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MAJOR MEDICAL LLC
NPI 1093039570
Family Medicine in Silver Spring, MD

Active since March 26, 2010CLIA Certified · 2 labs
1300 SPRING ST, SUITE 122, SILVER SPRING, MD 20910(301) 585-1833(240) 235-3898 Get Directions Write a Review

NPPES record last updated: September 21, 2018. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Major Medical Llc NPPES

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

MAJOR MEDICAL LLC (NPI 1093039570) is a healthcare organization registered as a family medicine in Silver Spring, Maryland and active in the NPI registry since March 2010. The organization holds 2 active CLIA laboratory certificates and lists Mark Ammaan Major, Doctor/owner, as its authorized official.

NPPES Registry Identity

NPI1093039570
Entity TypeOrganization
Primary Taxonomy207Q00000X
Legal Business NameMAJOR MEDICAL LLC
Location Address1300 SPRING ST, SUITE 122Silver Spring, MD 20910-3616
Mailing Address2129 Clark PlSilver Spring, MD 20910-1175 · (301) 585-1833 · Fax (240) 235-3898
Phone(301) 585-1833
Fax(240) 235-3898
Organization SubpartNo
Authorized OfficialMark Ammaan MajorDoctor/owner · (301) 585-1833
Enumeration DateMarch 26, 2010
Last NPPES UpdateSeptember 21, 2018
✔ NPI 1093039570 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
Licenses✔ Licensed in MD · MD64592✔ Licensed in DC · MD036021
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
Also ListedDurable Medical Equipment & Medical SuppliesTaxonomy 332B00000X
1300 SPRING ST, Silver Spring, MD 20910
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Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-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)

Major Medical 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 Major Medical LLC, which bills Medicare for the services this clinician delivers.

Clinician (1)

Mark Major, M.D.
Family Practice
NPI 1407032485
1300 SPRING STREET SUITE 122
Silver Spring, MD 20910
(301) 585-1833
✔ 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.

CLIA Laboratory Certificates CMS CLIA 2

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 21D2043931

Major Medical LLC · Silver Spring, MD
Active · expires Jul 31, 2027
CLIA Number21D2043931
Laboratory TypePhysician Office
Certificate Effective DateAugust 1, 2025
Certificate Expiration DateJuly 31, 2027
Laboratory DirectorDr. Mark A. Major
Laboratory Phone(301) 585-1833
Laboratory LocationMajor Medical LLC1300 Spring Street #122, Silver Spring, MD 20910
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

Certificate of Waiver 21D2122506

Major Medical LLC · Clinton, MD
Active · expires Nov 29, 2026
CLIA Number21D2122506
Laboratory TypePhysician Office
Certificate Effective DateNovember 30, 2024
Certificate Expiration DateNovember 29, 2026
Laboratory DirectorMark Major
Laboratory Phone(301) 585-1833
Laboratory LocationMajor Medical LLC9135 Piscataway Rd #102, Clinton, MD 20735
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory to perform only waived tests.

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 Major Medical LLC's NPI number?

The NPI number for Major Medical LLC is 1093039570. It was assigned to this organization in the NPPES registry on March 26, 2010.

Where is Major Medical LLC located?

Major Medical LLC is located at 1300 Spring St Suite 122, Silver Spring, MD 20910. The listed phone number is (301) 585-1833.

What is Major Medical LLC's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Major Medical LLC enrolled in Medicare?

Yes. Major Medical LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Major Medical LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Family Practice) reassigns their Medicare billing to Major Medical 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.

Does Major Medical LLC hold CLIA laboratory certificates?

Yes. 2 active CLIA laboratory certificates are associated with this NPI under the federal Clinical Laboratory Improvement Amendments program. The certificates are listed in the CLIA Laboratory Certificates section above.

When was this NPI record last updated?

The NPPES record for Major Medical LLC was last updated on September 21, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.