RONALD P MARKOS (MD) – Gastroenterology Physician, NPI 1851399786
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 RONALD P MARKOS (MD)
817, Lawn Avenue, West Rockhill, Bucks County, Pennsylvania, 18960, United States
SELLERSVILLE, PA 189601549
Phone: (215) 257-5071
Fax: (215) 257-1801
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 106 Open Payments records for all available years, with a total value of $1,861.
Total Amount is formed as General ($1,861) + Research ($0) + Ownership ($0) = $1,861.
Last reported payment date: 2024-12-21 • Largest payer in this snapshot: ABBVIE INC. ($686).
Total Amount
$1,861
General + Research + Ownership
Payments
106
Total payment records
General Amount
$1,861
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-21
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $686 |
| Celgene Corporation | $161 |
| Janssen Biotech, Inc. | $149 |
| Takeda Pharmaceuticals U.S.A., Inc. | $144 |
| Phathom Pharmaceuticals, Inc. | $51 |
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: 2010-09-10
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 |
|---|---|---|---|---|
| I20100910000140 | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 381 | 331 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 246 | 244 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 176 | 162 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 169 | 155 | $0 |
| 46221 | Removal of external hemorrhoids by rubber banding | 127 | 68 | $0 |
Insurance plans in this area (ZIP 18960)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | PA | 45378 | Diagnostic examination of large bowel using an endoscope | 62 | 57 |
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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