Rosenthal & Siekanowicz, LLC

Rosenthal & Siekanowicz, LLC is a healthcare organization registered as Specialist in Silver Spring, MD, holding Type 2 (organization) NPI 1225157407 since 2007. The authorized official on file is Claudia Mendoza, Billing Administrator.

✓ Active NPI ✓ Valid NPI checksum

NPI	1225157407
Entity type	Organization (Type 2)
Legal business name	Rosenthal & Siekanowicz, LLC
Practice address	10313 GEORGIA AVENUE, SUITE 107, Silver Spring, MD, 20902
Phone	3016813100
Enumeration date	2007-03-28
Last updated in NPPES	2009-05-07

Authorized official

Name	Claudia Mendoza
Title	Billing Administrator
Phone	3016813100

Taxonomy & classification

Taxonomy code	Specialty	Primary	License	State
174400000X	Specialist	Primary	D18094	MD

Other identifiers

Identifier	Type	State	Issuer
250041800	Medicaid	MD	—

Copy-ready billing details

Provider: Rosenthal & Siekanowicz, LLC
NPI: 1225157407
Taxonomy: 174400000X (Specialist)
Address: 10313 GEORGIA AVENUE, SUITE 107, Silver Spring, MD, 20902

Providers at this address

NPI	Name	Type	Specialty	Location
1588731566	Dr Itscoitz Segal & Gravino PA	Organization	Cardiovascular Disease Physician	Silver Spring, MD
1689894743	Brian Handelman	Individual	General Practice Dentistry	Silver Spring, MD
1144425737	Arnold & Handelman DDS PC	Organization	Dentist	Silver Spring, MD

Verify this record

Cross-check NPI 1225157407 against the authoritative CMS record: view Rosenthal & Siekanowicz, LLC on the official NPPES registry .

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.

Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2009-05-07. Verify at npiregistry.cms.hhs.gov.

Where is Rosenthal & Siekanowicz, LLC located?

The practice location on file with NPPES is in Silver Spring, MD.

Source: CMS NPPES (public data). Snapshot 2026-07-10. Provider record last updated 2009-05-07.