Vivian Hsun-Chien Chou, MD
Allergy & Immunology Physician · Evanston, IL
Vivian Hsun-Chien Chou, MD is an allergy & immunology physician with a practice address in Evanston, Illinois, and NPI 1457573420, issued on May 2, 2007. Check the license (Illinois 036114020, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Vivian Hsun-Chien Chou
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- 036114020 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Ridge Ave, Evanston, IL 60201
- Phone
- (847) 328-7909
- Enumerated
- May 2, 2007
- Record last updated
- Dec 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (847) 328-7919
- Medicare enrollment
- Enrolled (PECOS I20070921000572); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 2002
- Entity
- Type 1 · individual
Also registered at 2500 Ridge Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Vivian Hsun-Chien Chou 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 036114020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
342 Medicare Part D claims for 55 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Montelukast Sodium59 claims
- Azelastine Hcl47 claims
- Fluticasone Propionate46 claims
- Hydroxyzine Hcl28 claims
- Cromolyn Sodium16 claims
- Epinephrine14 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: $2,241.57
93 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 2,496 providers of this specialty with any payment received $8,321.81 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.
Bills Medicare through one group practice
- Illinois Allergy And Asthma Specialists SCChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Allergy & Immunology Physician providers in Illinois
There are 162 allergy & immunology physician records in Illinois.
Other allergy & immunology physician records in Illinois
- Arabelle Abellard, MDPeoria, IL1245729805
- Daryn Abraham, M.D.St Charles, IL1104975770
- Justine Ade, MDUrbana, IL1457707010
- Afia Adu-Gyamfi, MDChicago, IL1245961309
- Ingrid Alexander, MDSpringfield, IL1144269531
- Hetal Amin, MDChannahon, IL1184665424
- Evelyn Angulo, M.D.Glenview, IL1184967770
- Susan Apolinario, M.D.Oak Lawn, IL1174522171
- Noga Askenazi, MDCrystal Lake, IL1972518702
- Sakina Bajowala, M.D.North Aurora, IL1427259605
Common questions
What is Vivian Hsun-Chien Chou, MD's NPI number?
Vivian Hsun-Chien Chou, MD's National Provider Identifier (NPI) is 1457573420, issued on May 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Vivian Hsun-Chien Chou, MD located?
The NPPES record lists a practice address at 2500 Ridge Ave, Evanston, IL, 60201. Phone: (847) 328-7909. Providers update this record themselves, so call before visiting.
How can I verify Vivian Hsun-Chien Chou, MD's license?
NPPES lists Illinois license number 036114020, 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 Vivian Hsun-Chien Chou, MD prescribe under Medicare Part D?
In 2024, Vivian Hsun-Chien Chou, MD had 342 Medicare Part D claims for 55 beneficiaries; the average among allergy & immunology physician prescribers was 741. 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.