Ma Hazelene Pareja, PA-C
NPI 1427786276 · Physician Assistant · Stanford, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ma Hazelene Pareja, PA-C is a Physician Assistant provider in Stanford, CA (NPI 1427786276).
Provider details
- NPI number
- 1427786276
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- No
- License
- 61658 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
3 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Estradiol | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$673 across 18 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
Additional practice locations (1)
- 2900 Whipple Ave Ste 132Redwood City, CA 94062-2844Phone: (650) 306-1016Fax: (650) 216-9403
Registry dates
- Enumerated
- 2022-08-10
- Last updated
- 2025-11-11
- Certified
- 2025-11-11
Frequently asked questions
- What is Ma Hazelene Pareja's NPI number?
- Ma Hazelene Pareja's National Provider Identifier (NPI) is 1427786276, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ma Hazelene Pareja's specialty?
- Ma Hazelene Pareja is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Ma Hazelene Pareja located?
- Ma Hazelene Pareja's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Ma Hazelene Pareja's phone number?
- The practice phone number listed in the NPPES registry for Ma Hazelene Pareja is (650) 723-4000.
- Does Ma Hazelene Pareja accept Medicare?
- Ma Hazelene Pareja is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ma Hazelene Pareja's NPI active?
- Yes — Ma Hazelene Pareja's NPI (1427786276) is active in the NPPES registry as of the last update on 2025-11-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.