Dr. Fidel E. Castillo Diaz, MD
- Medicare services, 2024
- 180
- Medicare patients, 2024
- 28
- Part D claims, 2024
- 787
- MIPS score, 2024
- 93
- Hospital affiliations
- 1
- Practice address
- 1640 W Roosevelt Rd, Chicago, IL 60608
- Practice phone
- Call (312) 996-2655
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
The Board of Trustees of the University of Illinois
Chicago, Illinois
Find Dr. Castillo Diaz's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Fidel E. Castillo Diaz is a geriatric medicine (internal medicine) physician in Chicago, Illinois
Dr. Castillo Diaz practices at The Board of Trustees of the University of Illinois in Chicago, Illinois.
Dr. Castillo Diaz's NPI, 1689667347, was assigned on August 29, 2005. Dr. Castillo Diaz graduated from Universidad de Ciencias Medicas in 1998. Dr. Castillo Diaz holds Illinois license 036124066.
- NPI
- 1689667347NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2163619156
- NPI enumeration date
- August 29, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (312) 996-2655
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Fidel E. Castillo Diaz practices at The Board of Trustees of the University of Illinois in Chicago, Illinois
Dr. Castillo Diaz's primary practice is The Board of Trustees of the University of Illinois, at 1640 W Roosevelt Rd, Chicago, IL 60608 in Cook County. The practice phone is (312) 996-2655.
- The Board of Trustees of the University of Illinois1640 W Roosevelt Rd, Chicago, IL 60608 · Cook CountyPhone(312) 996-2655
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Fidel E. Castillo Diaz is affiliated with 3 sites of care and 1 medical group
Dr. Castillo Diaz's primary practice is The Board of Trustees of the University of Illinois in Chicago, Illinois. Dr. Castillo Diaz is also affiliated with University of Illinois Hospital. The medical group on file is University of Illinois Physicians Group (UIPG). Dmand AI also links Dr. Castillo Diaz to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Fidel E. Castillo Diaz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Castillo Diaz practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| The Board of Trustees of the University of Illinois | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Fidel E. Castillo Diaz is one of 135 geriatric medicine (internal medicine) physicians in Illinois
Geriatric medicine is Dr. Castillo Diaz's primary specialty in the NPI Registry, under taxonomy code 207RG0300X. Dr. Castillo Diaz is board certified in geriatric medicine by the American Board of Internal Medicine. Dmand AI has Dr. Castillo Diaz's licenses on file in 3 states: Illinois, Florida and Puerto Rico.
Specialties and state licenses
- Geriatric medicine (internal medicine), IllinoisPrimary
- Florida license
- Puerto Rico license
Clinical focus
Dmand AI lists alzheimer's disease, arthritis, chronic diabetes, chronic kidney disease, diabetic emergency, fluid and electrolyte imbalances, osteoporosis and rash among the conditions Dr. Castillo Diaz treats.
Geriatric medicine (internal medicine) physicians near Dr. Castillo Diaz
Counts of geriatric medicine (internal medicine) physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Fidel E. Castillo Diaz billed Medicare for 180 services in 2024
CMS data shows 180 Medicare services from Dr. Castillo Diaz across 6 procedure codes in 2024, for 28 Medicare patients. Medicare paid $9,008 for them. Every service was in an office.
Dr. Castillo Diaz's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 662024: 683%
- Surgery
- 2023: 392024: 428%
- Lab and pathology
- 2023: 312024: 3616%
- Other services
- 2023: 132024: 2377%
- Tests and treatments
- 2023: 122024: 118%
Dr. Castillo Diaz compared with the Illinois median for geriatric medicine (internal medicine) physicians, 2024
- Dr. Castillo Diaz
- Illinois median
- Medicare services
- 180vs 54667% below
- Medicare patients
- 28vs 20086% below
- Part D claims
- 475vs 78139% below
Medians across 137 geriatric medicine (internal medicine) physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Castillo Diaz's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Castillo Diaz and other geriatric medicine (internal medicine) physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Fidel E. Castillo Diaz treated 28 Medicare patients in 2024, average age 85
CMS counts 28 Medicare patients who saw Dr. Castillo Diaz in 2024. The largest group is 85 and over, with 16 patients. 75% of them have high blood pressure, and 64% have arthritis. 61% are also on Medicaid. Their average risk score is 1.90, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Castillo Diaz's median patient age at 84, with 33% women.
Dr. Castillo Diaz's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Castillo Diaz's Medicare patients by sex, 2024
- Women1761%
- Men1139%
Chronic conditions among Dr. Castillo Diaz's Medicare patients, 2024
- High blood pressure75%
- Arthritis64%
- Diabetes64%
- High cholesterol39%
Share of Medicare patients with each condition. A patient can have several.
Dr. Castillo Diaz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 84
Patient panel by sex, all payers
- Women33%
- Men63%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Fidel E. Castillo Diaz wrote 787 Medicare Part D claims in 2024
In 2024, Dr. Castillo Diaz wrote 787 Medicare Part D claims for 53 patients. 82% of them were for generic drugs. CMS names the drug for 475 of them, across 21 drugs with 11 or more claims each, at $25,556 in total drug cost. In 2023, CMS named 421 claims across 19 drugs.
