Dr. Dennis Chan Tan, MD
- Part D claims, 2024
- 73
- Hospital affiliations
- 1
- Industry payments
- $21
- Medical groups
- 5
- State license
- 1
- Practice address
- 10330 Se 32nd Ave, Portland, OR 97222
- Practice phone
- Call (503) 513-1800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Providence Medical Group
Portland, Oregon
Find Dr. Tan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Dennis Chan Tan is an OB-GYN in Portland, Oregon
Dr. Tan practices at Providence Medical Group in Portland, Oregon.
Dr. Tan's NPI, 1457577983, was assigned on April 17, 2007. Dr. Tan holds Oregon license MD27355.
- NPI
- 1457577983NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2860591732
- NPI enumeration date
- April 17, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (503) 513-1800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Dennis Chan Tan practices at Providence Medical Group in Portland, Oregon
Dr. Tan's primary practice is Providence Medical Group, at 10330 Se 32nd Ave, Portland, OR 97222 in Clackamas County. The practice phone is (503) 513-1800.
- Providence Medical Group10330 Se 32nd Ave, Portland, OR 97222 · Clackamas CountyPhone(503) 513-1800
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Dennis Chan Tan is affiliated with 4 sites of care and 5 medical groups
Dr. Tan's primary practice is Providence Medical Group in Portland, Oregon. Dr. Tan is also affiliated with Providence Milwaukie Hospital. The medical group on file is Providence Medical Group, Oregon. Dmand AI also links Dr. Tan to 4 more medical groups and 2 group practices and clinics, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Dennis Chan Tan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Providence Medical Group | Available with a free account |
| +3 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Dennis Chan Tan is one of 534 OB-GYNs in Oregon
Obstetrics and gynecology is Dr. Tan's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Tan is licensed in Oregon.
Specialties and state licenses
- Obstetrics and gynecology, OregonPrimary
OB-GYNs near Dr. Tan
Counts of OB-GYNs with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Dennis Chan Tan's patients have a median age of 38
Across all payers, Dmand AI patient panel data puts Dr. Tan's median patient age at 38, with 97% women.
Dr. Tan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women97%
- Men1%
Source: Dmand AI Patient Panel Data
Dr. Dennis Chan Tan wrote 73 Medicare Part D claims in 2024
In 2024, Dr. Tan wrote 73 Medicare Part D claims for 34 patients. 97% of them were for generic drugs. CMS names the drug for 24 of them, across 1 drug with 11 or more claims each, at $1,140 in total drug cost. In 2023, CMS named 30 claims across 1 drug.
Dr. Tan's Part D claims by kind of drug, 2024
- Generic71 claims97%
- Brand-name and other2 claims3%
Dr. Tan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 302024: 2420%
Drugs named by CMS: 1 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Dennis Chan Tan takes part in Medicare
Dr. Tan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of the uterus: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Dennis Chan Tan received $21 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Tan from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Duchesnay USA Incorporated paid the most, $21.
Companies that paid Dr. Tan the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Dennis Chan Tan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Dennis Chan Tan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Dennis Chan Tan's NPI number?
Dr. Dennis Chan Tan's NPI number is 1457577983. It was assigned on April 17, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Dennis Chan Tan?
Dr. Dennis Chan Tan is an OB-GYN in Portland, Oregon. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Dennis Chan Tan practice?
Dr. Tan practices at 10330 Se 32nd Ave, Portland, OR 97222. Dr. Tan's primary practice is Providence Medical Group in Portland, Oregon. Dmand AI also links Dr. Tan to 4 medical groups and 2 group practices and clinics.
What is Dr. Dennis Chan Tan's office phone number?
The practice phone on file for Dr. Tan is (503) 513-1800.
What is Dr. Dennis Chan Tan's medical license number?
Dr. Tan holds Oregon license MD27355.
Which hospitals is Dr. Dennis Chan Tan affiliated with?
Dr. Tan is affiliated with Providence Milwaukie Hospital.
What medical group is Dr. Dennis Chan Tan part of?
Dr. Tan is linked to Providence Medical Group, Oregon. Dmand AI links Dr. Tan to 4 more medical groups.
Does Dr. Dennis Chan Tan accept Medicare?
Yes. CMS lists Dr. Tan as accepting Medicare assignment.
What drugs does Dr. Dennis Chan Tan prescribe most?
In 2024 Medicare Part D data, Dr. Tan's most prescribed drugs by claims were Estradiol.
Has Dr. Dennis Chan Tan received payments from drug or device companies?
CMS Open Payments shows $21 in general payments to Dr. Tan from 1 company from 2016 to 2016. The largest total came from Duchesnay USA Incorporated.
How long has Dr. Dennis Chan Tan been practicing?
Dr. Tan graduated from medical school in 2003, 23 years ago.
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