Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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William John Willis, MD

Individual provider Specialist · NPI 1700882180

William John Willis, MD practises Anesthesiology in Denville, New Jersey. Qualified in 1988, 38 years ago. Practices with Anesthesia Associates of Morristown PA, a 168-clinician group and accepts Medicare assignment. Licensed in New Jersey.

Years since qualifying
38
Licensed in
NJ
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3130 Route 10
Denville, NJ 07834-3455
Phone: (973) 442-9980
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence 25MA05786500 (NJ)
Specialist Taxonomy 174400000X · Licence MA57865 (NJ)

Record details

NPI number1700882180
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 22, 2005
Last updated in NPPESDecember 16, 2021
Certification dateDecember 16, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyANESTHESIOLOGY
Medical schoolOTHER
Graduated 1988 (38 years in practice)
Group practice Anesthesia Associates Of Morristown Pa — 168 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients420
Services billed 443 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Anesthesia Associates of Morristown PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 168 clinicians in the practice; 12 are shown here.

Other providers in Denville