Niluardo Cay, M.D.
Internal Medicine Physician · Chicago, IL
Niluardo Cay, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1588766646, issued on Sep 1, 2006. Check the license (Illinois 036056545, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Niluardo Cay
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036056545 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1431 N Western Ave, Chicago, IL 60622
- Phone
- (773) 235-5391
- Enumerated
- Sep 1, 2006
- Entity
- Type 1 · individual
Also registered at 1431 N Western Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marianne Butler, APNFamily Nurse Practitioner1518228915
- Adalberto Campo, MDInternal Medicine Physician1902961006
- Teresa Castellanos, LCSWClinical Social Worker1821386442
- Talia DitkoffStudent in an Organized Health Care Education/Training Program1740077445
- Manuel Dominguez, M.D.Family Medicine Physician1437205671
- Manuel Franco, MDFamily Medicine Physician1083671341
Verify Niluardo Cay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036056545Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
50% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,401 Medicare Part D claims for 105 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Atorvastatin Calcium135 claims
- Amlodipine Besylate120 claims
- Metoprolol Succinate97 claims
- Lisinopril61 claims
- Metformin Hcl60 claims
- Hydrochlorothiazide42 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
3,291 internal medicine physician records list a Chicago practice address
They are 3,291 of the 63,379 NPPES records with a Chicago practice address, and 8,522 internal medicine physician records in Illinois.
All 3,291 in Chicago → All 8,522 in Illinois → Every provider in Chicago →
Other internal medicine physician records in Illinois
- Peter Abadeer, D.O.Bloomington, IL1760469522
- Pamela Abadi, D.O.Winfield, IL1588820179
- Motaz Abas, MDPeoria, IL1215510201
- Elias Abate, M.D.Chicago, IL1336712199
- Maliha Abbas, D.O.Chicago, IL1174963920
- Zareena Abbas, MDChicago, IL1427078872
- Abu Abbasi, MDChicago, IL1083243877
- Ayesha Abbasi, MDChicago, IL1376216705
- Khalda Abbasi, MDNaperville, IL1487705240
- Misha Abbasi, MDChicago, IL1770111635
Common questions
What is Niluardo Cay, M.D.'s NPI number?
Niluardo Cay, M.D.'s National Provider Identifier (NPI) is 1588766646, issued on Sep 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Niluardo Cay, M.D. located?
The NPPES record lists a practice address at 1431 N Western Ave, Chicago, IL, 60622. Phone: (773) 235-5391. Providers update this record themselves, so call before visiting.
How can I verify Niluardo Cay, M.D.'s license?
NPPES lists Illinois license number 036056545, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Niluardo Cay, M.D. prescribe under Medicare Part D?
In 2024, Niluardo Cay, M.D. had 1,401 Medicare Part D claims for 105 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.