DR. ROCKFORD GLENN YAPP (M.D., M.P.H.) – Gastroenterology Physician, NPI 1356327910
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
978 GASTROENTEROLOGY in IL
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Provider Addresses for DR. ROCKFORD GLENN YAPP (M.D., M.P.H.)
3825, Highland Avenue, Downers Grove, DuPage County, Illinois, 60515, United States
TOWER 2 - SUITE 302
DOWNERS GROVE, IL 605151552
Phone: (630) 434-9312
Fax: (630) 434-9360
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 420 Open Payments records for all available years, with a total value of $116,176.
Total Amount is formed as General ($116,176) + Research ($0) + Ownership ($0) = $116,176.
Last reported payment date: 2024-12-23 • Largest payer in this snapshot: Phathom Pharmaceuticals, Inc. ($34,340).
Total Amount
$116,176
General + Research + Ownership
Payments
420
Total payment records
General Amount
$116,176
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-23
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Phathom Pharmaceuticals, Inc. | $34,340 |
| Gilead Sciences, Inc. | $23,733 |
| Madrigal Pharmaceuticals | $21,110 |
| ABBVIE INC. | $11,999 |
| Exact Sciences Corporation | $11,265 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-04-09
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040409000100 | I | Gastroenterology | IL | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 372 | 264 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 296 | 129 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 159 | 150 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 110 | 90 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 84 | 83 | $0 |
Insurance plans in this area (ZIP 60515)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| Gastroenterology, Internal Medicine | IL | |
| G A S T R O E N T E R O L O G Y | IL | |
| G A S T R O E N T E R O L O G Y | IL | |
| - | IL | |
| Gastroenterology, Internal Medicine | CA | |
| Gastroenterology, Internal Medicine | IL | |
| G A S T R O E N T E R O L O G Y | IL | |
| Nurse Practitioner | IL | |
| Physician Assistant | IL | |
| Gastroenterology, Internal Medicine | IL |
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