GREGOR SIEBERT (P.A.) – Medical Physician Assistant, NPI 1700873510
Medical Physician Assistant
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Profile Insights
NPPES metrics only — not quality of care.
4,430 PHYSICIAN ASSISTANT in VA
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Provider Addresses for GREGOR SIEBERT (P.A.)
5000 COX RD
SUITE 100
GLEN ALLEN, VA 230609263
Phone: (804) 968-5700
Fax: (804) 217-7991
Type: Mailing
Richmond Highway, Jefferson Houston, Alexandria, Virginia, 22301, United States
ALEXANDRIA, VA 223066410
Phone: (703) 647-6087
Fax: (703) 647-6088
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: 2014-12-22
PECOS data refreshed: 2026-05-27
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 |
|---|---|---|---|---|
| I20140926001455 | I | Physician Assistant | DC | TBD |
| I20141222002696 | I | Physician Assistant | VA | 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 | 22 | 22 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 21 | 21 | $0 |
| 87880 | Detection test by immunoassay with direct visual observation for streptococcus, group a (strep) | 15 | 15 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 14 | 14 | $0 |
| 87428 | Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus and influenza | 12 | 12 | $0 |
Insurance plans in this area (ZIP 23060)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | VA | |
| - | VA | |
| - | VA | |
| Family Practice | VA | |
| Physician Assistant | VA | |
| Family Practice | VA | |
| Family Practice | VA | |
| Family Practice | VA | |
| Internal Medicine | VA | |
| Physician Assistant | DC |
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