William Spears, MD
William Spears, MD is a Neurocritical Care Physician in Greenville, SC, registered under NPI 1780187567. 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 200 PATEWOOD DRIVE STE B350, Greenville, SC 29615. 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 |
|---|---|---|
| 91854 | SC | Neurocritical Care Physician primary |
| 91854 | SC | Neurology Physician |
| MD487515 | PA | Neurology Physician |
| 2025-00294 | NC | Neurocritical Care Physician |
Licences are recorded in 3 states: SC, PA, NC. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Neurology
- PAC ID
- 3072861913
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| South Carolina | I20240728000045 | Practitioner - Neurology |
| North Carolina | I20250224002585 | Practitioner - Neurology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Neurology. There are 2 separate enrolment records across 2 states (SC, NC). 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, Pennsylvania and South Carolina. The practice address on file is in Greenville, SC, 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
- 2025-00294
- Specialty
- Neurocritical Care Physician
- Licence
- 91854
- Specialty
- Neurocritical Care 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 Neurocritical Care covers
The medical subspecialty of Neurocritical Care is devoted to the comprehensive, multisystem care of the critically-ill neurological patient. Like other intensivists, the neurointensivist generally assumes the primary role for coordinating the care of his or her patients in the ICU, both the neurological and medical management of the patient. They may also provide consultative services for these patients as requested within the health system. NUCC Health Care Provider Taxonomy, code 2084A2900X
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 | |
|---|---|---|---|---|
| 2084A2900X | Neurocritical Care Physician Neurocritical Care | 91854 | SC | primary |
| 2084N0400X | Neurology Physician Neurology | 91854 | SC | |
| 2084N0400X | Neurology Physician Neurology | MD487515 | PA | |
| 2084A2900X | Neurocritical Care Physician Neurocritical Care | 2025-00294 | NC |
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 | 1780187567 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 17, 2018 |
| Last updated | Mar 13, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
200 PATEWOOD DRIVE STE B350 Greenville, SC 29615 (864) 454-4500 |
| Mailing address |
300 E MCBEE AVE FL 4 Greenville, SC 29601 |
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 | 8 | 0 | 1 | 8 | 7 | 5 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 7 | 0 | 2 | 8 | 5 | 5 | 3 |
Sum = 63 · next multiple of 10 = 70 · check digit = 7 · actual last digit = 7
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.