MASON C PAAS MD
NPI 1386215986
Hospitalist in Portland, OR
About Mason C Paas Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MASON C PAAS MD (NPI 1386215986) is an individual hospitalist provider in Portland, Oregon, licensed in Oregon (MD225581) and active in the NPI registry since July 2021. He is enrolled in Medicare PECOS, is affiliated with Providence St Vincent Medical Center, and maintains a secondary practice location in Portland.
NPPES Registry Identity
Specialties & Licenses 2
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
Mason C Paas 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 Mason Paas reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Portland, OR 97239
- Reassigned Medicare billing, Oregon enrollment
- 2,212 clinicians in this Medicare group
Portland, OR 97205
- Reassigned Medicare billing, Oregon enrollment
- 1,501 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Providence St Vincent Medical Center
Acute Care Hospitals · Portland, ORPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 97239 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.
PORTLAND, OR 97239
PORTLAND, OR 97239
PORTLAND, OR 97239
PORTLAND, OR 97239
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 Mason Paas's NPI number?
The NPI number for Mason Paas is 1386215986. It was assigned to this individual provider in the NPPES registry on July 5, 2021.
Where is Mason Paas located?
Mason Paas practices at 3181 SW Sam Jackson Park Rd, Portland, OR 97239. The listed phone number is (503) 494-1164.
What is Mason Paas's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Mason Paas enrolled in Medicare?
Yes. Mason Paas 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 Mason Paas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mason Paas reassigns Medicare benefits to 2 organizations: University Professional Services (Portland, OR) and Providence Health & Services - Oregon (Portland, OR). 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 Mason Paas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mason Paas affiliated with any hospitals?
According to CMS data, Mason Paas is affiliated with Providence St Vincent Medical Center.
When was this NPI record last updated?
The NPPES record for Mason Paas 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.
# Mason C Paas, MD · NPI 1386215986
Hospitalist physician in Portland, Oregon. Individual provider, active in the CMS NPPES registry since July 5, 2021.
## Identity
- **NPI:** 1386215986 (Entity type: Individual)
- **Enumerated:** July 5, 2021
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** MD225581 (Oregon)
- **Sole proprietor:** No
## Practice location
- **Address:** 3181 SW SAM JACKSON PARK RD, Portland, OR 97239-3011
- **Phone:** (503) 494-1164 · **Fax:** (503) 494-5502
## 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): University Professional Services (NPI 1376709535, Portland, OR); Providence Health & Services - Oregon (NPI 1235479643, Portland, OR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Kentucky College Of Medicine, class of 2022
## Record status
- **NPPES last updated:** September 17, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1386215986) · Data from the CMS NPPES public registry.