Quick answers
- Does Mary G. Walter accept Medicare assignment?
- Yes. Medicare's clinician data says Mary G. Walter accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Mary G. Walter see?
- In 2024, CMS data shows 134 Original Medicare patients and 597 services for Mary G. Walter. This counts Original Medicare only and measures volume, not quality.
- What is Mary G. Walter's NPI number?
- 1023449642. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Mary G. Walter, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 134 |
|---|---|
| Services billed to Medicare | 597 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 58 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)271 services
- Injection of drug or substance under skin or into muscle (96372)183 services
- Psychotherapy, 45 minutes (90834)43 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)34 services
- Psychotherapy, 1 hour (90837)22 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol68%
- High blood pressure66%
- Anxiety63%
- Depression60%
- Arthritis40%
- Diabetes37%
Hospitals where Mary G. Walter works
Medicare's Facility Affiliation Data lists Mary G. Walter at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Calverthealth Medical CenterPrince Frederick, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210039
Practice locations
Addresses where Mary G. Walter is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 Hospital RdPrince Frederick, MD 20678 (410) 938‑3367
- 975 Solomons Island Rd N, Suite 119Prince Frederick, MD 20678
Group practices
Medicare enrollment lists Mary G. Walter as a member of these groups (CMS data updated October 2, 2026).
- Sheppard Pratt Physicians PA67 clinicians in the group
- Calvert County Health Department19 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Prince Frederick
Clinicians with the same Medicare primary specialty in Prince Frederick, MD — not a recommendation.
Other clinicians in Sheppard Pratt Physicians PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2013 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1023449642 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians