Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Fidel E Castillo Diaz, MD

Individual provider Geriatric Medicine (Internal Medicine) Physician · NPI 1689667347

Dr. Fidel E Castillo Diaz, MD is a Geriatric Medicine in Chicago, Illinois. Qualified in 1998, 28 years ago. Practices with The Board of Trustees of the University of Illinois, a 1,142-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
28
Licensed in
IL
In the registry since
2005
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

840 S Wood St M-C 717 Csn 440
Chicago, IL 60612-4325
Phone: (312) 996-7704
Fax: (312) 413-8283
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Geriatric Medicine (Internal Medicine) Physician (primary) Taxonomy 207RG0300X · Licence 036124066 (IL)

Record details

NPI number1689667347
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedAugust 29, 2005
Last updated in NPPESMarch 5, 2014
Mailing address840 S Wood St, M-C 717 Csn 440, Chicago, IL 60612-4325

Medicare enrollment

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

Medicare specialtyGERIATRIC MEDICINE
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1998 (28 years in practice)
Group practice The Board Of Trustees Of The University Of Illinois — 1142 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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