NPPES file of Aug 9, 2026

Norman Matthew Decker, M.D.

Internal Medicine Physician · Glen Ellyn, IL

Norman Matthew Decker, M.D. is an internal medicine physician with a practice address in Glen Ellyn, Illinois, and NPI 1336534650, issued on Apr 2, 2015. Check the license (Illinois 036149373, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1336534650
Name
Norman Matthew Decker
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
036149373 IL
Self-reported in NPPES; status is on the state search
Practice location
430 Pennsylvania Ave Ste 310, Glen Ellyn, IL 60137
Phone
(630) 790-1792
Enumerated
Apr 2, 2015
Record last updated
Jul 23, 2024
Fax
(630) 545-7568
Medicare enrollment
Enrolled (PECOS I20190730001630); accepts Medicare assignment
Medical or professional school
Loyola University Of Chicago, Stritch School Of Medicine, 2015
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →

Also registered at 430 Pennsylvania Ave Ste 310

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Mohit Gupta, M.D.Internal Medicine Physician1881074441
  2. Rita Herzing, M.D.Internal Medicine Physician1316103559
  3. Winnie Nhan, DOEndocrinology, Diabetes & Metabolism Physician1245681709
  4. Ashruta Patel, MDInternal Medicine Physician1164451696

Verify Norman Matthew Decker in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
    Search for license 036149373    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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91% fewer Medicare Part D claims than the average internal medicine physician in 2024

297 Medicare Part D claims for 165 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 13 claims were for opioids.

  1. Norman Decker297
  2. Specialty average3,176

Most prescribed

  1. Cefadroxil14 claims
  2. Atorvastatin Calcium12 claims
  3. Ipratropium Bromide11 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: $23.34

1 payment: food and beverage; the largest payer was Exact Sciences Corporation. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Norman Decker$23.34
  2. Specialty average$1,303.06

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

  1. Dupage Medical Group LtdWinfield, IL

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Norman Matthew Decker among 7,238 internal medicine physician records in Illinois

Norman Matthew Decker, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 61% of them.

  • NPI issued2015 · 61% of these records are older, 37% newer
  • In a Medicare fileYes · 73% of these records are
  • In the CMS Doctors and Clinicians fileYes · 50% of these records are
  • Graduated2015 · median 2003 among the 3,580 with a school on file
  • Record last updated2024 · 47% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

18 internal medicine physician records list a practice address in Glen Ellyn

They are 18 of the 684 NPPES records with a practice address in Glen Ellyn, and 7,238 internal medicine physician records in Illinois.

All 7,238 in Illinois → Every provider in Glen Ellyn → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. John Baird, MDGlen Ellyn, IL 601371851555619
  2. Walter Briney, M.D.Glen Ellyn, IL 601371659365955
  3. Jonathan Delew, M.D.Glen Ellyn, IL 601371629060710
  4. Adelbert Duvel, MDGlen Ellyn, IL 601371275508772
  5. Stephen Gawne, MDGlen Ellyn, IL 601371497729537
  6. Rita Herzing, M.D.Glen Ellyn, IL 601371316103559
  7. Mary Kungl, M.D.Glen Ellyn, IL 601371437215076
  8. Thomas Marshall, M.D.Glen Ellyn, IL 601371043202054

Common questions

What is Norman Matthew Decker, M.D.'s NPI number?

Norman Matthew Decker, M.D.'s National Provider Identifier (NPI) is 1336534650, issued on Apr 2, 2015. An NPI identifies a provider in billing; it is not a license.

Where is Norman Matthew Decker, M.D. located?

The NPPES record lists a practice address at 430 Pennsylvania Ave Ste 310, Glen Ellyn, IL, 60137. Phone: (630) 790-1792. Providers update this record themselves, so call before visiting.

How can I verify Norman Matthew Decker, M.D.'s license?

NPPES lists Illinois license number 036149373, 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 Norman Matthew Decker, M.D. prescribe under Medicare Part D?

In 2024, Norman Matthew Decker, M.D. had 297 Medicare Part D claims for 165 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.