DR. NORMAN M. CALLAHAN (D.O.) – Gastroenterology Physician, NPI 1851367783
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,182 GASTROENTEROLOGY in PA
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Provider Addresses for DR. NORMAN M. CALLAHAN (D.O.)
PO BOX 350
SELLERSVILLE, PA 189600350
Phone: (215) 723-2333
Fax: (215) 723-9112
Type: Mailing
Central Avenue, Malvern, Chester County, Pennsylvania, 19355, United States
2ND FLOOR
MALVERN, PA 193553265
Phone: (610) 644-6755
Fax: (610) 647-2063
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 160 Open Payments records for all available years, with a total value of $3,240.
Total Amount is formed as General ($3,240) + Research ($0) + Ownership ($0) = $3,240.
Last reported payment date: 2024-12-23 • Largest payer in this snapshot: ABBVIE INC. ($769).
Total Amount
$3,240
General + Research + Ownership
Payments
160
Total payment records
General Amount
$3,240
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 |
|---|---|
| ABBVIE INC. | $769 |
| Celgene Corporation | $546 |
| Janssen Biotech, Inc. | $402 |
| Takeda Pharmaceuticals U.S.A., Inc. | $239 |
| Madrigal Pharmaceuticals | $141 |
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: 2010-04-27
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 |
|---|---|---|---|---|
| I20100427000074 | I | Gastroenterology | PA | 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 |
|---|---|---|---|---|
| J3380 | Injection, vedolizumab, 1 mg | 5,701 | 15 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 165 | 165 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 162 | 141 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 127 | 104 | $0 |
| 45380 | Biopsy of large bowel using a flexible endoscope | 105 | 105 | $0 |
Insurance plans in this area (ZIP 18960)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| G A S T R O E N T E R O L O G Y | PA | |
| 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 | PA | |
| G A S T R O E N T E R O L O G Y | PA | |
| G A S T R O E N T E R O L O G Y | PA | |
| - | PA | |
| Physician Assistant | MD | |
| G A S T R O E N T E R O L O G Y | PA | |
| G A S T R O E N T E R O L O G Y | PA | |
| Physician Assistant | PA |
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