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Dr. William D. Andersen, M.D.

Anesthesiology (Anesthesiology Physician)

  • Medicare participating

At a glance

Years since graduation
15
In the NPI registry since
2011
Medicare patients seen, 2024
258

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. What an NPI is

Education and training

  • 2011Medical school: University of South Carolina School of Medicine
  • 2011Registered with an NPI (national billing number; not a license date)

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

  • Anesthesiology Physician primary
    NC license 173601

As reported to the NPI registry. To confirm a license is current, check the state medical board.

Map: Anesthesiology per capita by county →

Where they work

Hospitals

Medical groups

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
258
Services billed
306
Patients’ average age
74
Most frequent Medicare services, 2023
ServiceTimesPatients
Anesthesia for lens surgery5957
Injection of anesthetic agent and/or steroid into other nerve or branch1717
Ultrasonic guidance for needle placement1717
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope1616
Anesthesia for procedure for total knee joint replacement1414
Anesthesia for procedure to assess heart electrical activity1414
Anesthesia for other procedure on lower abdomen1313
Anesthesia for other procedure on upper abdomen1313
Anesthesia for x-ray or radiation therapy1111

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.

Payments from drug and device companies

In 2025, 1 companies reported 1 payments worth $21.10 in total to this clinician.

By company
Merck Sharp & Dohme LLC$21.10
By type
Food and Beverage$21.10

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.

Who received the most in North Carolina →

Other Anesthesiology clinicians in Winston Salem

Sources

NPI registry (CMS NPPES, November 2026; record last updated March 1, 2019), Medicare Care Compare, Medicare Physician & Other Practitioners (2024), Medicare Part D Prescribers (2024) and Open Payments (2025). Information is self-reported or billed data and may be out of date; call before visiting.

NPI 1518253327. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.