Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Myfanwy G Callahan, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1538428685

Myfanwy G Callahan, MD practises Internal Medicine in Medford, Massachusetts. Graduated from Clvlnd Clinic Lerner College of Med of Case Wstn Rsv University in 2012, 14 years ago. Practices with Atrius Health Inc, a 1,205-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts.

Years since qualifying
14
Trained at
Clvlnd Clinic Lerner College of Med of Case Wstn Rsv University
Licensed in
MA
In the registry since
2012
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Medford, MA

No coordinates on file. Search this address in Google Maps

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 263178 (MA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1538428685
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 10, 2012
Last updated in NPPESJanuary 7, 2021
Certification dateJanuary 7, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolCLVLND CLINIC LERNER COLLEGE OF MED OF CASE WSTN RSV UNIVERSITY
Graduated 2012 (14 years in practice)
Group practice Atrius Health Inc — 1205 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients325
Services billed 3,417 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Also affiliated with 1 inpatient rehabilitation facility, which CMS identifies by certification number only.

Colleagues at Atrius Health Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1205 clinicians in the practice; 12 are shown here.

Other providers in Medford