Dr. Fidel Castillo Diaz MD
Also known as
- Professional nameCastillo, Fidel E
Source: NPPES public registry.
About this NPIWhat this record shows.
NPI 1689667347 is registered to Dr. Fidel Castillo Diaz MD, a Geriatric Medicine (Internal Medicine) Physician practising at 840 S Wood St, M-C 717 Csn 440 in Chicago, Illinois. Geriatric Medicine (Internal Medicine) Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy. Dr. Fidel Castillo Diaz MD has been enumerated in the National Provider Identifier (NPI) registry since 2005.
Your brand here.
Medicare enrollment
This provider holds a Medicare enrollment on file with the Provider Enrollment, Chain and Ownership System (PECOS). Each enrollment carries a public Medicare Enrollment ID (ENRLMT_ID) used by billers and intermediaries.
Practitioner
- I20101202000876Geriatric MedicineIL
Source: CMS PECOS public enrollment file.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Dr. Fidel Castillo Diaz MD accepts. To confirm in-network status with your specific health plan, contact Dr. Fidel Castillo Diaz MD directly at (312) 996-7704.
Frequently asked
Yes. NPI 1689667347 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Geriatric Medicine (Internal Medicine) Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (312) 996-7704.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Dr. Fidel Castillo Diaz MD is a Type-1 individual NPI.