Demetrios Spyridon Theodoropoulos, M.D.
Clinical & Laboratory Immunology (Allergy & Immunology) Physician · Onalaska, WI
Demetrios Spyridon Theodoropoulos, M.D. is a clinical & laboratory immunology (allergy & immunology) physician with a practice address in Onalaska, Wisconsin, and NPI 1326299488, issued on Oct 8, 2008. Check the license (Wisconsin 44060-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Demetrios Spyridon Theodoropoulos
- Credential
- M.D.
- Primary taxonomy
- Clinical & Laboratory Immunology (Allergy & Immunology) Physician 207KI0005X
- License number
- 44060-20 WI
Self-reported in NPPES; status is on the state search - Practice location
- 2727 Midwest Drive, Onalaska, WI 54650
- Phone
- (608) 782-2027
- Enumerated
- Oct 8, 2008
- Record last updated
- Dec 14, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (608) 782-6172
- Medicare enrollment
- Enrolled (PECOS I20050922001172); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
1 nearest clinical & laboratory immunology (allergy & immunology) physician record → All 2 in Wisconsin → Look up another NPI →
Verify Demetrios Spyridon Theodoropoulos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 44060-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average clinical & laboratory immunology (allergy & immunology) physician in 2024
591 Medicare Part D claims for 159 beneficiaries, against an average of 678 among the 35 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims.
Most prescribed
- Montelukast Sodium53 claims
- Arnuity Ellipta52 claims
- Fluticasone-Salmeterol38 claims
- Fluconazole36 claims
- Albuterol Sulfate Hfa27 claims
- Azithromycin27 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: $1,048.81
33 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 33 providers of this specialty with any payment received $3,436.23 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
- Allergy Associates Holdings, LtdOnalaska, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clinical & Laboratory Immunology (Allergy & Immunology) Physician providers in Wisconsin
There are 2 clinical & laboratory immunology (allergy & immunology) physician records in Wisconsin.
All 2 in Wisconsin → Every provider in Onalaska → Clinical & Laboratory Immunology (Allergy & Immunology) Physician nationwide →
The 1 clinical & laboratory immunology (allergy & immunology) physician record with the nearest ZIP codes
- Walter Brummund, M.D.,PHDWauwatosa, WI 532261487708988
Common questions
What is Demetrios Spyridon Theodoropoulos, M.D.'s NPI number?
Demetrios Spyridon Theodoropoulos, M.D.'s National Provider Identifier (NPI) is 1326299488, issued on Oct 8, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Demetrios Spyridon Theodoropoulos, M.D. located?
The NPPES record lists a practice address at 2727 Midwest Drive, Onalaska, WI, 54650. Phone: (608) 782-2027. Providers update this record themselves, so call before visiting.
How can I verify Demetrios Spyridon Theodoropoulos, M.D.'s license?
NPPES lists Wisconsin license number 44060-20, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Demetrios Spyridon Theodoropoulos, M.D. prescribe under Medicare Part D?
In 2024, Demetrios Spyridon Theodoropoulos, M.D. had 591 Medicare Part D claims for 159 beneficiaries; the average among clinical & laboratory immunology (allergy & immunology) physician prescribers was 678. 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.