MS. MARY GORDON WALTER RN/NP, PMHNP-BC
NPI 1023449642
Nurse Practitioner - Psychiatric/Mental Health in Prince Frederick, MD
About Ms. Mary Gordon Walter Rn/np, Pmhnp-bc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. MARY GORDON WALTER RN/NP, PMHNP-BC (NPI 1023449642) is an individual psychiatric/mental health provider in Prince Frederick, Maryland, licensed in Maryland (R217581) and active in the NPI registry since December 2013. She is enrolled in Medicare PECOS, is affiliated with Calverthealth Medical Center, and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses 2
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
Ms. Mary Gordon Walter Rn/np, Pmhnp-bc 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 Reassignments
3Medicare enrollment records show Mary Walter reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Prince Frederick, MD 20678
- Reassigned Medicare billing, Maryland enrollment
- 25 clinicians in this Medicare group
Silver Spring, MD 20910
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 128 clinicians in this Medicare group
Baltimore, MD 21204
- Reassigned Medicare billing, Maryland enrollment
- Medicare enrollment name: Sheppard Pratt Physicians PA
- 187 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.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Calverthealth Medical Center
Acute Care Hospitals · Prince Frederick, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20678 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Mary Walter's NPI number?
The NPI number for Mary Walter is 1023449642. It was assigned to this individual provider in the NPPES registry on December 7, 2013.
Where is Mary Walter located?
Mary Walter practices at 976 Solomans Island Road, Prince Frederick, MD 20678. The listed phone number is (410) 535-5400.
What is Mary Walter's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.
Is Mary Walter enrolled in Medicare?
Yes. Mary Walter 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 organizations bill Medicare for Mary Walter's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Walter reassigns Medicare benefits to 3 organizations: Calvert County Health Department (Prince Frederick, MD), Axis Healthcare Group (Silver Spring, MD) and Sheppard Pratt Physicians, P.A. (Baltimore, MD). Each 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 Mary Walter's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mary Walter affiliated with any hospitals?
According to CMS data, Mary Walter is affiliated with Calverthealth Medical Center.
When was this NPI record last updated?
The NPPES record for Mary Walter was last updated on September 29, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years 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.
# Ms. Mary Gordon Walter, RN/NP, PMHNP-BC · NPI 1023449642
Psychiatric/Mental Health physician in Prince Frederick, Maryland. Individual provider, active in the CMS NPPES registry since December 7, 2013.
## Identity
- **NPI:** 1023449642 (Entity type: Individual)
- **Enumerated:** December 7, 2013
- **Primary specialty:** Nurse Practitioner - Psychiatric/Mental Health · taxonomy 363LP0808X
- **State license:** R217581 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 976 SOLOMANS ISLAND ROAD, Prince Frederick, MD 20678
- **Phone:** (410) 535-5400
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Calvert County Health Department (NPI 1609137918, Prince Frederick, MD); Axis Healthcare Group (NPI 1326295098, Silver Spring, MD); Sheppard Pratt Physicians, P.A. (NPI 1518990712, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** September 29, 2015
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Source: [NPI Profile](https://npiprofile.com/npi/1023449642) · Data from the CMS NPPES public registry.