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, and ordering and referring status from the CMS PECOS system.
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Pullman Regional Hospital
Critical Access Hospitals · Pullman, 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.
Is Gregory Wallis affiliated with any hospitals?
According to CMS data, Gregory Wallis is affiliated with Pullman Regional 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 12 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
- **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.