Dr. Michael Wayne Armstrong , DO
Internal Medicine β’ Clackamas, OR
10100 Se Sunnyside Rd
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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Dr. Michael Armstrong is listed in NPPES under Internal Medicine.
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NPI assigned on April 2, 2019; this date does not establish years in practice.
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Published CMS data list 117 Medicare Part D prescriptions, including refills, in 2022.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2022. Published rows only; this is not a quality measure.
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Published Part D records, 2022:
- Atorvastatin Calcium β 24 prescription fills, including refills.
- Gabapentin β 20 prescription fills, including refills.
- Amlodipine Besylate β 17 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2022. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 7 records in the table Β· Guide: How to read Medicare Part D prescriber data
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Medicare Part D prescriptions went from 104 in 2020 to 117 in 2022.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2020β2022.
Practice Location & Contact Primary Location
10100 Se Sunnyside Rd
Clackamas, OR 970158970
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
212 standardized 30-day fills in 2022
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
$7,862 in 2022
The total cost of these prescriptions in 2022, 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 β by Provider and Drug, 2022.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $26.38 in 2024
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2024.
NPI first issued
2019
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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, βDoes your provider accept Medicare as full payment?β
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.
Can order Medicare-covered services
CMS lists Dr. Armstrong 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
Comparisons use 2024 data. The latest CMS data for Dr. Armstrong are from 2022.
101 active clinicians are listed under Internal Medicine with a practice address in Clackamas, OR (2,118 in Oregon).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Clackamas
9.9% of these 101 clinicians have the CMS telehealth indicator.
73.3% of these 101 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 increased 13% from 104 in 2020 to 117 in 2022.
- 2020: 104
- 2021: 321
- 2022: 117
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30-day fills
30-day fills increased 39% from 153 in 2020 to 212 in 2022.
- 2020: 153
- 2021: 567
- 2022: 212
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Part D drug cost
Part D drug cost decreased 55% from $17,319 in 2020 to $7,862 in 2022.
- 2020: $17,319
- 2021: $23,910
- 2022: $7,862
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2024 only.
Sources: CMS Medicare Part D Prescribers (2022), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2024 (payments made January 1 β December 31, 2024): fewer than 11 records totaling $26.38.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Haemonetics Corporation |
Food and Beverage
In-kind items and services
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TEG6S HEMOSTASIS SYSTEM | General | $26.38 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2022.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 24 | 1,410 | $368.21 | β |
| Gabapentin | Gabapentin | 20 | 840 | $1,307.50 | β |
| Amlodipine Besylate | Amlodipine Besylate | 17 | 1,350 | $107.23 | β |
| Fluticasone Propionate | Fluticasone Propionate | 16 | 750 | $161.98 | β |
| Lisinopril | Lisinopril | 15 | 1,110 | $64.95 | β |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 14 | 450 | $691.70 | β |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 11 | 360 | $5,160.04 | β |
Source: CMS Part D by Provider and Drug, 2022; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2026-06-29NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
NUCC Taxonomy Code: 207RP1001X
An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.
NUCC Taxonomy Code: 207RC0200X
An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSSources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Radiology - Vascular & Interventional Radiology
Doctor of Osteopathic Medicine (D.O.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 10100 SE SUNNYSIDE RD, CLACKAMAS, OR 970158970 (Tel: 5036522880)
Registered at 10100 SE SUNNYSIDE RD, CLACKAMAS, OR 970158970 (Tel: 5036522880)
Registered at 3181 SW SAM JACKSON PARK RD, PORTLAND, OR 972393011 (Tel: 5034948211)
Registered at 3181 SW SAM JACKSON PARK RD, PORTLAND, OR 972393098 (Tel: 5034948211)
Registered at 3181 SW SAM JACKSON PARK RD # BTE119, PORTLAND, OR 972393011 (Tel: 5034941164)
Registered at 3181 SW SAM JACKSON PARK RD # BTE119, PORTLAND, OR 972393098 (Tel: 5034941164)
Internal Medicine (license number reported to NPPES: OR DO209686)
NPI status registered as active in NPPES database
Registered at MEDICAL CENTER BLVD, WINSTON SALEM, NC 271570001 (Tel: 3367162011)
Registered at MEDICAL CENTER BLVD, WINSTON SALEM, NC 271570001 (Tel: 3367162011)
Recorded as MICHAEL ARMSTRONG, DO
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Clackamas
- Dr. Mark Wozniak, MD
- Dr. Christine Choo, MD
- Dr. Daniel Sonshine, MD
- Dr. Tom Shi, MD
- Dr. Andrea Veryser, MD
- Ronda Keller
Mailing Address
10100 Se Sunnyside Rd
Clackamas, OR 970158970
Phone: 5036522880