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MR. MARWAN CASTELLANI LCSW-C
NPI 1679002471
Social Worker - Clinical in Montgomery Village, MD

Active since June 06, 2017PECOS Enrolled
18502 OFFICE PARK DRIVE, MONTGOMERY VILLAGE, MD 20886(301) 509-9359 Get Directions Write a Review

NPPES record last updated: July 21, 2022. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jul 21, 2022, Jun 6, 2017 (2 updates tracked since 2017).

About Mr. Marwan Castellani Lcsw-c NPPES

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

MR. MARWAN CASTELLANI LCSW-C (NPI 1679002471) is an individual clinical provider in Montgomery Village, Maryland, licensed in Maryland (16981) and active in the NPI registry since June 2017. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1679002471
Entity TypeIndividualMale
Primary Taxonomy1041C0700X
Provider Legal NameMR. MARWAN CASTELLANICredential: LCSW-C
Location Address18502 OFFICE PARK DRIVEMontgomery Village, MD 20886
Mailing Address18502 Office Park DrMontgomery Village, MD 20886-0585 · (301) 509-9359
Phone(301) 509-9359
Sole ProprietorNo
Enumeration DateJune 6, 2017
Last NPPES UpdateJuly 21, 20222 updates tracked since enumeration
✔ NPI 1679002471 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 MD · 16981
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.
18502 OFFICE PARK DRIVE, Montgomery Village, MD 20886
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mr. Marwan Castellani Lcsw-c is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Marwan Castellani reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Midcounty Therapy, LLC
Same address
Clinical
18502 OFFICE PARK DR
Montgomery Village, MD 20886
  • Reassigned Medicare billing, District of Columbia enrollment
  • 3 clinicians in this Medicare group
NPI 1518339498 (301) 509-9359

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 20886 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$0.00 typical visit price
range $65.18 – $194.86
Typical copayment $0.00 (range $16.29 – $48.71)
Most-billed visit code NA
Established Patient
$80.66 typical visit price
range $21.40 – $158.88
Typical copayment $20.16 (range $5.35 – $39.72)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MR. JIMMY SHANJUN CHEN MD
Psychiatry & Neurology (Psychiatry)
18502 OFFICE PARK DRIVE
MONTGOMERY VILLAGE, MD 20886
Montgomery County (301) 740-2680

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 Marwan Castellani's NPI number?

The NPI number for Marwan Castellani is 1679002471. It was assigned to this individual provider in the NPPES registry on June 6, 2017.

Where is Marwan Castellani located?

Marwan Castellani practices at 18502 Office Park Drive, Montgomery Village, MD 20886. The listed phone number is (301) 509-9359.

What is Marwan Castellani's specialty?

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

Is Marwan Castellani enrolled in Medicare?

Yes. Marwan Castellani is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Marwan Castellani's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marwan Castellani reassigns Medicare benefits to Midcounty Therapy, LLC (Montgomery Village, 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 Marwan Castellani'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 Marwan Castellani was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.