MA HAZELENE MERLUZA PAREJA PA-C
NPI 1427786276
Physician Assistant in Stanford, CA

Active since August 10, 2022PECOS EnrolledAccepts Medicare Assignment
300 PASTEUR DR, STANFORD, CA 94305(650) 723-4000 Get Directions Write a Review

NPPES record last updated: November 11, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Nov 11, 2025, May 16, 2025, Aug 10, 2022 (3 updates tracked since 2022).

About Ma Hazelene Merluza Pareja Pa-c NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MA HAZELENE MERLUZA PAREJA PA-C (NPI 1427786276) is an individual physician assistant in Stanford, California, licensed in California (61658) and active in the NPI registry since August 2022. She is enrolled in Medicare PECOS, maintains a secondary practice location in Redwood City, and is a graduate of Other (2022).

NPPES Registry Identity

NPI1427786276
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameMA HAZELENE MERLUZA PAREJACredential: PA-C
Location Address300 PASTEUR DRStanford, CA 94305-2200
Mailing Address300 Pasteur DrStanford, CA 94305-2200 · (650) 723-4000
Sole ProprietorNo
Medical School CMSOtherGraduated 2022
Enumeration DateAugust 10, 2022
Last NPPES UpdateNovember 11, 20253 updates tracked since enumeration
NPPES CertifiedNovember 11, 2025
NPI 1427786276 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License Licensed in CA · 61658
Definition

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

300 PASTEUR DR, Stanford, CA 94305

Other Names 1

Other Name (5)Hazelene Merluza Pa-c

Secondary Practice Location 1

Location 12900 Whipple Ave Ste 132Redwood City, CA 94062-2844 · Phone (650) 306-1016 · Fax (650) 216-9403

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Enrolled in Medicare and accepts Medicare assignment

Ma Hazelene Merluza Pareja Pa-c 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.

PECOS PAC ID1456721547
PECOS Enrollment IDI20230106000394
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94305 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$106.47 typical visit price
range $70.37 – $206.04
Typical copayment $26.61 (range $17.59 – $51.51)
Most-billed visit code 99203
Established Patient
$86.56 typical visit price
range $23.96 – $169.60
Typical copayment $21.64 (range $5.99 – $42.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Internal Medicine (Gastroenterology)
300 PASTEUR DR, ALWAY BUILD M211, MC 5187
STANFORD, CA 94305
Radiology (Vascular & Interventional Radiology)
300 PASTEUR DR
STANFORD, CA 94305
Psychiatry & Neurology (Psychiatry)
300 PASTEUR DR
STANFORD, CA 94305
Radiology (Diagnostic Radiology)
300 PASTEUR DR
STANFORD, CA 94305
Nurse Practitioner
300 PASTEUR DR
STANFORD, CA 94305
Neurological Surgery
300 PASTEUR DR
STANFORD, CA 94305
Pathology (Anatomic Pathology & Clinical Pathology)
300 PASTEUR DR, LANE 235
STANFORD, CA 94305
Internal Medicine (Critical Care Medicine)
300 PASTEUR DR
STANFORD, CA 94305

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 Ma Hazelene Pareja's NPI number?

The NPI number for Ma Hazelene Pareja is 1427786276. It was assigned to this individual provider in the NPPES registry on August 10, 2022. The provider is also known as Hazelene Merluza Pa-C.

Where is Ma Hazelene Pareja located?

Ma Hazelene Pareja practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.

What is Ma Hazelene Pareja's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Ma Hazelene Pareja enrolled in Medicare?

Yes. Ma Hazelene Pareja 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.

When was this NPI record last updated?

The NPPES record for Ma Hazelene Pareja was last updated on November 11, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.