Leonard Mason, MD
Surgery Physician · Newark, DE
Leonard Mason, MD is a surgery physician with a practice address in Newark, Delaware, and NPI 1114122355, issued on Jun 18, 2007. Check the license (Delaware C1-0013726, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Leonard Mason
- Credential
- MD
- Primary taxonomy
- Surgery Physician 208600000X
- License numbers
- C1-0013726 DE
MD457506 PA
53123 TN
Self-reported in NPPES; status is on the state search - Practice location
- 4735 Ogletown Stanton RD Ste 3301, Newark, DE 19713
- Phone
- (302) 623-4370
- Enumerated
- Jun 18, 2007
- Record last updated
- Aug 13, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200629002696); accepts Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 2007
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 109 in Delaware → Look up another NPI →
Also registered at 4735 Ogletown Stanton RD Ste 3301
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joelle Briggs, NPAdult Health Nurse Practitioner1912467523
- Stacey ByamAdult Health Clinical Nurse Specialist1639750177
- Bonnie ChambersNurse Practitioner1972053619
- William Egan, M.D.Surgery Physician1508916909
- Eneyda Espino-Gomez, PA-CPhysician Assistant1134855620
- Michele Fiorentino, M.D.Surgery Physician1275928145
Verify Leonard Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDelaware Board of Medical Licensure and Discipline
Search for license C1-0013726Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $96.47
4 payments; by number, the most common kind was food and beverage; the largest payer was Smith+Nephew, Inc. The 17,103 providers of this specialty with any payment received $3,513.80 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
- Christiana Care Health Services IncNewark, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leonard Mason among 109 surgery physician records in Delaware
Leonard Mason, MD is one of 109 surgery physician records with a practice address in Delaware. 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 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 50% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2007 · median 2001 among the 73 with a school on file
- Record last updated2020 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in Delaware
There are 109 surgery physician records in Delaware.
All 109 in Delaware → Every provider in Newark → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Raafat Abdel-Misih, MDNewark, DE 197131821088048
- Joseph Bennett, M.D.Newark, DE 197131619967841
- William Egan, M.D.Newark, DE 197131508916909
- Isaias Irgau, MDNewark, DE 197131114954468
- Saima Khan, M.D.Newark, DE 197131215066048
- Koren Miller, M.D.Newark, DE 197131508993197
- Nikolay Mindadze, MDNewark, DE 197131447305107
- Bradley MudgeNewark, DE 197131205839321
Common questions
What is Leonard Mason, MD's NPI number?
Leonard Mason, MD's National Provider Identifier (NPI) is 1114122355, issued on Jun 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Leonard Mason, MD located?
The NPPES record lists a practice address at 4735 Ogletown Stanton RD Ste 3301, Newark, DE, 19713. Phone: (302) 623-4370. Providers update this record themselves, so call before visiting.
How can I verify Leonard Mason, MD's license?
NPPES lists Delaware license number C1-0013726, as entered by the provider. Search the Delaware Board of Medical Licensure and Discipline at https://delpros.delaware.gov/OH_VerifyLicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.