?
Dr. John David Mayfield's NPI number is 1669030722. It was assigned on June 4, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. John David Mayfield?
Dr. John David Mayfield is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John David Mayfield practice?
Dr. Mayfield practices at 55 Fruit Street, Boston, MA 02114. Dr. Mayfield's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Mayfield to 3 hospitals, 3 medical groups and 1 community health center.
What is Dr. John David Mayfield's office phone number?
The practice phone on file for Dr. Mayfield is (617) 726-2000.
What is Dr. John David Mayfield's medical license number?
Dr. Mayfield holds South Carolina license LL82596, one of the licenses on file in 2 states.
Which states has Dr. John David Mayfield been licensed in?
Dmand AI has state licenses on file for Dr. Mayfield in South Carolina and Massachusetts.
Which hospitals is Dr. John David Mayfield affiliated with?
Dr. Mayfield practices at Massachusetts General Hospital in Boston, Massachusetts. Dr. Mayfield is also affiliated with Dartmouth Hitchcock Medical Center. Dmand AI links Dr. Mayfield to 3 more hospitals.
What medical group is Dr. John David Mayfield part of?
Dr. Mayfield is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Mayfield to 3 more medical groups.
Does Dr. John David Mayfield accept Medicare?
Yes. CMS lists Dr. Mayfield as accepting Medicare assignment.
Where did Dr. John David Mayfield go to medical school?
Dr. Mayfield graduated from University of Florida College of Medicine in 2019.
Has Dr. John David Mayfield received payments from drug or device companies?
CMS Open Payments shows $66 in general payments to Dr. Mayfield from 1 company from 2024 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. John David Mayfield been practicing?
Dr. Mayfield graduated from medical school in 2019, 7 years ago.
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