William N. Barker JR., ACNP
Nurse Practitioners (Acute Care Nurse Practitioner)
- Medicare participating
At a glance
- Years since graduation
- 18
- In the NPI registry since
- 2008
- Medicare patients seen, 2024
- 242
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2008Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Acute Care Nurse Practitioner primary
TX license AP117340
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Christus Good Shepherd Medical Center Longview, TX
Medical groups
- Christus Trinity Clinic Texas (1,540 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 242
- Services billed
- 628
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 438 | 272 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 42 | 41 |
| Established patient office or other outpatient visit, 20-29 minutes | 28 | 28 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Entresto (sacubitril/valsartan) Other prescribers in Longview, TX | 421 |
| Furosemide Other prescribers in Longview, TX | 296 |
| Metoprolol Succinate Other prescribers in Longview, TX | 233 |
| Eliquis (apixaban) Other prescribers in Longview, TX | 200 |
| Carvedilol Other prescribers in Longview, TX | 192 |
| Atorvastatin Calcium Other prescribers in Longview, TX | 149 |
| Lisinopril Other prescribers in Longview, TX | 138 |
| Spironolactone Other prescribers in Longview, TX | 131 |
| Clopidogrel (clopidogrel bisulfate) Other prescribers in Longview, TX | 131 |
| Potassium Chloride Other prescribers in Longview, TX | 130 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 3 companies reported 7 payments worth $314 in total to this clinician.
| Zoll Services LLC (a/k/a Zoll Lifecor Corp) | $120 |
|---|---|
| Abbott Laboratories | $102 |
| Novartis Pharmaceuticals Corporation | $91.36 |
| Food and Beverage | $314 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.