Dennis Chan Tan, M.D.
Obstetrics & Gynecology Physician · Milwaukie, OR
Dennis Chan Tan, M.D. is an obstetrics & gynecology physician with a practice address in Milwaukie, Oregon, and NPI 1457577983, issued on Apr 17, 2007. Check the license (Oregon MD27355, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Dennis Chan Tan
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- MD27355 OR
Self-reported in NPPES; status is on the state search - Practice location
- 10330 SE 32ND Ave Ste 305, Milwaukie, OR 97222
- Phone
- (503) 513-1800
- Enumerated
- Apr 17, 2007
- Record last updated
- Mar 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 274140 OR
- Medicare enrollment
- Enrolled (PECOS I20070619000425); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 654 in Oregon → Look up another NPI →
Also registered at 10330 SE 32ND Ave Ste 305
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anita Chan, MDObstetrics & Gynecology Physician1912921156
- Suzanne Funkhouser, MDObstetrics & Gynecology Physician1124451521
- Diana Gill, M.D.Obstetrics & Gynecology Physician1386893444
- Mandeep Kingra, MDObstetrics & Gynecology Physician1750693602
- Janell Niemann-Ross, CNM, RNAdvanced Practice Midwife1255525655
Verify Dennis Chan Tan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD27355Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
73 Medicare Part D claims for 34 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol24 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 87.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Providence Health And Services OregonMilwaukie, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Dennis Chan Tan among 654 obstetrics & gynecology physician records in Oregon
Dennis Chan Tan, M.D. is one of 654 obstetrics & gynecology physician records with a practice address in Oregon. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 52% of them.
- NPI issued2007 · 52% of these records are older, 40% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2003 · median 2007 among the 413 with a school on file
- Record last updated2021 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Oregon
There are 654 obstetrics & gynecology physician records in Oregon.
All 654 in Oregon → Every provider in Milwaukie → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Samantha Adkins, MDMilwaukie, OR 972221790905164
- Anita Chan, MDMilwaukie, OR 972221912921156
- Suzanne Funkhouser, MDMilwaukie, OR 972221124451521
- Diana Gill, M.D.Milwaukie, OR 972221386893444
- Mandeep Kingra, MDMilwaukie, OR 972221750693602
- Nancy Lin, MDMilwaukie, OR 972221255302691
- Robert Dyson, MDPortland, OR 972201922021336
- Maxine Bauer, M.D.Portland, OR 972251497749345
Common questions
What is Dennis Chan Tan, M.D.'s NPI number?
Dennis Chan Tan, M.D.'s National Provider Identifier (NPI) is 1457577983, issued on Apr 17, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Dennis Chan Tan, M.D. located?
The NPPES record lists a practice address at 10330 SE 32ND Ave Ste 305, Milwaukie, OR, 97222. Phone: (503) 513-1800. Providers update this record themselves, so call before visiting.
How can I verify Dennis Chan Tan, M.D.'s license?
NPPES lists Oregon license number MD27355, 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 Dennis Chan Tan, M.D. prescribe under Medicare Part D?
In 2024, Dennis Chan Tan, M.D. had 73 Medicare Part D claims for 34 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
What is Dennis Chan Tan, M.D.'s MIPS final score?
The 2023 MIPS final score is 87.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.