Dr. Castillo Diaz's Part D claims by kind of drug, 2024
- Generic643 claims82%
- Brand-name and other144 claims18%
Dr. Castillo Diaz's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Castillo Diaz's Part D claims, 2024
- Opioids2%13 of 787 claims
- Antibiotics2%12 of 787 claims
- Antipsychotics, patients 65 and over2%15 of 787 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4212024: 47513%
Drugs named by CMS: 21 in 2024, 19 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Fidel E. Castillo Diaz scored 93 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Castillo Diaz for performance year 2024, reported as part of a group. Dr. Castillo Diaz accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Castillo Diaz's MIPS scores, performance year 2024
- 93of 100Final score
- 73.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 71of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Fidel E. Castillo Diaz has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Castillo Diaz, most recently Service Award in 2021. Dr. Castillo Diaz serves on Dementia Committee and Medical Organization for Latino Advancement.
Awards and honors for Dr. Castillo Diaz
- 2021
- Service Award
- 2017
- Scholars and Leaders in Interprofessional Geriatrics
Dr. Castillo Diaz's committees and leadership roles
- Dementia CommitteeConsultant
- 2023 to present
- Medical Organization for Latino AdvancementBoard Member
- 2017 to present
Source: Dmand AI Professional Profile Data
Dr. Fidel E. Castillo Diaz graduated from Universidad de Ciencias Medicas
Dr. Castillo Diaz graduated from Universidad de Ciencias Medicas in 1998. Dr. Castillo Diaz is a member of ACP, AGS and AMA.
- Medical school
- Board certified in geriatric medicine
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Fidel E. Castillo Diaz accepts plans from 11 insurance carriers
Dr. Castillo Diaz is in network with 11 carriers, including Elevance, Aetna and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Elevance
- Aetna
- Blue Cross Blue Shield of Michigan
- Cigna
- HCSC
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- +3 more carriersWith a free account
Plan types Dr. Castillo Diaz accepts, by number of carriers
- Medicare9
- PPO8
- HMO6
- POS6
- EPO3
- Medicaid2
Source: Dmand AI Insurance Network Data
Sources for Dr. Fidel E. Castillo Diaz's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Fidel E. Castillo Diaz
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Fidel E. Castillo Diaz's NPI number?
Dr. Fidel E. Castillo Diaz's NPI number is 1689667347. It was assigned on August 29, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Fidel E. Castillo Diaz?
Dr. Fidel E. Castillo Diaz is a geriatric medicine (internal medicine) physician in Chicago, Illinois. The primary specialty in the NPI Registry is Geriatric Medicine (Internal Medicine) Physician (taxonomy code 207RG0300X).
Where does Dr. Fidel E. Castillo Diaz practice?
Dr. Castillo Diaz practices at 1640 W Roosevelt Rd, Chicago, IL 60608. Dr. Castillo Diaz's primary practice is The Board of Trustees of the University of Illinois in Chicago, Illinois. Dmand AI also links Dr. Castillo Diaz to 1 group practice or clinic.
What is Dr. Fidel E. Castillo Diaz's office phone number?
The practice phone on file for Dr. Castillo Diaz is (312) 996-2655.
What is Dr. Fidel E. Castillo Diaz's medical license number?
Dr. Castillo Diaz holds Illinois license 036124066, one of the licenses on file in 3 states.
Which states has Dr. Fidel E. Castillo Diaz been licensed in?
Dmand AI has state licenses on file for Dr. Castillo Diaz in Illinois (2009 to 2026), Florida (2009 to 2017) and Puerto Rico (2007 to 2016).
Which hospitals is Dr. Fidel E. Castillo Diaz affiliated with?
Dr. Castillo Diaz is affiliated with University of Illinois Hospital.
What medical group is Dr. Fidel E. Castillo Diaz part of?
Dr. Castillo Diaz is linked to University of Illinois Physicians Group (UIPG).
Does Dr. Fidel E. Castillo Diaz accept Medicare?
Yes. CMS data shows Dr. Castillo Diaz billed Medicare for 180 services in 2024, and Dr. Castillo Diaz accepts Medicare assignment.
What is Dr. Fidel E. Castillo Diaz's MIPS score?
Dr. Castillo Diaz's MIPS final score for performance year 2024 is 93 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Fidel E. Castillo Diaz see?
CMS counts 28 Medicare patients who saw Dr. Castillo Diaz in 2024, with an average age of 85.
Is Dr. Fidel E. Castillo Diaz board certified?
Yes. Dr. Castillo Diaz is board certified in geriatric medicine by the American Board of Internal Medicine.
What services does Dr. Fidel E. Castillo Diaz bill to Medicare?
In 2024, Dr. Castillo Diaz's most billed Medicare services were office visit, established patient (99214), surgery: heart and blood vessels (36415) and lab and pathology test (83036).
Where did Dr. Fidel E. Castillo Diaz go to medical school?
Dr. Castillo Diaz graduated from Universidad de Ciencias Medicas in 1998.
What drugs does Dr. Fidel E. Castillo Diaz prescribe most?
In 2024 Medicare Part D data, Dr. Castillo Diaz's most prescribed drugs by claims were Amlodipine Besylate, Metformin HCl and Lisinopril.
How long has Dr. Fidel E. Castillo Diaz been practicing?
Dr. Castillo Diaz graduated from medical school in 1998, 28 years ago.
What insurance does Dr. Fidel E. Castillo Diaz accept?
Dr. Castillo Diaz is in network with 11 carriers, including Elevance, Aetna and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
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