MS. CAROLINE ANNE ARNOLD MD
NPI 1811492739
Emergency Medicine in Walla Walla, WA
About Ms. Caroline Anne Arnold Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. CAROLINE ANNE ARNOLD MD (NPI 1811492739) is an individual emergency medicine provider in Walla Walla, Washington, licensed in Washington (MD61145396) and active in the NPI registry since March 2018. She is enrolled in Medicare PECOS, is affiliated with Providence St Mary Medical Center, and maintains a secondary practice location in Morehead.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Ms. Caroline Anne Arnold 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 Reassignment
Medicare enrollment records show Caroline Arnold reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Walla Walla, WA 99362
- Reassigned Medicare billing, Washington enrollment
- 276 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.
Providence St Mary Medical Center
Acute Care Hospitals · Walla Walla, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 99362 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WALLA WALLA, WA 99362
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 Caroline Arnold's NPI number?
The NPI number for Caroline Arnold is 1811492739. It was assigned to this individual provider in the NPPES registry on March 25, 2018.
Where is Caroline Arnold located?
Caroline Arnold practices at 401 W Poplar St, Walla Walla, WA 99362. The listed phone number is (509) 897-3320.
What is Caroline Arnold's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Caroline Arnold enrolled in Medicare?
Yes. Caroline Arnold 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 organization bills Medicare for Caroline Arnold's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Caroline Arnold reassigns Medicare benefits to Providence Health & Services - Washington (Walla Walla, 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 Caroline Arnold's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Caroline Arnold accept?
Health plans from Ambetter Health, Moda Health Plan, Inc. and Premera Blue Cross Blue Shield of Alaska list Caroline Arnold 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 Caroline Arnold affiliated with any hospitals?
According to CMS data, Caroline Arnold is affiliated with Providence St Mary Medical Center.
When was this NPI record last updated?
The NPPES record for Caroline Arnold was last updated on August 19, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.
# Ms. Caroline Anne Arnold, MD · NPI 1811492739
Emergency Medicine physician in Walla Walla, Washington. Individual provider, active in the CMS NPPES registry since March 25, 2018.
## Identity
- **NPI:** 1811492739 (Entity type: Individual)
- **Enumerated:** March 25, 2018
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** MD61145396 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 401 W POPLAR ST, Walla Walla, WA 99362-2846
- **Phone:** (509) 897-3320
## 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:** Providence Health & Services - Washington (NPI 1306097126, Walla Walla, WA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Arkansas College Of Medicine, class of 2018
## Record status
- **NPPES last updated:** August 19, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1811492739) · Data from the CMS NPPES public registry.