DR. WILLIAM L DIEHL M.D.
NPI 1629068457
Surgery - Surgical Oncology in Livingston, NJ
About Dr. William L Diehl M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM L DIEHL M.D. (NPI 1629068457) is an individual surgical oncology provider in Livingston, New Jersey, licensed in New Jersey (25MA04355800) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, is affiliated with Morristown Medical Center, and is a graduate of Other (1981).
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. William L Diehl M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 10
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Morristown Medical Center
Acute Care Hospitals · Morristown, NJHackettstown Medical Center
Acute Care Hospitals · Hackettstown, NJPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 07039 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LIVINGSTON, NJ 07039
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is William Diehl's NPI number?
The NPI number for William Diehl is 1629068457. It was assigned to this individual provider in the NPPES registry on October 24, 2005.
Where is William Diehl located?
William Diehl practices at 75 E Northfield Rd, Livingston, NJ 07039. The listed phone number is (973) 436-1530.
What is William Diehl's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Surgical Oncology, with taxonomy code 2086X0206X.
Is William Diehl enrolled in Medicare?
Yes. William Diehl is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Is William Diehl affiliated with any hospitals?
According to CMS data, William Diehl is affiliated with Morristown Medical Center and Hackettstown Medical Center.
When was this NPI record last updated?
The NPPES record for William Diehl was last updated on February 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.