MARK SULLIVAN
NPI 1346614641
Social Worker - Clinical in Silver Spring, MD
About Mark Sullivan NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK SULLIVAN (NPI 1346614641) is an individual clinical provider in Silver Spring, Maryland, licensed in District Of Columbia (LC50079401) and active in the NPI registry since November 2015. He is enrolled in Medicare PECOS and is a graduate of Other (2009).
NPPES Registry Identity
Specialties & Licenses
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
Mark Sullivan 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 Sullivan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Silver Spring, MD 20910
- Reassigned Medicare billing, District of Columbia enrollment
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20910 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
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Sullivan's NPI number?
The NPI number for Mark Sullivan is 1346614641. It was assigned to this individual provider in the NPPES registry on November 24, 2015.
Where is Mark Sullivan located?
Mark Sullivan practices at 8703 Milford Ave, Silver Spring, MD 20910. The listed phone number is (202) 264-0070.
What is Mark Sullivan's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Mark Sullivan enrolled in Medicare?
Yes. Mark Sullivan 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 Sullivan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Sullivan reassigns Medicare benefits to Mark Sullivan LLC (Silver Spring, MD). 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 Sullivan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mark Sullivan was last updated on March 7, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Mark Sullivan · NPI 1346614641
Clinical provider in Silver Spring, Maryland. Individual provider, active in the CMS NPPES registry since November 24, 2015.
## Identity
- **NPI:** 1346614641 (Entity type: Individual)
- **Enumerated:** November 24, 2015
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** LC50079401 (District of Columbia)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 8703 MILFORD AVE, Silver Spring, MD 20910-5030
- **Phone:** (202) 264-0070
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Mark Sullivan LLC (NPI 1710470711, Silver Spring, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** March 7, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1346614641) · Data from the CMS NPPES public registry.