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

CASSIE JILLIAN FIRESTONE
NPI 1104616853
Physician Assistant in Frederick, MD

Active since May 07, 2025
400 W 7TH ST, FREDERICK, MD 21701(240) 566-3300 Get Directions Write a Review

NPPES record last updated: June 24, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Cassie Jillian Firestone NPPES

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

CASSIE JILLIAN FIRESTONE (NPI 1104616853) is an individual physician assistant in Frederick, Maryland, licensed in Maryland (C0010547) and active in the NPI registry since May 2025.

NPPES Registry Identity

NPI1104616853
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameCASSIE JILLIAN FIRESTONE
Location Address400 W 7TH STFrederick, MD 21701-4506
Mailing Address461 Peleton StHagerstown, MD 21740-2299 · (443) 253-5045
Sole ProprietorYes
Enumeration DateMay 7, 2025
Last NPPES UpdateJune 24, 2026
NPPES CertifiedJune 24, 2026
NPI 1104616853 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 · C0010547
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.
400 W 7TH ST, Frederick, MD 21701

Other Providers at the Same Location NPPES 20

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

Speech-Language Pathologist
400 W 7TH ST
FREDERICK, MD 21701
Physical Therapist
400 W 7TH ST
FREDERICK, MD 21701
Nurse Anesthetist, Certified Registered
400 W 7TH ST
FREDERICK, MD 21701
Pediatrics (Neonatal-Perinatal Medicine)
400 W 7TH ST, NICU, FREDERICK MEMORIAL HOSPITAL
FREDERICK, MD 21701
Pharmacist
400 W 7TH ST
FREDERICK, MD 21701
Internal Medicine
400 W 7TH ST
FREDERICK, MD 21701
Family Medicine
400 W 7TH ST
FREDERICK, MD 21701
Nurse Practitioner (Acute Care)
400 W 7TH ST
FREDERICK, MD 21701

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 Cassie Firestone's NPI number?

The NPI number for Cassie Firestone is 1104616853. It was assigned to this individual provider in the NPPES registry on May 7, 2025.

Where is Cassie Firestone located?

Cassie Firestone practices at 400 W 7th St, Frederick, MD 21701. The listed phone number is (240) 566-3300.

What is Cassie Firestone's specialty?

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

When was this NPI record last updated?

The NPPES record for Cassie Firestone was last updated on June 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 52 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.