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CHELSEA R TIESZEN MD, MS
NPI 1518200377
Internal Medicine - Geriatric Medicine in Portland, OR

Active since March 30, 2013PECOS Enrolled
17727 E BURNSIDE ST, PORTLAND, OR 97233(503) 215-9800 Get Directions Write a Review

NPPES record last updated: October 25, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 26, 2022, Sep 30, 2020 (2 updates tracked since 2020).

About Chelsea R Tieszen Md, Ms NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

CHELSEA R TIESZEN MD, MS (NPI 1518200377) is an individual geriatric medicine provider in Portland, Oregon, licensed in Oregon (MD182564) and active in the NPI registry since March 2013. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1518200377
Entity TypeIndividualFemale
Primary Taxonomy207RG0300X
Provider Legal NameCHELSEA R TIESZENCredential: MD, MS
Location Address17727 E BURNSIDE STPortland, OR 97233-4803
Mailing Address17727 E Burnside StPortland, OR 97233-4803
Phone(503) 215-9800
Sole ProprietorNo
Enumeration DateMarch 30, 2013
Last NPPES UpdateOctober 25, 20242 updates tracked since enumeration
NPPES CertifiedOctober 25, 2024
✔ NPI 1518200377 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Geriatric MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207RG0300X
License✔ Licensed in OR · MD182564
Definition
An internist who has special knowledge of the aging process and special skills in the diagnostic, therapeutic, preventive and rehabilitative aspects of illness in the elderly. This specialist cares for geriatric patients in the patient's home, the office, long-term care settings such as nursing homes and the hospital.
Also ListedInternal MedicineTaxonomy 207R00000X · License MD182564 (OR)
17727 E BURNSIDE ST, Portland, OR 97233
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Kaiser Permanente.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Chelsea R Tieszen Md, Ms is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Chelsea Tieszen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Sapphire At Gresham Rehab, LLC
3.0 mi
Skilled Nursing Facility
405 NE 5TH ST
Gresham, OR 97030
  • 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
NPI 1033740899 (503) 666-5600
Providence Health & Services - Oregon
6.4 mi
General Acute Care Hospital
4805 NE GLISAN ST
Portland, OR 97213
  • Reassigned Medicare billing, Oregon enrollment
  • 676 clinicians in this Medicare group
NPI 1003991845 (503) 451-3000

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 97233 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$176.88 typical visit price
range $58.99 – $176.88
Typical copayment $44.22 (range $14.74 – $44.22)
Most-billed visit code 99205
Established Patient
$103.51 typical visit price
range $19.32 – $144.79
Typical copayment $25.87 (range $4.83 – $36.19)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

THERESA RENEE SEIFER RN
Registered Nurse (Gerontology)
17727 E BURNSIDE ST
PORTLAND, OR 97233
Multnomah County (503) 215-9800
BECKET N. LAUTEN MSW, LCSW
Social Worker (Clinical)
17727 E BURNSIDE ST
PORTLAND, OR 97233
Multnomah County (503) 215-9803
MISS CLAUDIA NONE FONG
Licensed Practical Nurse
17727 E BURNSIDE ST
PORTLAND, OR 97233
Multnomah County (503) 215-9800
LYDIA LOUISE RIVERA MSW, CSWA
Social Worker
17727 E BURNSIDE ST
PORTLAND, OR 97233
Multnomah County (503) 215-9800
DR. KELLIE ROONEY FOSTER M.D.
Internal Medicine (Geriatric Medicine)
17727 E BURNSIDE ST
PORTLAND, OR 97233
Multnomah County (503) 215-9800
MRS. SAMANTHA LOUISE MACDONALD RN
Registered Nurse
17727 E BURNSIDE ST
PORTLAND, OR 97233
Multnomah County (503) 215-9807
DONNA L JOHANNES ANP, GNP
Nurse Practitioner (Gerontology)
17727 E BURNSIDE ST
PORTLAND, OR 97233
Multnomah County (503) 215-9800
MS. CRYSTAL DAWN STONE RD
Dietitian, Registered
17727 E BURNSIDE ST
PORTLAND, OR 97233
Multnomah County (503) 215-9800

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 Chelsea Tieszen's NPI number?

The NPI number for Chelsea Tieszen is 1518200377. It was assigned to this individual provider in the NPPES registry on March 30, 2013.

Where is Chelsea Tieszen located?

Chelsea Tieszen practices at 17727 E Burnside St, Portland, OR 97233. The listed phone number is (503) 215-9800.

What is Chelsea Tieszen's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.

Is Chelsea Tieszen enrolled in Medicare?

Yes. Chelsea Tieszen is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Chelsea Tieszen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Chelsea Tieszen reassigns Medicare benefits to 2 organizations: Sapphire At Gresham Rehab, LLC (Gresham, 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 Chelsea Tieszen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Chelsea Tieszen accept?

Health plans from Kaiser Permanente list Chelsea Tieszen 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.

When was this NPI record last updated?

The NPPES record for Chelsea Tieszen was last updated on October 25, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 months 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.