STEPHEN J ANTONIK (MD) – Gastroenterology Physician, NPI 1770567257
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
541 GASTROENTEROLOGY in VA
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Provider Addresses for STEPHEN J ANTONIK (MD)
Leesburg-Sterling Family Practice, 224D, Cornwall Street Northwest, Leesburg, Loudoun County, Virginia, 20176, United States
SUITE 207
LEESBURG, VA 201762700
Phone: (703) 771-9001
Fax: (703) 771-9076
Type: Mailing
19500 SANDRIDGE WAY STE 470
LEESBURG, VA 201763694
Phone: (703) 771-9001
Fax: (703) 771-9076
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
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: 2025-09-09
PECOS data refreshed: 2026-06-15
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20090729000494 | I | Gastroenterology | VA | TBD |
| I20250909004235 | I | Gastroenterology | DC | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 95 | 81 | $0 |
| 45380 | Biopsy of large bowel using a flexible endoscope | 92 | 91 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 81 | 70 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 61 | 60 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 22 | 21 | $0 |
Insurance plans in this area (ZIP 20176)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | VA | 45385 | Removal of polyps or growths of large bowel using an endoscope | 31 | 31 |
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