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COURTNEY ELIZABETH CHERNIAK NP
NPI 1891266185
Nurse Practitioner in Palo Alto, CA

Active since December 11, 2018PECOS Enrolled
725 WELCH RD, PALO ALTO, CA 94304(650) 497-8000 Get Directions Write a Review

NPPES record last updated: May 20, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 20, 2025, Aug 28, 2023, Mar 1, 2019 and 1 more (4 updates tracked since 2018).

About Courtney Elizabeth Cherniak Np NPPES

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

COURTNEY ELIZABETH CHERNIAK NP (NPI 1891266185) is an individual nurse practitioner in Palo Alto, California, licensed in California (95023187) and active in the NPI registry since December 2018. She is enrolled in Medicare PECOS and maintains a secondary practice location in Ann Arbor.

NPPES Registry Identity

NPI1891266185
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameCOURTNEY ELIZABETH CHERNIAKCredential: NP
Location Address725 WELCH RDPalo Alto, CA 94304-1601
Mailing Address725 Welch RdPalo Alto, CA 94304-1601 · (650) 497-8000
Phone(650) 497-8000
Sole ProprietorNo
Enumeration DateDecember 11, 2018
Last NPPES UpdateMay 20, 20254 updates tracked since enumeration
NPPES CertifiedMay 20, 2025
✔ NPI 1891266185 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363L00000X
Licenses✔ Licensed in CA · 95023187✔ Licensed in MI · 4704280733
Definition
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
Also ListedNurse Practitioner · Pediatrics, Critical CareTaxonomy 363LP0222X · License 4704280733 (MI)
725 WELCH RD, Palo Alto, CA 94304
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Other Names 1

Former Name (1)Courtney Cherniak Cpnp-ac

Secondary Practice Location 1

Location 11500 East Medical Center Dr, 10th floor C.S. Mott Children's HospitalAnn Arbor, MI 48109-4286 · Phone (734) 764-5302

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Courtney Elizabeth Cherniak Np is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Medicare Billing Reassignments

2

Medicare enrollment records show Courtney Cherniak reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Lpch Medical Group Div Of Lucile
Same address
Children
725 WELCH RD
Palo Alto, CA 94304
  • Reassigned Medicare billing, California enrollment
  • 3,617 clinicians in this Medicare group
NPI 1417907940 (650) 498-6762
Stanford Health Care
0.2 mi
General Acute Care Hospital
300 PASTEUR DRIVE
Stanford, CA 94305
  • Reassigned Medicare billing, California enrollment
  • 4,258 clinicians in this Medicare group
NPI 1437292927 (650) 723-4000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94304 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
$121.77 typical visit price
range $23.96 – $169.60
Typical copayment $30.44 (range $5.99 – $42.40)
Most-billed visit code 99214
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.

EIRI INENAGA MS, OTR/L
Occupational Therapist (Pediatrics)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8218
WENDY LEIGH ADAMS ARNP
Nurse Practitioner (Neonatal)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
KEVIN WEI-HAN CHI MD
Pediatrics
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
ASHEEN RAMA MD
Anesthesiology (Pediatric Anesthesiology)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
CRYSTAL LEE MACKALL MD
Pediatrics (Pediatric Hematology-Oncology)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
KRISTI LYNNE O'CONNOR OT
Occupational Therapist
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
LAUREN GENNA ROOS NP
Nurse Practitioner
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
SHALINI MITTAL MD
Hospitalist
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000

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 Courtney Cherniak's NPI number?

The NPI number for Courtney Cherniak is 1891266185. It was assigned to this individual provider in the NPPES registry on December 11, 2018. The provider is also known as Courtney Cherniak Cpnp-Ac.

Where is Courtney Cherniak located?

Courtney Cherniak practices at 725 Welch Rd, Palo Alto, CA 94304. The listed phone number is (650) 497-8000.

What is Courtney Cherniak's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Is Courtney Cherniak enrolled in Medicare?

Yes. Courtney Cherniak is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Courtney Cherniak's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Courtney Cherniak reassigns Medicare benefits to 2 organizations: Lpch Medical Group Div Of Lucile (Palo Alto, CA) and Stanford Health Care (Stanford, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Courtney Cherniak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Courtney Cherniak accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan and Ambetter from Meridian list Courtney Cherniak as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Courtney Cherniak was last updated on May 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.