Dr. Mark T Chan , MD
Specialist • Clackamas, OR
10180 Se Sunnyside Rd, Dept Of Allergy
Clackamas, OR 970158970
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on September 14, 2006; this date does not establish years in practice.
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Published CMS data list 458 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Azelastine Hcl — 87 prescription fills, including refills.
- Montelukast Sodium — 79 prescription fills, including refills.
- Ipratropium Bromide — 63 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 10 records in the table · Guide: How to read Medicare Part D prescriber data
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Close to the middle for Part D prescriptions among clinicians listed under Specialist in Oregon (2024, 64 clinicians with data). Median for this group: 355. Middle half: 104 to 1,178.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 569 in 2020 to 458 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
10180 Se Sunnyside Rd
Dept Of Allergy
Clackamas, OR 970158970
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Kaiser Foundation Health Plan Of The Northwest. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
1992
What Public CMS Data Show
Specialist: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
876 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$66,286 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Years since graduation
34 years (graduated 1992)
CMS Doctors and Clinicians data list 1992 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Chan has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Chan as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Clackamas and Oregon
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Close to the middle for clinicians listed under Specialist in Oregon (2024, 64 clinicians with data). Median for this group: 355. Middle half: 104 to 1,178.
Too few clinicians listed under Specialist in Clackamas have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 65% of clinicians listed under Specialist in Oregon (2024, 64 clinicians with data). Median for this group: $22,641. Middle half: $1,246 to $124,627.
Too few clinicians listed under Specialist in Clackamas have Medicare Part D data for 2024 to compare.
22 active clinicians are listed under Specialist with a practice address in Clackamas, OR (1,085 in Oregon).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Clackamas
0% of these 22 clinicians have the CMS telehealth indicator.
9.1% of these 22 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 20% from 569 in 2020 to 458 in 2024.
- 2020: 569
- 2021: 615
- 2022: 526
- 2023: 460
- 2024: 458
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30-day fills
30-day fills decreased 20% from 1,090 in 2020 to 876 in 2024.
- 2020: 1,090
- 2021: 1,224
- 2022: 1,066
- 2023: 903
- 2024: 876
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Part D drug cost
Part D drug cost decreased 20% from $82,865 in 2020 to $66,286 in 2024.
- 2020: $82,865
- 2021: $406,337
- 2022: $77,233
- 2023: $71,010
- 2024: $66,286
Sources: CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Azelastine Hcl | Azelastine Hcl | 87 | 3,275 | $1,850.91 | 42 |
| Montelukast Sodium | Montelukast Sodium | 79 | 6,309 | $821.00 | 30 |
| Ipratropium Bromide | Ipratropium Bromide | 63 | 3,091 | $2,678.25 | 35 |
| Breyna | Budesonide/Formoterol Fumarate | 46 | 1,789 | $7,672.06 | 15 |
| Spiriva Respimat | Tiotropium Bromide | 43 | 3,330 | $32,379.32 | 21 |
| Alvesco | Ciclesonide | 42 | 3,286 | $8,193.11 | 26 |
| Wixela Inhub | Fluticasone Propion/Salmeterol | 35 | 2,910 | $9,848.72 | 18 |
| Prednisone | Prednisone | 32 | 359 | $235.55 | 24 |
| Epinephrine | Epinephrine | 20 | 600 | $2,428.48 | 15 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 11 | 308 | $178.53 | — |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 174400000X
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - ALLERGY/IMMUNOLOGY
I20230905000187
WA
2860401304
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Kaiser Foundation Health Plan Of The Northwest
2400 Lancaster Dr Ne, Salem, OR 973051221
Phone: 8008132000
Kaiser Foundation Health Plan Of The Northwest
10180 Se Sunnyside Rd, Clackamas, OR 970158970
Phone: 8008132000
Kaiser Foundation Health Plan Of The Northwest
10100 Se Sunnyside Rd, Clackamas, OR 970158970
Phone: 8008132000
Kaiser Foundation Health Plan Of The Northwest
3620 N Interstate Ave, Portland, OR 972271106
Phone: 8008132000
Kaiser Foundation Health Plan Of The Northwest
3600 N Interstate Ave, Portland, OR 972271106
Phone: 8008132000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Radiology - Diagnostic Radiology
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Pathology - Anatomic Pathology & Clinical Pathology
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant (Certified)
Internal Medicine
Doctor of Osteopathic Medicine (D.O.)
Podiatrist - Foot & Ankle Surgery
Doctor of Podiatric Medicine
Career & Practice History
NPI enumerated September 14, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Mailing Address
10180 Se Sunnyside Rd, Dept Of Allergy
Clackamas, OR 970158970