JOHN DAVID MAYFIELD MD
NPI 1669030722
Internal Medicine in Boston, MA
About John David Mayfield Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN DAVID MAYFIELD MD (NPI 1669030722) is an individual internal medicine provider in Boston, Massachusetts, licensed in South Carolina (LL82596) and active in the NPI registry since June 2019. He is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
John David Mayfield Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show John Mayfield reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts and New Hampshire enrollments
- 6,360 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 clinicians in this Medicare group
Hampstead, NH 03841
- Reassigned Medicare billing, New Hampshire enrollment
- 2,620 clinicians in this Medicare group
Keene, NH 03431
- Reassigned Medicare billing, New Hampshire enrollment
- 2,999 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Massachusetts General Hospital
Acute Care Hospitals · Boston, MANewton-Wellesley Hospital
Acute Care Hospitals · Newton, MAMary Hitchcock Memorial Hospital
Acute Care Hospitals · Lebanon, NHNew London Hospital
Critical Access Hospitals · New London, NHAlice Peck Day Memorial Hospital
Critical Access Hospitals · Lebanon, NHPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02114 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Mayfield's NPI number?
The NPI number for John Mayfield is 1669030722. It was assigned to this individual provider in the NPPES registry on June 4, 2019.
Where is John Mayfield located?
John Mayfield practices at 55 Fruit St, Boston, MA 02114. The listed phone number is (617) 726-8323.
What is John Mayfield's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Mayfield enrolled in Medicare?
Yes. John Mayfield is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for John Mayfield's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Mayfield reassigns Medicare benefits to 4 organizations: Massachusetts General Physicians Organization Inc (Boston, MA), The General Hospital Corporation (Boston, MA), Mary Hitchcock Memorial Hospital (Hampstead, NH) and Dartmouth-Hitchcock Clinic (Keene, NH). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Mayfield's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Mayfield accept?
Health plans from Ambetter from NH Healthy Families, Anthem Blue Cross and Blue Shield and Taro Health list John Mayfield as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Mayfield affiliated with any hospitals?
According to CMS data, John Mayfield is affiliated with Massachusetts General Hospital, Newton-Wellesley Hospital, Mary Hitchcock Memorial Hospital, New London Hospital and Alice Peck Day Memorial Hospital.
When was this NPI record last updated?
The NPPES record for John Mayfield was last updated on June 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# John David Mayfield, MD · NPI 1669030722
Internal Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since June 4, 2019.
## Identity
- **NPI:** 1669030722 (Entity type: Individual)
- **Enumerated:** June 4, 2019
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** LL82596 (South Carolina)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 FRUIT ST, Boston, MA 02114-2621
- **Phone:** (617) 726-8323
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA); Mary Hitchcock Memorial Hospital (NPI 1699584219, Hampstead, NH); Dartmouth-Hitchcock Clinic (NPI 1174176861, Keene, NH) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Florida College Of Medicine, class of 2019
## Record status
- **NPPES last updated:** June 11, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1669030722) · Data from the CMS NPPES public registry.