DR. FIDEL E CASTILLO DIAZ (MD) – Geriatric Medicine (Internal Medicine) Physician, NPI 1689667347
Geriatric Medicine (Internal Medicine) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
8,824 INTERNAL MEDICINE in IL
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Provider Addresses for DR. FIDEL E CASTILLO DIAZ (MD)
840, South Wood Street, Near West Side, Illinois Medical District, Chicago, Cook County, Illinois, 60608, United States
M-C 717 CSN 440
CHICAGO, IL 606124325
Phone:
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
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Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2010-12-02
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20101202000876 | I | Geriatric Medicine | IL | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 66 | 31 | $0 |
| 36415 | Insertion of needle into vein for collection of blood sample | 39 | 22 | $0 |
| 83036 | Hemoglobin a1c level | 31 | 15 | $0 |
| G0008 | Administration of influenza virus vaccine | 13 | 13 | $0 |
| 90694 | Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage | 12 | 12 | $0 |
Insurance plans in this area (ZIP 60612)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine | IL | |
| O B S T E T R I C S/ G Y N E C O L O G Y | IL | |
| - | IL | |
| - | IL | |
| Gastroenterology, Internal Medicine | WI | |
| - | IL | |
| O P H T H A L M O L O G Y | NY | |
| O T O L A R Y N G O L O G Y | CA | |
| Certified Registered Nurse Anesthetist (Crna) | IA | |
| G A S T R O E N T E R O L O G Y | FL |
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