Chelsea R. Tieszen, MD, MS
Geriatric Medicine (Internal Medicine) Physician · Portland, OR
Chelsea R. Tieszen, MD, MS is a geriatric medicine (internal medicine) physician with a practice address in Portland, Oregon, and NPI 1518200377, issued on Mar 30, 2013. Check the license (Oregon MD182564, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Chelsea R. Tieszen
- Credential
- MD, MS
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- MD182564 OR
Self-reported in NPPES; status is on the state search - Practice location
- 17727 E Burnside St, Portland, OR 97233
- Phone
- (503) 215-9800
- Enumerated
- Mar 30, 2013
- Record last updated
- Oct 25, 2024
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 67 in Oregon → Look up another NPI →
Also registered at 17727 E Burnside St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah Baker, PTAPhysical Therapy Assistant1164871232
- Tabitha BassSocial Worker1326422429
- Susanne Bobenrieth, M.D.Family Medicine Physician1871577742
- Mary Cohen, RNCase Management Registered Nurse1821632480
- Lori Espedal, RNCommunity Health Registered Nurse1649520214
- Kristin FaulknerOccupational Therapy Assistant1316398324
Verify Chelsea R. Tieszen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD182564Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average geriatric medicine (internal medicine) physician in 2024
9,826 Medicare Part D claims for 265 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 563 claims were for opioids.
Most prescribed
- Atorvastatin Calcium500 claims
- Memantine Hcl373 claims
- Oxycodone Hcl303 claims
- Eliquis286 claims
- Levothyroxine Sodium281 claims
- Omeprazole255 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Chelsea R. Tieszen among 67 geriatric medicine (internal medicine) physician records in Oregon
Chelsea R. Tieszen, MD, MS is one of 67 geriatric medicine (internal medicine) physician records with a practice address in Oregon. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 84% of them.
- NPI issued2013 · 84% of these records are older, 15% newer
- In a Medicare fileYes · 61% of these records are
- In the CMS Doctors and Clinicians fileNo · 36% of these records are
- Record last updated2024 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Oregon
There are 67 geriatric medicine (internal medicine) physician records in Oregon.
All 67 in Oregon → Every provider in Portland → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Kellie Foster, M.D.Portland, OR 972331093916470
- Nathan Stumpf, MDPortland, OR 972321881337269
- Melinda JacksonPortland, OR 972301558330647
- Karen KrusePortland, OR 972361447310859
- Luis Rodriguez, MDPortland, OR 972301497757447
- Lisa Sanders, MDPortland, OR 972301093128571
- Laura Byerly, MDPortland, OR 972391568726024
- Kathleen Drago, MDPortland, OR 972391265721047
Common questions
What is Chelsea R. Tieszen, MD, MS's NPI number?
Chelsea R. Tieszen, MD, MS's National Provider Identifier (NPI) is 1518200377, issued on Mar 30, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Chelsea R. Tieszen, MD, MS located?
The NPPES record lists a practice address at 17727 E Burnside St, Portland, OR, 97233. Phone: (503) 215-9800. Providers update this record themselves, so call before visiting.
How can I verify Chelsea R. Tieszen, MD, MS's license?
NPPES lists Oregon license number MD182564, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Chelsea R. Tieszen, MD, MS prescribe under Medicare Part D?
In 2024, Chelsea R. Tieszen, MD, MS had 9,826 Medicare Part D claims for 265 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.