Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John W Diefenderfer, DO

Individual provider Family Medicine Physician · NPI 1407236185

John W Diefenderfer, DO practises Osteopathic Manipulative Medicine in Waterville, Maine. Qualified in 2011, 15 years ago. Practices with Mainegeneral Medical Center, a 556-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Florida and Maine.

Years since qualifying
15
Licensed in
FL, ME
In the registry since
2015
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

149 N St
Waterville, ME 04901-4974
Phone: (207) 861-5101
Fax: (207) 872-4341
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 15 E Chestnut St, Augusta, ME 04330 — (207) 623-6663

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence DO2785 (ME)
Family Medicine Physician Taxonomy 207Q00000X · Licence UO 4638 (FL)

Record details

NPI number1407236185
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedJune 8, 2015
Last updated in NPPESJanuary 20, 2021
Certification dateJanuary 20, 2021

Medicare enrollment

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

Medicare specialtyOSTEOPATHIC MANIPULATIVE MEDICINE
Medical schoolOTHER
Graduated 2011 (15 years in practice)
Group practice Mainegeneral Medical Center — 556 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients44
Services billed 90 a service is one billed item, such as a visit, a test or a procedure
Average patient age64

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.

Colleagues at Mainegeneral Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 556 clinicians in the practice; 12 are shown here.

Other providers in Waterville