DR. MARK JOSEPH CARTOSKI M.D.
NPI 1134430986
Pediatrics - Pediatric Cardiology in Wilmington, DE
About Dr. Mark Joseph Cartoski M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK JOSEPH CARTOSKI M.D. (NPI 1134430986) is an individual pediatric cardiology provider in Wilmington, Delaware, licensed in Delaware (C10012706) and active in the NPI registry since June 2010. He is enrolled in Medicare PECOS, maintains a secondary practice location in Norfolk, and is a graduate of Other (2010).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 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. Mark Joseph Cartoski 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.
Medicare Billing Reassignment
Medicare enrollment records show Mark Cartoski reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Wilmington, DE 19803
- Reassigned Medicare billing, Delaware enrollment
- 526 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.
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.
WILMINGTON, DE 19803
WILMINGTON, DE 19803
WILMINGTON, DE 19803
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 Mark Cartoski's NPI number?
The NPI number for Mark Cartoski is 1134430986. It was assigned to this individual provider in the NPPES registry on June 27, 2010.
Where is Mark Cartoski located?
Mark Cartoski practices at 1600 Rockland Rd, Wilmington, DE 19803. The listed phone number is (302) 651-4200.
What is Mark Cartoski's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.
Is Mark Cartoski enrolled in Medicare?
Yes. Mark Cartoski 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 Mark Cartoski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Cartoski reassigns Medicare benefits to The Nemours Foundation (Wilmington, 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 Mark Cartoski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Cartoski accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and AmeriHealth Caritas Next and 1 other insurer list Mark Cartoski 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.
When was this NPI record last updated?
The NPPES record for Mark Cartoski was last updated on June 10, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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. Mark Joseph Cartoski, M.D. · NPI 1134430986
Pediatric Cardiology physician in Wilmington, Delaware. Individual provider, active in the CMS NPPES registry since June 27, 2010.
## Identity
- **NPI:** 1134430986 (Entity type: Individual)
- **Enumerated:** June 27, 2010
- **Primary specialty:** Pediatrics - Pediatric Cardiology · taxonomy 2080P0202X
- **State license:** C10012706 (Delaware)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1600 ROCKLAND RD, Wilmington, DE 19803
- **Phone:** (302) 651-4200 · **Fax:** (302) 651-5345
## 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:** The Nemours Foundation (NPI 1366594699, Wilmington, DE), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2010
## Record status
- **NPPES last updated:** June 10, 2019
- **Other identifiers:** Medicaid 250468405 (DE); Medicaid 1035254600 (PA)
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Source: [NPI Profile](https://npiprofile.com/npi/1134430986) · Data from the CMS NPPES public registry.