DR. WOOIN AHN M.D.
NPI 1366608267
Internal Medicine - Nephrology in Portland, OR
About Dr. Wooin Ahn M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WOOIN AHN M.D. (NPI 1366608267) is an individual nephrology provider in Portland, Oregon, licensed in Oregon (MD213267) and active in the NPI registry since July 2008. He is enrolled in Medicare PECOS, is affiliated with Ohsu Hospital And Clinics, and maintains a secondary practice location in New York.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
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. Wooin Ahn M.d. 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 Wooin Ahn 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
Astoria, OR 97103
- Reassigned Medicare billing, Oregon enrollment
- Also billed through NPI 1134146939 (Oregon)
- 278 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.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ohsu Hospital And Clinics
Acute Care Hospitals · Portland, ORHillsboro Medical Center
Acute Care Hospitals · Hillsboro, ORAdventist Health Portland
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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Wooin Ahn's NPI number?
The NPI number for Wooin Ahn is 1366608267. It was assigned to this individual provider in the NPPES registry on July 31, 2008.
Where is Wooin Ahn located?
Wooin Ahn practices at 3181 SW Sam Jackson Park Rd, Portland, OR 97239. The listed phone number is (503) 494-3442.
What is Wooin Ahn's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Wooin Ahn enrolled in Medicare?
Yes. Wooin Ahn 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 Wooin Ahn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Wooin Ahn reassigns Medicare benefits to 2 organizations: University Professional Services (Portland, OR) and Columbia Lutheran Charities (Astoria, 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 Wooin Ahn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Wooin Ahn accept?
Health plans from Moda Health Plan, Inc., PacificSource Health Plans and Providence Health Plan list Wooin Ahn as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Wooin Ahn affiliated with any hospitals?
According to CMS data, Wooin Ahn is affiliated with Ohsu Hospital And Clinics, Hillsboro Medical Center and Adventist Health Portland.
When was this NPI record last updated?
The NPPES record for Wooin Ahn was last updated on June 30, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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. Wooin Ahn, M.D. · NPI 1366608267
Nephrology physician in Portland, Oregon. Individual provider, active in the CMS NPPES registry since July 31, 2008.
## Identity
- **NPI:** 1366608267 (Entity type: Individual)
- **Enumerated:** July 31, 2008
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** MD213267 (Oregon)
- **Sole proprietor:** No
## Practice location
- **Address:** 3181 SW SAM JACKSON PARK RD, Portland, OR 97239-3011
- **Phone:** (503) 494-3442 · **Fax:** (503) 494-5330
## 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); Columbia Lutheran Charities (NPI 1700809761, Astoria, OR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1998
## Record status
- **NPPES last updated:** June 30, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1366608267) · Data from the CMS NPPES public registry.