William L. Diehl, M.D.
Surgical Oncology Physician · Livingston, NJ
William L. Diehl, M.D. is a surgical oncology physician with a practice address in Livingston, New Jersey, and NPI 1629068457, issued on Oct 24, 2005. Check the license (New Jersey 25MA04355800, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- William L. Diehl
- Credential
- M.D.
- Primary taxonomy
- Surgical Oncology Physician 2086X0206X
- License number
- 25MA04355800 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 75 E Northfield RD, Livingston, NJ 07039
- Phone
- (973) 436-1530
- Enumerated
- Oct 24, 2005
- Record last updated
- Feb 16, 2026
- Fax
- (973) 422-0414
- Medicare enrollment
- Enrolled (PECOS I20050621000068); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest surgical oncology physician records → All 69 in New Jersey → Look up another NPI →
Also registered at 75 E Northfield RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Donna Adamoli, M.D.Internal Medicine Physician1104880871
- Tania Afonso, D.O.Emergency Medicine Physician1417210394
- Sairah Ahmad, AUD, CCC-AAudiologist1033222716
- Frances Anerousis, M.D.Internal Medicine Physician1073723896
- Alexa Bacino, RD, CDERegistered Dietitian1922671452
- Malka Bannet, D.O.Internal Medicine Physician1639467756
Verify William L. Diehl in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA04355800Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% fewer Medicare Part D claims than the average surgical oncology physician in 2024
66 Medicare Part D claims for 47 beneficiaries, against an average of 87 among the 1,237 providers of this specialty who prescribed in Part D. 28 claims were for opioids.
Most prescribed
- Oxycodone-Acetaminophen27 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $18.76
1 payment: food and beverage; the largest payer was Leica Microsystems Inc. The 1,132 providers of this specialty with any payment received $4,224.74 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Summit Medical Group PABerkeley Heights, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William L. Diehl among 69 surgical oncology physician records in New Jersey
William L. Diehl, M.D. is one of 69 surgical oncology physician records with a practice address in New Jersey. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 96% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1981 · median 2004 among the 49 with a school on file
- Record last updated2026 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086X0206X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgical Oncology Physician providers in New Jersey
There are 69 surgical oncology physician records in New Jersey.
All 69 in New Jersey → Every provider in Livingston → Surgical Oncology Physician nationwide →
The 8 surgical oncology physician records with the nearest ZIP codes
- Russell Langan, MDLivingston, NJ 070391063646313
- Elissa Santoro, MDLivingston, NJ 070391528023405
- Sarah Schaefer, MDLivingston, NJ 070391427014182
- Franz Smith, M.D.Livingston, NJ 070391942503610
- Rachelle Leong, MDMontclair, NJ 070421053636183
- Adriana Suarez-Ligon, MDNorth Bergen, NJ 070471366679946
- Joseph Raccuia, M.D.Hoboken, NJ 070301013961309
- Sang Lee, M.D.Warren, NJ 070591396758983
Common questions
What is William L. Diehl, M.D.'s NPI number?
William L. Diehl, M.D.'s National Provider Identifier (NPI) is 1629068457, issued on Oct 24, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William L. Diehl, M.D. located?
The NPPES record lists a practice address at 75 E Northfield RD, Livingston, NJ, 07039. Phone: (973) 436-1530. Providers update this record themselves, so call before visiting.
How can I verify William L. Diehl, M.D.'s license?
NPPES lists New Jersey license number 25MA04355800, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William L. Diehl, M.D. prescribe under Medicare Part D?
In 2024, William L. Diehl, M.D. had 66 Medicare Part D claims for 47 beneficiaries; the average among surgical oncology physician prescribers was 87. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.