DR. MACKENZIE RAINIER COOK MD
NPI 1497070486
Surgery - Surgical Critical Care in Longview, WA
About Dr. Mackenzie Rainier Cook Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MACKENZIE RAINIER COOK MD (NPI 1497070486) is an individual surgical critical care provider in Longview, Washington, licensed in Oregon (MD184572) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS, maintains 4 additional practice locations, and is a graduate of Duke University School Of Medicine (2010).
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 4
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Mackenzie Rainier Cook Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Mackenzie Cook reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Longview, WA 98632
- Reassigned Medicare billing, Washington enrollment
- 308 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 7
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
LONGVIEW, WA 98632
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 Mackenzie Cook's NPI number?
The NPI number for Mackenzie Cook is 1497070486. It was assigned to this individual provider in the NPPES registry on April 1, 2010.
Where is Mackenzie Cook located?
Mackenzie Cook practices at 1615 Delaware St, Longview, WA 98632. The listed phone number is (360) 501-3500.
What is Mackenzie Cook's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Surgical Critical Care, with taxonomy code 2086S0102X.
Is Mackenzie Cook enrolled in Medicare?
Yes. Mackenzie Cook is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Mackenzie Cook's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mackenzie Cook reassigns Medicare benefits to Peacehealth (Longview, WA). The 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 Mackenzie Cook's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mackenzie Cook accept?
Health plans from Ambetter Health, Moda Health Plan, Inc. and Premera Blue Cross Blue Shield of Alaska list Mackenzie Cook 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 Mackenzie Cook was last updated on September 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 45 days 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.
# Dr. Mackenzie Rainier Cook, MD · NPI 1497070486
Surgical Critical Care physician in Longview, Washington. Individual provider, active in the CMS NPPES registry since April 1, 2010.
## Identity
- **NPI:** 1497070486 (Entity type: Individual)
- **Enumerated:** April 1, 2010
- **Primary specialty:** Surgery - Surgical Critical Care · taxonomy 2086S0102X
- **State license:** MD184572 (Oregon)
- **Sole proprietor:** No
## Practice location
- **Address:** 1615 DELAWARE ST, Longview, WA 98632-2367
- **Phone:** (360) 501-3500 · **Fax:** (360) 501-3555
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Peacehealth (NPI 1720056187, Longview, WA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Duke University School Of Medicine, class of 2010
## Record status
- **NPPES last updated:** September 22, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1497070486) · Data from the CMS NPPES public registry.