Fidel Castillo DiazMD
Internal Medicine, Geriatric Medicine
2027 Medicare Advantage
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Medicare Advantage plans for Cook County, IL.
Use the name or plan ID on your member card, or choose your insurance company.
Directory results See what each insurance company reports
The 64 Medicare Advantage plans we show for Cook County, IL in 2027
- 19 list Fidel
- 45 not listed
Aetna Medicare · Aetna Medicare FIDE
8 plans list Fidel; not listed on 1 other plan.
Aetna Medicare Eagle (PPO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthAetna Medicare Prime (HMO-POS)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthAetna Medicare Prime Extra Care (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthAetna Medicare Signature (HMO-POS)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a month
Wellcare
6 plans list Fidel.
Wellcare Giveback (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthWellcare Simple (HMO-POS)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthWellcare Simple Essential (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthWellcare Simple Exclusive (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a month
Zing Health
4 plans list Fidel; not listed on 3 other plans.
Zing Select Care IL (HMO)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1801 W Taylor St, Chicago, IL, 60612
- 1740 W Taylor St, Chicago, IL, 60612
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthZing Select Diabetes & Heart Complete IL (HMO C-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1801 W Taylor St, Chicago, IL, 60612
- 1740 W Taylor St, Chicago, IL, 60612
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthZing Select Diabetes & Heart IL (HMO C-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1801 W Taylor St, Chicago, IL, 60612
- 1740 W Taylor St, Chicago, IL, 60612
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a monthZing Select Dialysis IL (HMO C-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1801 W Taylor St, Chicago, IL, 60612
- 1740 W Taylor St, Chicago, IL, 60612
- 2600 S Michigan Ave, Chicago, IL, 60616
This result applies to these offices. Other locations are not confirmed.
$0a month
Molina Healthcare of Illinois
1 plan lists Fidel.
Molina Medicare Complete Care Plus (HMO D-SNP)
Source: Medicare.gov provider data.
Listed offices for this plan:
- 1801 W Taylor St, Chicago, IL, 60612
This result applies to these offices. Other locations are not confirmed.
$0a month
Blue Cross and Blue Shield of IL, NM
Not listed on its 1 plan here. That isn't proof they're out of network.
Devoted
Not listed on its 8 plans here. That isn't proof they're out of network.
Essence Healthcare
Not listed on its 4 plans here. That isn't proof they're out of network.
HealthSpring
Not listed on its 5 plans here. That isn't proof they're out of network.
Humana
Not listed on its 13 plans here. That isn't proof they're out of network.
UnitedHealthcare
Not listed on its 10 plans here. That isn't proof they're out of network.
Premiums are each plan's own monthly premium, as filed with Medicare. You keep paying your Medicare Part B premium.
Can't find your plan?Tell us the plan you have, and a licensed Silverpath advisor will check whether Fidel takes it. Free.
Original Medicare
Original Medicare status
Most Medicare Supplement (Medigap) policies have no provider network: they help pay Original Medicare's cost sharing where Medicare is accepted. Medicare SELECT policies can require network providers for full benefits. Ask the office whether they accept Medicare.
Medicare enrollment and assignment have not been verified here. Advantage directory results do not answer this question.
No opt-out record in this CMS file. CMS's file covers data through 2026-08-31. This does not establish Medicare enrollment, assignment, or whether the office accepts new Medicare patients.
CMS opt-out source · Data through 2026-08-31 · Reviewed Oct 25, 2026
Where they practice
Practice location
- NPI issued
- 2005
- Registry record updated
- Mar 5, 2014
Medicare's clinician details aren't available on this page yet.
Questions
Common questions
Which 2027 Medicare Advantage plans list Fidel Castillo Diaz?
In Cook County, IL, 19 Medicare Advantage plans for 2027 list Fidel in provider data from Medicare.gov or the carrier, including Aetna Medicare Eagle (PPO), Aetna Medicare Prime (HMO-POS) and Aetna Medicare Prime Extra Care (HMO). CMS matches apply to the covered offices shown with each plan; other offices are not confirmed. Networks can change during the year, so confirm with the office or the plan before you enroll.
Does Fidel Castillo Diaz take Aetna Medicare Medicare Advantage plans?
Medicare.gov provider data lists Fidel on 8 Medicare Advantage plans for 2027 in Cook County, IL, including Aetna Medicare Eagle (PPO) and Aetna Medicare Prime (HMO-POS). 1 other plan did not return a listing in the search area. CMS matches apply to the covered offices shown with each plan; other offices are not confirmed. Confirm with the office or Aetna Medicare before you enroll.
Does Fidel Castillo Diaz take Wellcare Medicare Advantage plans?
Medicare.gov provider data lists Fidel on 6 Medicare Advantage plans for 2027 in Cook County, IL, including Wellcare Giveback (HMO) and Wellcare Simple (HMO-POS). CMS matches apply to the covered offices shown with each plan; other offices are not confirmed. Confirm with the office or Wellcare before you enroll.
Does Fidel Castillo Diaz take Zing Health Medicare Advantage plans?
Medicare.gov provider data lists Fidel on 4 Medicare Advantage plans for 2027 in Cook County, IL, including Zing Select Care IL (HMO) and Zing Select Diabetes & Heart Complete IL (HMO C-SNP). 3 other plans did not return a listing in the search area. CMS matches apply to the covered offices shown with each plan; other offices are not confirmed. Confirm with the office or Zing Health before you enroll.
Where does Fidel Castillo Diaz practice?
840 S Wood St, M-C 717 Csn 440, Chicago, IL 60612.
How do I confirm Fidel is in my plan's network?
Call the member services number on your plan card and give them the NPI 1689667347, or ask a Silverpath advisor to check for you. It's free.
For providers
Is this your practice?
What patients see here today:
- Provider searches did not return a listing for Fidel Castillo Diaz on 41 plans from Blue Cross and Blue Shield of IL, NM, Devoted, Essence Healthcare, HealthSpring, Humana and UnitedHealthcare in Cook County, IL. Other offices are not confirmed; this isn't proof the practice is out of network.
Tell us which plans you take, or want to take, and we'll keep this page accurate and talk with you about reaching more Medicare patients and carriers.