Mary Angelyn Clark, MSN, APRN
NPI 1053887455 · Nurse Practitioner · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Angelyn Clark, MSN, APRN is a Nurse Practitioner provider in Walnut Creek, CA (NPI 1053887455).
Provider details
- NPI number
- 1053887455
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- MSN, APRN
- Sex
- Female
- Sole proprietor
- No
- License
- NP95009579 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
7 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
308 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 190 | $98 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 118 | $145 |
Typical Medicare-allowed amounts for these services range $98–$145 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetron Hcl | 48 | 39 |
| Prochlorperazine Maleate | 43 | 36 |
| Anastrozole | 34 | 18 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 30 | 25 |
| Dexamethasone | 27 | 21 |
| Hydroxyurea | 26 | 15 |
| Loperamide Hclbrand: Loperamide | 25 | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$593 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
- 2018-10-23
- Last updated
- 2025-10-09
- Certified
- 2025-10-09
Frequently asked questions
- What is Mary Angelyn Clark's NPI number?
- Mary Angelyn Clark's National Provider Identifier (NPI) is 1053887455, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Angelyn Clark's specialty?
- Mary Angelyn Clark is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Angelyn Clark located?
- Mary Angelyn Clark's practice location on file with NPPES is 177 La Casa Via Ste 390, Walnut Creek, CA 94598-6101.
- What is Mary Angelyn Clark's phone number?
- The practice phone number listed in the NPPES registry for Mary Angelyn Clark is (925) 692-5610.
- Does Mary Angelyn Clark accept Medicare?
- Mary Angelyn Clark is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Angelyn Clark's NPI active?
- Yes — Mary Angelyn Clark's NPI (1053887455) is active in the NPPES registry as of the last update on 2025-10-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.