DR. LEONARD MASON MD
NPI 1114122355
Surgery in Newark, DE
About Dr. Leonard Mason Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LEONARD MASON MD (NPI 1114122355) is an individual surgery provider in Newark, Delaware, licensed in Delaware (C1-0013726) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS, is affiliated with Union Hospital Of Cecil County, and is a graduate of Temple University School Of Medicine (2007).
NPPES Registry Identity
Specialties & Licenses 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Leonard Mason Md 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.
Medicare Billing Reassignment
Medicare enrollment records show Leonard Mason reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Newark, DE 19713
- Reassigned Medicare billing, Delaware enrollment
- 1,531 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Union Hospital Of Cecil County
Acute Care Hospitals · Elkton, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 19713 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 18
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NEWARK, DE 19713
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 Leonard Mason's NPI number?
The NPI number for Leonard Mason is 1114122355. It was assigned to this individual provider in the NPPES registry on June 18, 2007.
Where is Leonard Mason located?
Leonard Mason practices at 4735 Ogletown Stanton Rd Ste 3301, Newark, DE 19713. The listed phone number is (302) 623-4370.
What is Leonard Mason's specialty?
The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.
Is Leonard Mason enrolled in Medicare?
Yes. Leonard Mason 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.
Which organization bills Medicare for Leonard Mason's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leonard Mason reassigns Medicare benefits to Christiana Care Health Services Inc. (Newark, DE). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Leonard Mason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Leonard Mason accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and AmeriHealth Caritas Next list Leonard Mason as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Leonard Mason affiliated with any hospitals?
According to CMS data, Leonard Mason is affiliated with Union Hospital Of Cecil County.
When was this NPI record last updated?
The NPPES record for Leonard Mason was last updated on August 13, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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.
# Dr. Leonard Mason, MD · NPI 1114122355
Surgery physician in Newark, Delaware. Individual provider, active in the CMS NPPES registry since June 18, 2007.
## Identity
- **NPI:** 1114122355 (Entity type: Individual)
- **Enumerated:** June 18, 2007
- **Primary specialty:** Surgery · taxonomy 208600000X
- **State license:** C1-0013726 (Delaware)
- **Sole proprietor:** No
## Practice location
- **Address:** 4735 OGLETOWN STANTON RD STE 3301, Newark, DE 19713-7021
- **Phone:** (302) 623-4370
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Christiana Care Health Services Inc. (NPI 1215975149, Newark, DE), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Temple University School Of Medicine, class of 2007
## Record status
- **NPPES last updated:** August 13, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1114122355) · Data from the CMS NPPES public registry.