MR. WILLIAM J BARKER (MD) – Emergency Medical Services (Emergency Medicine) Physician, NPI 1770599847
Emergency Medical Services (Emergency Medicine) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
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Provider Addresses for MR. WILLIAM J BARKER (MD)
PO BOX 223323
CHANTILLY, VA 201533323
Phone: (540) 349-0595
Type: Mailing
Fauquier Hospital, 500, Hospital Drive, Warrenton, Fauquier County, Virginia, 20186, United States
WARRENTON, VA 201863027
Phone: (540) 349-0595
Fax: (540) 349-0587
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: 2007-09-12
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Past revalidation due date
Earliest CMS due date was 2023-07-31 (1044 days ago).
Enrollment records
2
Earliest due date
2023-07-31
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 |
|---|---|---|---|---|
| I20040507000639 | I | Emergency Medicine | DC | TBD |
| I20070912000221 | I | Emergency Medicine | VA | 2023-07-31 |
What to do next
- Verify current status on the CMS Revalidation Lookup Tool immediately.
- Complete revalidation in PECOS or contact your Medicare Administrative Contractor (MAC).
- Overdue revalidation can lead to deactivation of Medicare billing privileges.
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 |
|---|---|---|---|---|
| 99284 | Emergency department visit with moderate level of medical decision making | 95 | 92 | $0 |
| 99285 | Emergency department visit with high level of medical decision making | 52 | 51 | $0 |
| 99291 | Critical care, first 30-74 minutes | 47 | 47 | $0 |
| 99283 | Emergency department visit with low level of medical decision making | 13 | 12 | $0 |
Insurance plans in this area (ZIP 20153)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Emergency Medicine | VA | |
| Emergency Medicine | MD | |
| - | VA | |
| Emergency Medicine | VA | |
| - | MD | |
| Emergency Medicine | VA | |
| - | VA | |
| Emergency Medicine | MD | |
| Emergency Medicine | VA | |
| Emergency Medicine | VA |
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