MARK SULLIVAN LLC
NPI 1710470711
Social Worker - Clinical in Silver Spring, MD

Active since June 13, 2018
8703 MILFORD AVE, SILVER SPRING, MD 20910(202) 264-0070 Get Directions Write a Review

NPPES record last updated: March 7, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Mar 7, 2024, Jun 13, 2018 (2 updates tracked since 2018).

About Mark Sullivan Llc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK SULLIVAN LLC (NPI 1710470711) is a healthcare organization registered as a clinical in Silver Spring, Maryland and active in the NPI registry since June 2018. The organization lists Mark J Sullivan, Clinical Social Worker, as its authorized official.

NPPES Registry Identity

NPI1710470711
Entity TypeOrganization
Primary Taxonomy1041C0700X
Legal Business NameMARK SULLIVAN LLC
Location Address8703 MILFORD AVESilver Spring, MD 20910-5030
Mailing Address8703 Milford AveSilver Spring, MD 20910-5030 · (202) 264-0070
Organization SubpartNo
Authorized OfficialMark J SullivanClinical Social Worker · (202) 264-0070
Enumeration DateJune 13, 2018
Last NPPES UpdateMarch 7, 20242 updates tracked since enumeration
NPPES CertifiedMarch 7, 2024
✔ NPI 1710470711 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in DC · LC50079401
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
8703 MILFORD AVE, Silver Spring, MD 20910

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark Sullivan Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Mark Sullivan LLC, which bills Medicare for the services this clinician delivers.

Clinician (1)

Clinical Social Worker
NPI 1346614641
8703 MILFORD AVE
Silver Spring, MD 20910
(202) 264-0070
✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 LLC's NPI number?

The NPI number for Mark Sullivan LLC is 1710470711. It was assigned to this organization in the NPPES registry on June 13, 2018.

Where is Mark Sullivan LLC located?

Mark Sullivan LLC is located at 8703 Milford Ave, Silver Spring, MD 20910. The listed phone number is (202) 264-0070.

What is Mark Sullivan LLC's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Mark Sullivan LLC enrolled in Medicare?

Yes. Mark Sullivan LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Mark Sullivan LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Clinical Social Worker) reassigns their Medicare billing to Mark Sullivan LLC. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Mark Sullivan LLC 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.