Gregory Nelson, D.O.
Gregory Nelson, D.O. is an Anesthesiology Physician in Randallstown, MD, registered under NPI 1750536520.
Getting there
The practice address on file is 5401 OLD COURT RD, Randallstown, MD 21133. 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 |
|---|---|---|
| A-1484-08 | NM | Anesthesiology Physician |
| 0102204696 | VA | Anesthesiology Physician |
| OS11380 | FL | Anesthesiology Physician |
| H74967 | MD | Anesthesiology Physician |
| 60 264743 | NY | Anesthesiology Physician |
| 20A10561 | CA | Anesthesiology Physician |
| OS021930 | PA | Anesthesiology Physician primary |
| 66537 | GA | Anesthesiology Physician |
Licences are recorded in 8 states: NM, VA, FL, MD, NY, CA, PA, GA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Anesthesiology
- PAC ID
- 9133285778
Enrolled in Medicare 6 times, across 6 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Maryland | I20121130000018 | Practitioner - Anesthesiology |
| Virginia | I20161130001381 | Practitioner - Anesthesiology |
| California | I20190814004219 | Practitioner - Anesthesiology |
| Delaware | I20240418002824 | Practitioner - Anesthesiology |
| New York | I20250304002762 | Practitioner - Anesthesiology |
| Pennsylvania | I20250728001301 | Practitioner - Anesthesiology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Anesthesiology. There are 6 separate enrolment records across 6 states (MD, VA, CA, DE, NY, PA). 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 8 states
This provider holds licences in 8 states: California, Florida, Georgia, Maryland, New Mexico, New York, Pennsylvania and Virginia. The practice address on file is in Randallstown, MD, 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
- H74967
- Specialty
- Anesthesiology 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 Anesthesiology covers
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery. NUCC Health Care Provider Taxonomy, code 207L00000X
All registered taxonomy codes
This provider registers 8 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207L00000X | Anesthesiology Physician | A-1484-08 | NM | |
| 207L00000X | Anesthesiology Physician | 0102204696 | VA | |
| 207L00000X | Anesthesiology Physician | OS11380 | FL | |
| 207L00000X | Anesthesiology Physician | H74967 | MD | |
| 207L00000X | Anesthesiology Physician | 60 264743 | NY | |
| 207L00000X | Anesthesiology Physician | 20A10561 | CA | |
| 207L00000X | Anesthesiology Physician | OS021930 | PA | primary |
| 207L00000X | Anesthesiology Physician | 66537 | GA |
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 | 1750536520 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 20, 2008 |
| Last updated | Jan 23, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | D.O. |
| Practice address |
5401 OLD COURT RD Randallstown, MD 21133 (410) 521-2200 |
| Mailing address |
11781 LEE JACKSON MEMORIAL HWY SUITE 550 Fairfax, VA 22033 |
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 | 7 | 5 | 0 | 5 | 3 | 6 | 5 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 1 | 0 | 1 | 3 | 3 | 5 | 4 |
Sum = 50 · next multiple of 10 = 50 · 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.