DR. GREGORY WALLIS DO
NPI 1790308278
Emergency Medicine in Pullman, WA
About Dr. Gregory Wallis Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GREGORY WALLIS DO (NPI 1790308278) is an individual emergency medicine provider in Pullman, Washington, licensed in Washington (OP61426716) and active in the NPI registry since May 2020. He is enrolled in Medicare PECOS, is affiliated with Pullman Regional Hospital, and maintains a secondary practice location in Parker.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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. Gregory Wallis Do 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
10Medicare enrollment records show Gregory Wallis reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Pullman, WA 99163
- Reassigned Medicare billing, Washington enrollment
- 151 clinicians in this Medicare group
Colfax, WA 99111
- Reassigned Medicare billing, Washington enrollment
- 69 clinicians in this Medicare group
Ephrata, WA 98823
- Reassigned Medicare billing, Washington enrollment
- Medicare enrollment name: Grant County Public Hospital District No. 3
- 144 clinicians in this Medicare group
Chelan, WA 98816
- Reassigned Medicare billing, Washington enrollment
- Also billed through NPI 1578568853 (Washington)
- 154 clinicians in this Medicare group
Moapa, NV 89025
- Reassigned Medicare billing, Texas enrollment
- 143 clinicians in this Medicare group
Supai, AZ 86435
- Reassigned Medicare billing, Texas enrollment
- Medicare enrollment name: Dhhs Ihs Phoenix Area
- 210 clinicians in this Medicare group
Polacca, AZ 86042
- Reassigned Medicare billing, Texas enrollment
- 199 clinicians in this Medicare group
Havasu Lake, CA 92363
- Reassigned Medicare billing, Texas enrollment
- 208 clinicians in this Medicare group
Joplin, MO 64804
- Reassigned Medicare billing, Missouri enrollment
- 171 clinicians in this Medicare group
Neosho, MO 64850
- Reassigned Medicare billing, Missouri enrollment
- 53 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Pullman Regional Hospital
Critical Access Hospitals · Pullman, WALake Chelan Community Hospital
Critical Access Hospitals · Chelan, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 99163 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.
PULLMAN, WA 99163
PULLMAN, WA 99163
PULLMAN, WA 99163
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 Gregory Wallis's NPI number?
The NPI number for Gregory Wallis is 1790308278. It was assigned to this individual provider in the NPPES registry on May 19, 2020.
Where is Gregory Wallis located?
Gregory Wallis practices at 835 SE Bishop Blvd, Pullman, WA 99163. The listed phone number is (509) 332-2541.
What is Gregory Wallis's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Gregory Wallis enrolled in Medicare?
Yes. Gregory Wallis 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 Gregory Wallis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Wallis reassigns Medicare benefits to 10 organizations: Public Hospital District #1-A Of Whitman County (Pullman, WA), Public Hospital District No 3 Of Whitman County (Colfax, WA), Grant County Public Hospital District 3 (Ephrata, WA), Chelan County Public Hospital District No 2 (Chelan, WA), Irene Benn Medical Center (Moapa, NV) and 5 more organizations, listed in the Medicare section above. 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 Gregory Wallis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Gregory Wallis affiliated with any hospitals?
According to CMS data, Gregory Wallis is affiliated with Pullman Regional Hospital and Lake Chelan Community Hospital.
When was this NPI record last updated?
The NPPES record for Gregory Wallis was last updated on August 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Dr. Gregory Wallis, DO · NPI 1790308278
Emergency Medicine physician in Pullman, Washington. Individual provider, active in the CMS NPPES registry since May 19, 2020.
## Identity
- **NPI:** 1790308278 (Entity type: Individual)
- **Enumerated:** May 19, 2020
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** OP61426716 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 835 SE BISHOP BLVD, Pullman, WA 99163-5512
- **Phone:** (509) 332-2541
## 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:** 10 organizations under Medicare reassignment (form CMS-855R): Public Hospital District #1-A Of Whitman County (NPI 1366446767, Pullman, WA); Public Hospital District No 3 Of Whitman County (NPI 1922009448, Colfax, WA); Grant County Public Hospital District 3 (NPI 1134283930, Ephrata, WA); Chelan County Public Hospital District No 2 (NPI 1124438312, Chelan, WA); Irene Benn Medical Center (NPI 1841535317, Moapa, NV); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** August 5, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1790308278) · Data from the CMS NPPES public registry.