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

Dr. John Haynes Demenkoff, MD

Individual provider Anesthesiology Physician · NPI 1295718419

Dr. John Haynes Demenkoff, MD is an Internal Medicine in Phoenix, Arizona. Graduated from Harvard Medical School in 1974, 52 years ago. Practices with Mayo Clinic Arizona, a 1,616-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
52
Trained at
Harvard Medical School
Licensed in
AZ
In the registry since
2005
Specialties on file
3
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

5779 E Mayo Blvd
Phoenix, AZ 85054-4502
Phone: (480) 301-8000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 13400 E Shea Blvd, Scottsdale, AZ 85259-5452 — (480) 301-8000

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 29076 (AZ)
Anesthesiology Physician Taxonomy 207L00000X · Licence 29076 (AZ)
Pulmonary Disease Physician Taxonomy 207RP1001X · Licence 29076 (AZ)

Record details

NPI number1295718419
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 22, 2005
Last updated in NPPESOctober 2, 2020
Certification dateOctober 2, 2020

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesPULMONARY DISEASE
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 1974 (52 years in practice)
Group practice Mayo Clinic Arizona — 1616 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations6 on file with Medicare

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