JASON MILES CASTANEDA MD
NPI 1891372587
Hospitalist in Seattle, WA
About Jason Miles Castaneda Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JASON MILES CASTANEDA MD (NPI 1891372587) is an individual hospitalist provider in Seattle, Washington, licensed in Washington (MD61458667) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Jason Miles Castaneda Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Jason Castaneda reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 267 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 98104 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.
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 Jason Castaneda's NPI number?
The NPI number for Jason Castaneda is 1891372587. It was assigned to this individual provider in the NPPES registry on March 27, 2021.
Where is Jason Castaneda located?
Jason Castaneda practices at 325 9th Ave, Seattle, WA 98104. The listed phone number is (206) 520-5000.
What is Jason Castaneda's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Jason Castaneda enrolled in Medicare?
Yes. Jason Castaneda is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Jason Castaneda's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jason Castaneda reassigns Medicare benefits to Harborview Medical Center (Seattle, 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 Jason Castaneda'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 Jason Castaneda was last updated on May 9, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Jason Miles Castaneda, MD · NPI 1891372587
Hospitalist physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since March 27, 2021.
## Identity
- **NPI:** 1891372587 (Entity type: Individual)
- **Enumerated:** March 27, 2021
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** MD61458667 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 325 9TH AVE, Seattle, WA 98104-2420
- **Phone:** (206) 520-5000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Harborview Medical Center (NPI 1568557312, Seattle, WA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** May 9, 2024
---
Source: [NPI Profile](https://npiprofile.com/npi/1891372587) · Data from the CMS NPPES public registry.