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ISLA SAGE OLIVER CNM
NPI 1326766056
Advanced Practice Midwife in Everett, WA

Active since August 18, 2022PECOS EnrolledAccepts Medicare Assignment
2918 COLBY AVE STE 206, EVERETT, WA 98201(425) 654-1376(229) 212-4372 Get Directions Write a Review

NPPES record last updated: June 4, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 4, 2026, May 6, 2026, May 30, 2025 and 2 more (5 updates tracked since 2022).

About Isla Sage Oliver Cnm NPPES

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

ISLA SAGE OLIVER CNM (NPI 1326766056) is an individual advanced practice midwife in Everett, Washington, licensed in Washington (AP61469789) and active in the NPI registry since August 2022. She is enrolled in Medicare PECOS, maintains a secondary practice location in Everett, and is a graduate of Other (2023).

NPPES Registry Identity

NPI1326766056
Entity TypeIndividualFemale
Primary Taxonomy367A00000X
Provider Legal NameISLA SAGE OLIVERCredential: CNM
Location Address2918 COLBY AVE STE 206Everett, WA 98201-4077
Mailing Address2918 Colby Ave Ste 206Everett, WA 98201-4077 · (425) 654-1376 · Fax (229) 212-4372
Phone(425) 654-1376
Fax(229) 212-4372
Sole ProprietorNo
Medical School CMSOtherGraduated 2023
Enumeration DateAugust 18, 2022
Last NPPES UpdateJune 4, 20265 updates tracked since enumeration
NPPES CertifiedJune 4, 2026
✔ NPI 1326766056 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAdvanced Practice MidwifePhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code367A00000X
Licenses✔ Licensed in WA · AP61469789✔ Licensed in WA · RN61084888
Definition
Advanced practice midwifery encompasses the independent provision of care during pregnancy, childbirth, and the postpartum period; sexual and reproductive health; gynecologic health; and family planning services, including preconception care. Midwives also provide primary care for individuals from adolescence throughout the lifespan as well as care for the healthy newborn during the first 28 days of life. Midwives provide initial and ongoing comprehensive assessment, diagnosis, and treatment. Midwifery care includes health promotion, disease prevention, risk assessment and management, and individualized wellness education and counseling. Source: American College of Nurse-Midwives, www.midwife.org Additional Resources: See the American College of Nurse-Midwives, www.midwife.org, for more information on Certified Nurse-Midwives, Certified Midwives, the American Midwifery Certification Board (AMCB), and licensure.
2918 COLBY AVE STE 206, Everett, WA 98201
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Other Names 1

Former Name (1)Isla Sage Cook-biggert

Secondary Practice Location 1

Location 1900 Pacific Ave Ste 500Everett, WA 98201-4189 · Phone (425) 339-5430 · Fax (425) 339-5454

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Premera Blue Cross Blue Shield of Alaska, Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Isla Sage Oliver Cnm 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 ID1951832716
PECOS Enrollment IDI20241003001963
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 Isla Oliver reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Optum Care Washington PLLC
0.9 mi
Multi-Specialty
3901 HOYT AVE
Everett, WA 98201
  • Reassigned Medicare billing, Washington enrollment
  • 1,285 clinicians in this Medicare group
NPI 1831186766 (425) 259-0966
The Polyclinic PLLC
26 mi
Audiologist
1145 BROADWAY
Seattle, WA 98122
  • Reassigned Medicare billing, Washington enrollment
  • 911 clinicians in this Medicare group
NPI 1174594634 (206) 329-1760

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 98201 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
$88.29 typical visit price
range $57.27 – $172.80
Typical copayment $22.07 (range $14.31 – $43.20)
Most-billed visit code 99203
Established Patient
$71.29 typical visit price
range $18.56 – $141.11
Typical copayment $17.82 (range $4.64 – $35.27)
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.

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 Isla Oliver's NPI number?

The NPI number for Isla Oliver is 1326766056. It was assigned to this individual provider in the NPPES registry on August 18, 2022. The provider is also known as Isla Sage Cook-Biggert.

Where is Isla Oliver located?

Isla Oliver practices at 2918 Colby Ave Ste 206, Everett, WA 98201. The listed phone number is (425) 654-1376.

What is Isla Oliver's specialty?

The primary specialty registered for this NPI is Advanced Practice Midwife with taxonomy code 367A00000X.

Is Isla Oliver enrolled in Medicare?

Yes. Isla Oliver 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.

Which organizations bill Medicare for Isla Oliver's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Isla Oliver reassigns Medicare benefits to 2 organizations: Optum Care Washington PLLC (Everett, WA) and The Polyclinic PLLC (Seattle, WA). 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 Isla Oliver's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Isla Oliver accept?

Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Isla Oliver 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 Isla Oliver was last updated on June 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.