DR. WILLIAM L DIEHL M.D.
NPI 1629068457
Surgery - Surgical Oncology in Livingston, NJ

Active since October 24, 2005PECOS EnrolledAccepts Medicare Assignment
75 E NORTHFIELD RD, LIVINGSTON, NJ 07039(973) 436-1530(973) 422-0414 Get Directions Write a Review

NPPES record last updated: February 16, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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

NPI1629068457
Entity TypeIndividualMale
Primary Taxonomy2086X0206X
Provider Legal NameDR. WILLIAM L DIEHLCredential: M.D.
Location Address75 E NORTHFIELD RDLivingston, NJ 07039-4532
Mailing Address261 James St, Suite 2gMorristown, NJ 07960-6392 · (973) 267-6400 · Fax (973) 267-7295
Fax(973) 422-0414
Sole ProprietorNo
Medical School CMSOtherGraduated 1981
Enumeration DateOctober 24, 2005
Last NPPES UpdateFebruary 16, 2026
NPPES CertifiedFebruary 16, 2026
NPI 1629068457 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

Primary SpecialtySurgery · Surgical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2086X0206X
License Licensed in NJ · 25MA04355800
Definition
A surgical oncologist is a well-qualified surgeon who has obtained additional training and experience in the multidisciplinary approach to the prevention, diagnosis, treatment, and rehabilitation of cancer patients, and devotes a major portion of his or her professional practice to these activities and cancer research.
Also ListedSurgeryTaxonomy 208600000X · License 25MA04355800 (NJ)
75 E NORTHFIELD RD, Livingston, NJ 07039

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.

PECOS PAC ID7113962267
PECOS Enrollment IDI20050621000068
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
158 services149 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
97 services97 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
60 services55 patients
Partial removal of breast 19301
A partial removal of the breast, also known as a lumpectomy, involves taking out a portion of the breast tissue to eliminate concerning cells. It's typically performed when the problem area is limited in size. This procedure helps to preserve most of the breast's appearance while aiming to remove all the unhealthy cells.
36 services34 patients
Biopsy of breast and placement of locating device using ultrasound, first growth 19083
A breast biopsy with locating device placement involves taking a small sample from an unusual growth, using ultrasound for precise targeting. This sample is studied for any abnormal cells. A locating device is also placed to mark the area for future reference.
34 services34 patients
Biopsy of breast and placement of locating device using x-ray with needle, first growth 19081
A biopsy of the breast involves extracting a small sample of tissue for examination. A locating device placement, guided by x-ray, aids in identifying the exact spot of the first growth. A needle is used in both processes to ensure precision and minimal discomfort.
27 services26 patients

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, NJ
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310015
Location100 Madison AveMorristown, NJ 07960 · Morris County
Emergency services Birthing friendly

Hackettstown Medical Center

Acute Care Hospitals · Hackettstown, NJ
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number310115
Location651 Willow Grove StHackettstown, NJ 07840 · Warren County
Emergency services

Physician 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.

New Patient
$190.92 typical visit price
range $63.84 – $190.92
Typical copayment $47.73 (range $15.96 – $47.73)
Most-billed visit code 99205
Established Patient
$79.09 typical visit price
range $20.97 – $155.92
Typical copayment $19.77 (range $5.24 – $38.98)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

Pediatrics (Pediatric Endocrinology)
75 E NORTHFIELD RD
LIVINGSTON, NJ 07039
Audiologist
75 E NORTHFIELD RD
LIVINGSTON, NJ 07039
Physician Assistant (Medical)
75 E NORTHFIELD RD
LIVINGSTON, NJ 07039
Dietitian, Registered
75 E NORTHFIELD RD
LIVINGSTON, NJ 07039
Audiologist
75 E NORTHFIELD RD
LIVINGSTON, NJ 07039
Internal Medicine
75 E NORTHFIELD RD
LIVINGSTON, NJ 07039
Internal Medicine
75 E NORTHFIELD RD
LIVINGSTON, NJ 07039
Obstetrics & Gynecology
75 E NORTHFIELD RD
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.