Demarco Livingston, NP
Demarco Livingston, NP is a Gerontology Nurse Practitioner in Harker Heights, TX, registered under NPI 1003642661. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Harker Heights, based on OpenStreetMap data collected Oct 12, 2026. Parking is available about 0.37 mi away.
Getting here and what is nearby
Restaurant Black Bear Diner 0.23 mi ~5 min
401 Central Texas Expressway, 76548
Restaurant Rudy's Country Store and Bar-B-Q 0.32 mi ~7 min
5621 East Central Texas Expressway, Killeen 76543
Restaurant Schlotzsky's 0.36 mi ~8 min
Parking 0.37 mi ~8 min
Grocery Walmart Supercenter 0.51 mi ~11 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 1155526 | TX | Gerontology Nurse Practitioner primary |
| 1115526 | TX | Acute Care Nurse Practitioner |
This provider holds licence 1155526 issued in TX. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Nurse Practitioner
- PAC ID
- 7911439591
- Enrollment ID
- I20241021003336
Medicare enrolment is recorded as approved under the provider type Practitioner - Nurse Practitioner. 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.
What Gerontology covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LG0600X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 363LG0600X | Gerontology Nurse Practitioner Gerontology | 1155526 | TX | primary |
| 363LA2100X | Acute Care Nurse Practitioner Acute Care | 1115526 | TX |
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 | 1003642661 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 11, 2024 |
| Last updated | Oct 9, 2024 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | NP |
| Practice address |
750 W CENTRAL TEXAS EXPY Harker Heights, TX 76548 (918) 808-8400 |
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 | 0 | 0 | 3 | 6 | 4 | 2 | 6 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 3 | 4 | 4 | 6 | 3 |
Sum = 49 · next multiple of 10 = 50 · check digit = 1 · actual last digit = 1
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.