DR. REX KLEIN BAKER II MD
NPI 1891834891
Family Medicine in Salem, OR
About Dr. Rex Klein Baker Ii Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. REX KLEIN BAKER II MD (NPI 1891834891) is an individual family medicine provider in Salem, Oregon, licensed in Colorado (DR.0067328) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, maintains a secondary practice location in Denver, and is a graduate of University Of New Mexico School Of Medicine (2004).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
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. Rex Klein Baker Ii 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 Rex Baker reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Salem, OR 97317
- Reassigned Medicare billing, Oregon and Washington enrollments
- Medicare enrollment name: Kaiser Foundation Health Plan Of The Northwest
- Also billed through NPI 1871848457 (Washington)
- 3,207 clinicians in this Medicare group
Renton, WA 98057
- Reassigned Medicare billing, Washington enrollment
- 2,678 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 97305 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.
SALEM, OR 97305
SALEM, OR 97305
SALEM, OR 97305
SALEM, OR 97305
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 Rex Baker's NPI number?
The NPI number for Rex Baker is 1891834891. It was assigned to this individual provider in the NPPES registry on February 6, 2007. The provider is also known as Rex K Baker.
Where is Rex Baker located?
Rex Baker practices at 2400 Lancaster Dr NE, Salem, OR 97305. The listed phone number is (503) 361-5400.
What is Rex Baker's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Rex Baker enrolled in Medicare?
Yes. Rex Baker 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 Rex Baker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Rex Baker reassigns Medicare benefits to 2 organizations: South Salem Rehabilitation, LLC (Salem, OR) and Kaiser Foundation Health Plan Of Washington (Renton, WA). 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 Rex Baker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Rex Baker was last updated on August 29, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. Rex Klein Baker II, MD · NPI 1891834891
Family Medicine physician in Salem, Oregon. Individual provider, active in the CMS NPPES registry since February 6, 2007.
## Identity
- **NPI:** 1891834891 (Entity type: Individual)
- **Enumerated:** February 6, 2007
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** DR.0067328 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 2400 LANCASTER DR NE, Salem, OR 97305-1221
- **Phone:** (503) 361-5400
## 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): South Salem Rehabilitation, LLC (NPI 1215071998, Salem, OR); Kaiser Foundation Health Plan Of Washington (NPI 1124264577, Renton, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of New Mexico School Of Medicine, class of 2004
## Record status
- **NPPES last updated:** August 29, 2022
---
Source: [NPI Profile](https://npiprofile.com/npi/1891834891) · Data from the CMS NPPES public registry.