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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ROSENTHAL & SIEKANOWICZ, LLC
NPI 1225157407
Specialist in Silver Spring, MD

Active since March 28, 2007
10313 GEORGIA AVENUE, SUITE 107, SILVER SPRING, MD 20902(301) 681-3100 Get Directions Write a Review

NPPES record last updated: August 18, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

About Rosenthal & Siekanowicz, Llc NPPES

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

ROSENTHAL & SIEKANOWICZ, LLC (NPI 1225157407) is a healthcare organization registered as a specialist in Silver Spring, Maryland and active in the NPI registry since March 2007. The organization lists Lachanda Mills, Billing Administrator, as its authorized official.

NPPES Registry Identity

NPI1225157407
Entity TypeOrganization
Primary Taxonomy174400000X
Legal Business NameROSENTHAL & SIEKANOWICZ, LLC
Location Address10313 GEORGIA AVENUE, SUITE 107Silver Spring, MD 20902-5006
Mailing Address10313 Georgia Ave Ste 107Silver Spring, MD 20902-5006 · (301) 681-3100 · Fax (301) 681-3367
Phone(301) 681-3100
Organization SubpartNo
Authorized OfficialLachanda MillsBilling Administrator · (585) 455-3537
Enumeration DateMarch 28, 2007
Last NPPES UpdateAugust 18, 2026
NPPES CertifiedAugust 18, 2026
✔ NPI 1225157407 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
License✔ Licensed in MD · D18094
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
10313 GEORGIA AVENUE, Silver Spring, MD 20902
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Other Identifiers 1

Medicaid250041800MD

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

Other Providers at the Same Location NPPES 3

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

ARNOLD & HANDELMAN DDS PC
Dentist
10313 GEORGIA AVENUE, SUITE 103
SILVER SPRING, MD 20902
Montgomery County (301) 593-7500
DR ITSCOITZ SEGAL & GRAVINO PA
Internal Medicine (Cardiovascular Disease)
10313 GEORGIA AVENUE, SUITE 307
SILVER SPRING, MD 20902
Montgomery County (301) 681-9095
BRIAN MICHAEL HANDELMAN DDS
Dentist (General Practice)
10313 GEORGIA AVENUE, SUITE 103 ARNOLD AND HANDELMAN DDS PC
SILVER SPRING, MD 20902
Montgomery County (301) 593-7500

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 Rosenthal & Siekanowicz, LLC's NPI number?

The NPI number for Rosenthal & Siekanowicz, LLC is 1225157407. It was assigned to this organization in the NPPES registry on March 28, 2007.

Where is Rosenthal & Siekanowicz, LLC located?

Rosenthal & Siekanowicz, LLC is located at 10313 Georgia Avenue Suite 107, Silver Spring, MD 20902. The listed phone number is (301) 681-3100.

What is Rosenthal & Siekanowicz, LLC's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

When was this NPI record last updated?

The NPPES record for Rosenthal & Siekanowicz, LLC was last updated on August 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 days 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.