DENNIS CHAN TAN M.D.
NPI 1457577983
Obstetrics & Gynecology in Milwaukie, OR
About Dennis Chan Tan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DENNIS CHAN TAN M.D. (NPI 1457577983) is an individual obstetrics & gynecology provider in Milwaukie, Oregon, licensed in Oregon (MD27355) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS, is affiliated with Providence Milwaukie Hospital, and maintains a secondary practice location in Happy Valley.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 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
Dennis Chan Tan 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
5Medicare enrollment records show Dennis Tan reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Milwaukie, OR 97222
- Reassigned Medicare billing, Oregon enrollment
- 1,501 clinicians in this Medicare group
Milwaukie, OR 97222
- Reassigned Medicare billing, Oregon enrollment
- 229 clinicians in this Medicare group
Portland, OR 97213
- Reassigned Medicare billing, Oregon enrollment
- 676 clinicians in this Medicare group
Oregon City, OR 97045
- Reassigned Medicare billing, Oregon enrollment
- 206 clinicians in this Medicare group
Mt Hood, OR 97041
- Reassigned Medicare billing, Oregon enrollment
- Medicare enrollment name: Providence Health & Services Oregon
- 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Providence Milwaukie Hospital
Acute Care Hospitals · Milwaukie, ORPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 97222 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 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MILWAUKIE, OR 97222
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 Dennis Tan's NPI number?
The NPI number for Dennis Tan is 1457577983. It was assigned to this individual provider in the NPPES registry on April 17, 2007.
Where is Dennis Tan located?
Dennis Tan practices at 10330 SE 32nd Ave Ste 305, Milwaukie, OR 97222. The listed phone number is (503) 513-1800.
What is Dennis Tan's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Dennis Tan enrolled in Medicare?
Yes. Dennis Tan 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 Dennis Tan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Dennis Tan reassigns Medicare benefits to 5 organizations: Providence Health & Services - Oregon (Milwaukie, OR), Providence Health & Services Oregon (Milwaukie, OR), Providence Health & Services - Oregon (Portland, OR), Providence Health & Services - Oregon (Oregon City, OR) and Providence Hood River Memorial Hospital (Mt Hood, 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 Dennis Tan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Dennis Tan accept?
Health plans from Providence Health Plan list Dennis Tan 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 Dennis Tan affiliated with any hospitals?
According to CMS data, Dennis Tan is affiliated with Providence Milwaukie Hospital.
When was this NPI record last updated?
The NPPES record for Dennis Tan was last updated on March 25, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Dennis Chan Tan, M.D. · NPI 1457577983
Obstetrics & Gynecology physician in Milwaukie, Oregon. Individual provider, active in the CMS NPPES registry since April 17, 2007.
## Identity
- **NPI:** 1457577983 (Entity type: Individual)
- **Enumerated:** April 17, 2007
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** MD27355 (Oregon)
- **Sole proprietor:** No
## Practice location
- **Address:** 10330 SE 32ND AVE STE 305, Milwaukie, OR 97222-6596
- **Phone:** (503) 513-1800
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Providence Health & Services - Oregon (NPI 1013086875, Milwaukie, OR); Providence Health & Services Oregon (NPI 1366536963, Milwaukie, OR); Providence Health & Services - Oregon (NPI 1003991845, Portland, OR); Providence Health & Services - Oregon (NPI 1003368911, Oregon City, OR); Providence Hood River Memorial Hospital (NPI 1437355955, Mt Hood, OR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** March 25, 2021
- **Other identifiers:** Medicaid 274140 (OR)
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Source: [NPI Profile](https://npiprofile.com/npi/1457577983) · Data from the CMS NPPES public registry.