Alejandra Valentina Diaz Sierra, MD
Cardiovascular Disease Physician · Chicago, IL
Alejandra Valentina Diaz Sierra, MD is a cardiovascular disease physician with a practice address in Chicago, Illinois, and NPI 1457978512, issued on Jul 6, 2020. Check the license (Illinois 125.076003, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Alejandra Valentina Diaz Sierra
- Credential
- MD
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- 125.076003 IL
Self-reported in NPPES; status is on the state search - Practice location
- 3134 N Clark St, Chicago, IL 60657
- Phone
- (773) 880-9722
- Enumerated
- Jul 6, 2020
- Record last updated
- May 2, 2023
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 1,073 in Illinois → Look up another NPI →
Also registered at 3134 N Clark St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Fabiola Adkisson, MDInternal Medicine Physician1184474843
- Muhammad Ahmad, M.D.Internal Medicine Physician1407422629
- Reda Ahmed, MDInternal Medicine Physician1790618064
Verify Alejandra Valentina Diaz Sierra 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 125.076003Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
68 Medicare Part D claims for 27 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D.
Most prescribed
- Clopidogrel21 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.
Industry payments in 2024: $652.45
14 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 16,686 providers of this specialty with any payment received $3,819.56 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Alejandra Valentina Diaz Sierra among 1,073 cardiovascular disease physician records in Illinois
Alejandra Valentina Diaz Sierra, MD is one of 1,073 cardiovascular disease physician records with a practice address in Illinois. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 90% of them.
- NPI issued2020 · 90% of these records are older, 7% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileNo · 64% of these records are
- Record last updated2023 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in Illinois
There are 1,073 cardiovascular disease physician records in Illinois.
All 1,073 in Illinois → Every provider in Chicago → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Ajay Baddi, M.D.Chicago, IL 606571831145804
- Harry Cohen, M.D.Chicago, IL 606571821081480
- Sorin Danciu, M.D.Chicago, IL 606571003007170
- Brian Hachey, M.D.Chicago, IL 606571235578352
- Cesar Herrera, M.D.Chicago, IL 606571972550846
- Ruperto Mayuga, M.D.Chicago, IL 606571073557740
- Dragic Obradovic, MDChicago, IL 606571740367424
- Charles Ogdon, M.D.Chicago, IL 606571891142642
Common questions
What is Alejandra Valentina Diaz Sierra, MD's NPI number?
Alejandra Valentina Diaz Sierra, MD's National Provider Identifier (NPI) is 1457978512, issued on Jul 6, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Alejandra Valentina Diaz Sierra, MD located?
The NPPES record lists a practice address at 3134 N Clark St, Chicago, IL, 60657. Phone: (773) 880-9722. Providers update this record themselves, so call before visiting.
How can I verify Alejandra Valentina Diaz Sierra, MD's license?
NPPES lists Illinois license number 125.076003, 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 Alejandra Valentina Diaz Sierra, MD prescribe under Medicare Part D?
In 2024, Alejandra Valentina Diaz Sierra, MD had 68 Medicare Part D claims for 27 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 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.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.