Mary Walter, RN/NP, PMHNP-BC
NPI 1023449642 · Psychiatric/Mental Health Nurse Practitioner · Prince Frederick, MD
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Walter, RN/NP, PMHNP-BC is a Psychiatric/Mental Health Nurse Practitioner provider in Prince Frederick, MD (NPI 1023449642).
Provider details
- NPI number
- 1023449642
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN/NP, PMHNP-BC
- Sex
- Female
- Sole proprietor
- No
- License
- RN2274139 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
568 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 271 | $76 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 183 | $12 |
| Psychotherapy, 45 Minutes90834 | 43 | $87 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 34 | $66 |
| Psychotherapy, 1 Hour90837 | 22 | $126 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 15 | $163 |
Typical Medicare-allowed amounts for these services range $12–$163 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 48 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Quetiapine Fumarate | 167 | 23 |
| Clonazepam | 139 | 15 |
| Hydroxyzine Pamoate | 122 | 20 |
| Trazodone Hcl | 103 | 20 |
| Fluoxetine Hcl | 101 | 11 |
| Aripiprazole | 99 | 13 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$471 across 25 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-12-07
- Last updated
- 2015-09-29
Frequently asked questions
- What is Mary Walter's NPI number?
- Mary Walter's National Provider Identifier (NPI) is 1023449642, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Walter's specialty?
- Mary Walter is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Walter located?
- Mary Walter's practice location on file with NPPES is 976 Solomans Island Road, Prince Frederick, MD 20678.
- What is Mary Walter's phone number?
- The practice phone number listed in the NPPES registry for Mary Walter is (410) 535-5400.
- Does Mary Walter accept Medicare?
- Mary Walter is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Walter's NPI active?
- Yes — Mary Walter's NPI (1023449642) is active in the NPPES registry as of the last update on 2015-09-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.