Mark Sewell, M.D.
Mark Sewell, M.D. is a Maternal & Fetal Medicine Physician in Alexandria, VA, registered under NPI 1912913880. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 4320 SEMINARY RD, Alexandria, VA 22304. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 2011-1303 | NC | Maternal & Fetal Medicine Physician primary |
| 0101229824 | VA | Obstetrics & Gynecology Physician |
| 35083035S | OH | Maternal & Fetal Medicine Physician |
| 0101229824 | VA | Maternal & Fetal Medicine Physician |
Licences are recorded in 3 states: NC, VA, OH. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Obstetrics/gynecology
- PAC ID
- 8224265558
Enrolled in Medicare 3 times, across 3 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| North Carolina | I20131212000915 | Practitioner - Obstetrics/gynecology |
| District of Columbia | I20190509002840 | Practitioner - Obstetrics/gynecology |
| Virginia | I20190515002413 | Practitioner - Obstetrics/gynecology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Obstetrics/gynecology. There are 3 separate enrolment records across 3 states (NC, DC, VA). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 3 states
This provider holds licences in 3 states: North Carolina, Ohio and Virginia. The practice address on file is in Alexandria, VA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 2011-1303
- Specialty
- Maternal & Fetal Medicine Physician
- Licence
- 0101229824
- Specialty
- Obstetrics & Gynecology Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Maternal & Fetal Medicine covers
An obstetrician/gynecologist who cares for, or provides consultation on, patients with complications of pregnancy. This specialist has advanced knowledge of the obstetrical, medical and surgical complications of pregnancy and their effect on both the mother and the fetus. The specialist also possesses expertise in the most current diagnostic and treatment modalities used in the care of patients with complicated pregnancies. NUCC Health Care Provider Taxonomy, code 207VM0101X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207VM0101X | Maternal & Fetal Medicine Physician Maternal & Fetal Medicine | 2011-1303 | NC | primary |
| 207V00000X | Obstetrics & Gynecology Physician | 0101229824 | VA | |
| 207VM0101X | Maternal & Fetal Medicine Physician Maternal & Fetal Medicine | 35083035S | OH | |
| 207VM0101X | Maternal & Fetal Medicine Physician Maternal & Fetal Medicine | 0101229824 | VA |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1912913880 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 31, 2006 |
| Last updated | Jul 20, 2021 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
4320 SEMINARY RD Alexandria, VA 22304 (703) 504-3000 Fax (703) 504-3388 |
| Mailing address |
PO BOX 37174 Baltimore, MD 21297 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 9 | 1 | 2 | 9 | 1 | 3 | 8 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 2 | 2 | 9 | 1 | 6 | 8 | 7 |
Sum = 70 · next multiple of 10 = 70 · check digit = 0 · actual last digit = 0
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.