NPPES file of Aug 9, 2026

Rockford Glenn Yapp, M.D., M.P.H.

Gastroenterology Physician · Downers Grove, IL

Rockford Glenn Yapp, M.D., M.P.H. is a gastroenterology physician with a practice address in Downers Grove, Illinois, and NPI 1356327910, issued on Dec 15, 2005. Check the license 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
1356327910
Name
Rockford Glenn Yapp
Credential
M.D., M.P.H.
Primary taxonomy
Gastroenterology Physician 207RG0100X
Practice location
3825 Highland Ave, Downers Grove, IL 60515
Phone
(630) 434-9312
Enumerated
Dec 15, 2005
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(630) 434-9360
Medicaid ID
036-72055 IL
Medicare enrollment
Enrolled (PECOS I20040409000100); accepts Medicare assignment
Medical or professional school
University Of Nebraska College Of Medicine, 1984
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 gastroenterology physician records → All 887 in Illinois → Look up another NPI →

Also registered at 3825 Highland Ave

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

  1. Mani Akkineni, M.D.Specialist1467456186
  2. Medha Amin, MDObstetrics Physician1912197534
  3. Teresita Avila, M.D.Specialist1386649317
  4. Lara Bakhos, M.D.Cardiovascular Disease Physician1730336652
  5. Jennifer Balash, M.D.Obstetrics & Gynecology Physician1487881025
  6. Shamita Bansore, MDObstetrics & Gynecology Physician1700813771

Verify Rockford Glenn Yapp in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck 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

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84% more Medicare Part D claims than the average gastroenterology physician in 2024

1,490 Medicare Part D claims for 492 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.

  1. Rockford Yapp1,490
  2. Specialty average811

Most prescribed

  1. Omeprazole522 claims
  2. Sod Sulf-Potass Sulf-Mag Sulf135 claims
  3. Pantoprazole Sodium84 claims
  4. Esomeprazole Magnesium78 claims
  5. Linzess58 claims
  6. Mesalamine50 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: $85,173.71

233 payments; by number, the most common kind was food and beverage; the largest payer was Phathom Pharmaceuticals, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Rockford Yapp$85,174
  2. Specialty average$5,016

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. GI Partners OF Illinois LLCLibertyville, IL

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

Rockford Glenn Yapp among 887 gastroenterology physician records in Illinois

Rockford Glenn Yapp, M.D., M.P.H. is one of 887 gastroenterology 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 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 85% newer
  • In a Medicare fileYes · 85% of these records are
  • In the CMS Doctors and Clinicians fileYes · 72% of these records are
  • Graduated1984 · median 2003 among the 643 with a school on file
  • Record last updated2007 · 49% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Gastroenterology Physician providers in Illinois

There are 887 gastroenterology physician records in Illinois.

All 887 in Illinois → Every provider in Downers Grove → Gastroenterology Physician nationwide →

The 8 gastroenterology physician records with the nearest ZIP codes

  1. Anshuman Chawla, M.D.Downers Grove, IL 605151841276417
  2. James Clark, M.D.Downers Grove, IL 605151588640650
  3. David Gerard, M.D.Downers Grove, IL 605151942312210
  4. John Holden, MDDowners Grove, IL 605151356341846
  5. Manfred Raiser, M.D.Downers Grove, IL 605151306958665
  6. Laura Hamad, DOWoodridge, IL 605171699186890
  7. Carl CalandraHinsdale, IL 605211366527418
  8. Suman Kaur, MDHinsdale, IL 605211184624678

Common questions

What is Rockford Glenn Yapp, M.D., M.P.H.'s NPI number?

Rockford Glenn Yapp, M.D., M.P.H.'s National Provider Identifier (NPI) is 1356327910, issued on Dec 15, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Rockford Glenn Yapp, M.D., M.P.H. located?

The NPPES record lists a practice address at 3825 Highland Ave, Downers Grove, IL, 60515. Phone: (630) 434-9312. Providers update this record themselves, so call before visiting.

How can I verify Rockford Glenn Yapp, M.D., M.P.H.'s license?

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 Rockford Glenn Yapp, M.D., M.P.H. prescribe under Medicare Part D?

In 2024, Rockford Glenn Yapp, M.D., M.P.H. had 1,490 Medicare Part D claims for 492 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.