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MARK M ZIMMERMANN LCSW-R
NPI 1275782179
Counselor - Addiction (Substance Use Disorder) in Bethesda, MD

Active since September 16, 2008PECOS Enrolled
4710 ELM ST APT W1304, BETHESDA, MD 20814(917) 830-3463(347) 717-7750 Get Directions Write a Review

NPPES record last updated: May 28, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 28, 2025, Apr 23, 2024, Mar 4, 2024 and 2 more (5 updates tracked since 2016).

About Mark M Zimmermann Lcsw-r NPPES

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

MARK M ZIMMERMANN LCSW-R (NPI 1275782179) is an individual addiction (substance use disorder) provider in Bethesda, Maryland, licensed in New York (081485) and active in the NPI registry since September 2008. He is enrolled in Medicare PECOS and is a graduate of Other (2009).

NPPES Registry Identity

NPI1275782179
Entity TypeIndividualMale
Primary Taxonomy101YA0400X
Provider Legal NameMARK M ZIMMERMANNCredential: LCSW-R
Location Address4710 ELM ST APT W1304Bethesda, MD 20814-3828
Mailing Address4710 Elm St Apt W1304Bethesda, MD 20814-3828 · (917) 830-3463 · Fax (347) 717-7750
Phone(917) 830-3463
Fax(347) 717-7750
Sole ProprietorYes
Medical School CMSOtherGraduated 2009
Enumeration DateSeptember 16, 2008
Last NPPES UpdateMay 28, 20255 updates tracked since enumeration
NPPES CertifiedMay 28, 2025
✔ NPI 1275782179 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyCounselor · Addiction (Substance Use Disorder)Behavioral Health & Social Service Providers
Taxonomy Code101YA0400X
License✔ Licensed in NY · 081485
Also ListedSocial Worker · ClinicalTaxonomy 1041C0700X · License R081485 (NY), 081485 (NY), 32135 (MD), LC200003450 (DC)
4710 ELM ST APT W1304, Bethesda, MD 20814
Open in Google Maps ↗

Other Identifiers 3

Medicaid100492058MD
Other1386005213NY · Npi
Medicaid03366314NY

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark M Zimmermann Lcsw-r is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID9638397300
PECOS Enrollment IDI20140822000715
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 Reassignments

2

Medicare enrollment records show Mark Zimmermann reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mark Zimmermann, Lcsw, PLLC
Same address
Clinical
4710 ELM ST APT W1304
Bethesda, MD 20814
  • Reassigned Medicare billing, District of Columbia enrollment
NPI 1386005213 (917) 830-3463
East Point Medical PC
209 mi
Family Medicine
7116 GRAND AVE
Maspeth, NY 11378
  • Reassigned Medicare billing, New York enrollment
  • 43 clinicians in this Medicare group
NPI 1518571751 (929) 777-4325

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 2

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.

Psychotherapy, 45 minutes 90834
Psychotherapy is a treatment method where you converse with a therapist about your thoughts, feelings, and behaviors. In a 45-minute session, the therapist assists you in understanding and managing your mental health concerns, improving emotional wellness, and promoting personal growth.
171 services14 patients
Psychiatric diagnostic evaluation 90791
A psychiatric diagnostic evaluation is a thorough assessment used to identify any mental health conditions you may have. It involves a detailed discussion about your symptoms, thoughts, feelings and behavior patterns. Your medical history and family's mental health history are also considered.
12 services11 patients

Other Providers at the Same Location NPPES

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

MARK ZIMMERMANN, LCSW, PLLC
Social Worker (Clinical)
4710 ELM ST APT W1304
BETHESDA, MD 20814
Montgomery County (917) 830-3463

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 Zimmermann's NPI number?

The NPI number for Mark Zimmermann is 1275782179. It was assigned to this individual provider in the NPPES registry on September 16, 2008.

Where is Mark Zimmermann located?

Mark Zimmermann practices at 4710 Elm St Apt W1304, Bethesda, MD 20814. The listed phone number is (917) 830-3463.

What is Mark Zimmermann's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

Is Mark Zimmermann enrolled in Medicare?

Yes. Mark Zimmermann is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Mark Zimmermann's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Zimmermann reassigns Medicare benefits to 2 organizations: Mark Zimmermann, Lcsw, PLLC (Bethesda, MD) and East Point Medical PC (Maspeth, NY). Each 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 Zimmermann's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Zimmermann accept?

Health plans from Oscar Health list Mark Zimmermann 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 Zimmermann was last updated on May 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months 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.