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MRS. KATHERINE B SIRIANNI PA-C
NPI 1316254428
Physician Assistant in Germantown, MD

Active since September 10, 2010PECOS Enrolled
19851 OBSERVATION DR STE 250, GERMANTOWN, MD 20876(301) 972-0400(301) 916-1453 Get Directions Write a Review

NPPES record last updated: December 15, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Dec 15, 2025, Jul 25, 2024, Mar 7, 2024 and 2 more (5 updates tracked since 2018).

About Mrs. Katherine B Sirianni Pa-c NPPES

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

MRS. KATHERINE B SIRIANNI PA-C (NPI 1316254428) is an individual physician assistant in Germantown, Maryland, licensed in Maryland (C0004319) and active in the NPI registry since September 2010. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1316254428
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameMRS. KATHERINE B SIRIANNICredential: PA-C
Location Address19851 OBSERVATION DR STE 250Germantown, MD 20876-4151
Mailing Address19851 Observation Dr Ste 250Germantown, MD 20876-4151 · (301) 972-0400 · Fax (301) 916-1453
Phone(301) 972-0400
Fax(301) 916-1453
Sole ProprietorNo
Enumeration DateSeptember 10, 2010
Last NPPES UpdateDecember 15, 20255 updates tracked since enumeration
NPPES CertifiedDecember 15, 2025
✔ NPI 1316254428 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in MD · C0004319
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
19851 OBSERVATION DR STE 250, Germantown, MD 20876
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Other Names 1

Former Name (1)Ms. Katherine R Bonelli Pa-c

Other Identifiers 1

OtherC0004319MD · Medical License Number

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mrs. Katherine B Sirianni Pa-c is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20876 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$100.31 typical visit price
range $65.18 – $194.86
Typical copayment $25.07 (range $16.29 – $48.71)
Most-billed visit code 99203
Established Patient
$80.66 typical visit price
range $21.40 – $158.88
Typical copayment $20.16 (range $5.35 – $39.72)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

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

BRADLEY BAILEY PA-C
Physician Assistant
19851 OBSERVATION DR STE 250
GERMANTOWN, MD 20876
Montgomery County (301) 972-0400

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 Katherine Sirianni's NPI number?

The NPI number for Katherine Sirianni is 1316254428. It was assigned to this individual provider in the NPPES registry on September 10, 2010. The provider is also known as Ms. Katherine R Bonelli Pa-C.

Where is Katherine Sirianni located?

Katherine Sirianni practices at 19851 Observation Dr Ste 250, Germantown, MD 20876. The listed phone number is (301) 972-0400.

What is Katherine Sirianni's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Katherine Sirianni enrolled in Medicare?

Yes. Katherine Sirianni is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Katherine Sirianni was last updated on December 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.