Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Katherine B Sirianni, PA-C

Physician Assistant in Germantown, MD · enumerated 2010 · practices at Cedar Ridge Counseling Centers LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1316254428

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Registry record

Entity type Individual (Type 1)

Name Mrs. Katherine B Sirianni

Credential PA-C

Sex Female

Practice address 19851 Observation Dr Ste 250, Germantown, MD, 20876

Phone (301) 972-0400

Fax (301) 916-1453

Enumeration date Sep 10, 2010

Last updated in NPPES Dec 15, 2025

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License C0004319 (MD) Primary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers Secondary

Other identifiers

Identifier	Type	State	Issuer
C0004319	Other	MD	MEDICAL LICENSE NUMBER

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 → Validate an NPI →

Frequently asked questions

What specialty is Katherine Sirianni?

Katherine Sirianni is registered in NPPES with the primary taxonomy of Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Bradley Bailey Physician Assistant · Germantown, MD NPI 1164996245 Cedar Ridge Counseling Centers LLC Mental Health Clinic/Center (Including Community Mental Health Center) · Germantown, MD NPI 1528980562

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-15.