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

Christopher Michael Diefenbach, MD

Individual provider Orthopaedic Foot and Ankle Surgery Physician · NPI 1437440070

Christopher Michael Diefenbach, MD practises Orthopedic Surgery in Flagstaff, Arizona. Graduated from New York University School of Medicine in 2011, 15 years ago. Practices with Custom Physical Therapy Limited Partnership, a 81-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
15
Trained at
New York University School of Medicine
Licensed in
AZ
In the registry since
2011
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

107 E Oak Ave
Flagstaff, AZ 86001
Phone: (928) 779-7880
Fax: (928) 913-8801
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1485 N Turquoise Dr Ste 200, Flagstaff, AZ 86001-2000 — (928) 774-7757

Specialties & licences

Orthopaedic Foot and Ankle Surgery Physician (primary) Taxonomy 207XX0004X · Licence 53879 (AZ)
Orthopaedic Surgery Physician Taxonomy 207X00000X · Licence 53879 (AZ)

Record details

NPI number1437440070
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 1, 2011
Last updated in NPPESJuly 21, 2022

Medicare enrollment

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

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolNEW YORK UNIVERSITY SCHOOL OF MEDICINE
Graduated 2011 (15 years in practice)
Group practice Custom Physical Therapy Limited Partnership — 81 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Lower limb (leg) arthroscopy (minimally invasive joint repair) 1–10 times
Removal of nail tissue 1–10 times
Removal of tissue 1–10 times
Removal or shaving of skin growth 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients291
Services billed 1,031 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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Consulting Fee $19,950 7 payments
Food and Beverage $2,027 26 payments · a meal or drink at a meeting or visit, not a fee
Travel and Lodging $1,928 8 payments · travel or lodging paid or reimbursed, such as to attend a conference
Compensation for services other than consulting , including serving as faculty or as a speaker at a venue other than a continuing education program $1,400 1 payment
Education $173 2 payments · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

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

Colleagues at Custom Physical Therapy Limited Partnership

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 81 clinicians in the practice; 12 are shown here.