DR. ISLA MARIANN MCKERROW JOHNSON MD
NPI 1417585571
Internal Medicine - Hematology & Oncology in Spokane Valley, WA
About Dr. Isla Mariann Mckerrow Johnson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ISLA MARIANN MCKERROW JOHNSON MD (NPI 1417585571) is an individual hematology & oncology provider in Spokane Valley, Washington, licensed in Minnesota (70741) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS, is affiliated with Mayo Clinic Hospital Rochester, and is a graduate of Oregon Health Sciences University School Of Medicine (2020).
NPPES Registry Identity
Specialties & Licenses
Accepted 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
Dr. Isla Mariann Mckerrow Johnson Md 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.
Medicare Billing Reassignments
2Medicare enrollment records show Isla Johnson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Spokane Valley, WA 99216
- Reassigned Medicare billing, Washington enrollment
- 42 clinicians in this Medicare group
Rochester, MN 55905
- Reassigned Medicare billing, Minnesota enrollment
- 6,534 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 3
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mayo Clinic Hospital Rochester
Acute Care Hospitals · Rochester, MNPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 99216 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 18
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SPOKANE VALLEY, WA 99216
SPOKANE VALLEY, WA 99216
SPOKANE VALLEY, WA 99216
SPOKANE VALLEY, WA 99216
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 Johnson's NPI number?
The NPI number for Isla Johnson is 1417585571. It was assigned to this individual provider in the NPPES registry on April 1, 2020.
Where is Isla Johnson located?
Isla Johnson practices at 1204 N Vercler Rd, Spokane Valley, WA 99216. The listed phone number is (503) 504-3402.
What is Isla Johnson's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Isla Johnson enrolled in Medicare?
Yes. Isla Johnson 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 Johnson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Isla Johnson reassigns Medicare benefits to 2 organizations: Cancer Care Northwest Centers P S (Spokane Valley, WA) and Mayo Clinic (Rochester, MN). 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 Johnson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Isla Johnson accept?
Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Isla Johnson 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.
Is Isla Johnson affiliated with any hospitals?
According to CMS data, Isla Johnson is affiliated with Mayo Clinic Hospital Rochester.
When was this NPI record last updated?
The NPPES record for Isla Johnson was last updated on September 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 33 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. Isla Mariann Mckerrow Johnson, MD · NPI 1417585571
Hematology & Oncology physician in Spokane Valley, Washington. Individual provider, active in the CMS NPPES registry since April 1, 2020.
## Identity
- **NPI:** 1417585571 (Entity type: Individual)
- **Enumerated:** April 1, 2020
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** 70741 (Minnesota)
- **Sole proprietor:** No
## Practice location
- **Address:** 1204 N VERCLER RD, Spokane Valley, WA 99216-1020
- **Phone:** (503) 504-3402
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Cancer Care Northwest Centers P S (NPI 1922072081, Spokane Valley, WA); Mayo Clinic (NPI 1114343860, Rochester, MN) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Oregon Health Sciences University School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** September 17, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1417585571) · Data from the CMS NPPES public registry.