CALLIE ELIZABETH WILLIAMS DNP, AGNP-C
NPI 1336022417
Nurse Practitioner in Towson, MD
About Callie Elizabeth Williams Dnp, Agnp-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CALLIE ELIZABETH WILLIAMS DNP, AGNP-C (NPI 1336022417) is an individual nurse practitioner in Towson, Maryland, licensed in Maryland (R242805) and active in the NPI registry since July 2025. She is enrolled in Medicare PECOS, is affiliated with Greater Baltimore Medical Center, and is a graduate of Other (2025).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Callie Elizabeth Williams Dnp, Agnp-c is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Callie Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Baltimore, MD 21204
- Reassigned Medicare billing, Maryland enrollment
- 444 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Greater Baltimore Medical Center
Acute Care Hospitals · Baltimore, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21204 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
TOWSON, MD 21204
TOWSON, MD 21204
TOWSON, MD 21204
BALTIMORE, MD 21204
BALTIMORE, MD 21204
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 Callie Williams's NPI number?
The NPI number for Callie Williams is 1336022417. It was assigned to this individual provider in the NPPES registry on July 28, 2025.
Where is Callie Williams located?
Callie Williams practices at 6565 N Charles St, Towson, MD 21204. The listed phone number is (443) 849-3400.
What is Callie Williams's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Callie Williams enrolled in Medicare?
Yes. Callie Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Callie Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Callie Williams reassigns Medicare benefits to Greater Baltimore Medical Center, Inc. (Baltimore, MD). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Callie Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Callie Williams affiliated with any hospitals?
According to CMS data, Callie Williams is affiliated with Greater Baltimore Medical Center.
When was this NPI record last updated?
The NPPES record for Callie Williams was last updated on January 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Callie Elizabeth Williams, DNP, AGNP-C · NPI 1336022417
Nurse Practitioner physician in Towson, Maryland. Individual provider, active in the CMS NPPES registry since July 28, 2025.
## Identity
- **NPI:** 1336022417 (Entity type: Individual)
- **Enumerated:** July 28, 2025
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** R242805 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 6565 N CHARLES ST, Towson, MD 21204-6800
- **Phone:** (443) 849-3400
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Greater Baltimore Medical Center, Inc. (NPI 1013739382, Baltimore, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2025
## Record status
- **NPPES last updated:** January 22, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1336022417) · Data from the CMS NPPES public registry.