Doctor profile · Federal record
Dr. Fidel Castillo Diaz, MD
Geriatric Medicine (Internal Medicine) Physician (CMS: Geriatric Medicine) · Chicago, IL
- NPI 1689667347
- Accepts Medicare
- MIPS 77.1 / 100 · 2023
- 28 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
840 S Wood St, M-C 717 Csn 440
Chicago, IL 606124325
(312) 996-7704
fax (312) 413-8283
Credentials & registration
- NPI registered
- August 2005 — 21 yrs on file
- Profile last updated
- March 5, 2014
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207RG0300X — NUCC code
- State license (1)
- Illinois #036124066
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1689667347. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
161
Distinct HCPCS
5
Medicare allowed
$10,777
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 66 | 31 | $134 | |
36415 |
Insertion of needle into vein for collection of blood sample | 39 | 22 | $8 | |
83036 |
Hemoglobin a1c level | 31 | 15 | $10 | |
G0008 |
Administration of influenza virus vaccine | 13 | 13 | $30 | |
90694 |
Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage | 12 | 12 | $75 |
In context: peer comparison
Among 17 peers in Chicago Geriatric Medicine (Internal Medicine) Physician, average services per provider: 88. This provider delivers 1.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
375
Patients
62
Total drug cost
$16,992
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Amlodipine Besylate | Generic | 45 | 14 | $637 |
| Losartan Potassium | Generic | 38 | 12 | $612 |
| Metformin Hcl | Generic | 37 | 13 | $571 |
| Levothyroxine Sodium | Generic | 36 | 0 | $888 |
| Lisinopril | Generic | 34 | 12 | $423 |
| Omeprazole | Generic | 29 | 0 | $371 |
| Atorvastatin Calcium | Generic | 25 | 11 | $517 |
| Albuterol Sulfate Hfa (Albuterol Sulfate) | Brand | 22 | 0 | $801 |
| Gabapentin | Generic | 20 | 0 | $340 |
| Tamsulosin Hcl | Generic | 16 | 0 | $619 |
Frequently asked questions
What is Dr. Fidel Castillo Diaz's medical specialty?
Dr. Fidel Castillo Diaz practices Geriatric Medicine (Internal Medicine) Physician in Chicago, IL.
Where does Dr. Fidel Castillo Diaz practice?
Dr. Fidel Castillo Diaz practices at 840 S Wood St, Chicago, IL 606124325. Office phone: 3129967704.
What is Dr. Fidel Castillo Diaz's NPI?
Dr. Fidel Castillo Diaz's National Provider Identifier (NPI) is 1689667347, issued by NPPES.
Does Dr. Fidel Castillo Diaz accept Medicare assignment?
Yes. Dr. Fidel Castillo Diaz accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Fidel Castillo Diaz commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Insertion of needle into vein for collection of blood sample (HCPCS 36415); Hemoglobin a1c level (HCPCS 83036). Source: CMS Medicare Physician & Other Practitioners file.