Dr. Benjamin Siemanowski, MD
- Medicare services, 2024
- 1,037
- Medicare patients, 2024
- 399
- Part D claims, 2024
- 1,125
- MIPS score, 2024
- 100
- Hospital affiliations
- 2
- Practice address
- 3111 Woburn St, Suite 101, Bellingham, WA 98226
- Practice phone
- Call (360) 734-1420
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Northwest Endoscopy - Bellingham
Surgery Center - Medicare-Certified · Bellingham, Washington
Find Dr. Siemanowski's professional email, personal email and mobile number
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Dr. Benjamin Siemanowski is a gastroenterologist in Bellingham, Washington
Dr. Siemanowski practices at Northwest Endoscopy - Bellingham in Bellingham, Washington.
Dr. Siemanowski's NPI, 1548301120, was assigned on February 8, 2007. Dr. Siemanowski graduated from Jefferson Medical College of Thomas Jefferson University in 2000. Dr. Siemanowski holds Washington license MD00047499.
- NPI
- 1548301120NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0244337285
- NPI enumeration date
- February 8, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (360) 734-1420
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Benjamin Siemanowski practices at Northwest Endoscopy - Bellingham in Bellingham, Washington
Dr. Siemanowski's primary practice is Northwest Endoscopy - Bellingham, at 3111 Woburn St, Suite 101, Bellingham, WA 98226. The practice phone is (360) 734-1420.
- Northwest Endoscopy - Bellingham3111 Woburn St, Suite 101, Bellingham, WA 98226Phone(360) 734-1420
Source: Dmand AI Affiliation Data
Dr. Benjamin Siemanowski is affiliated with 4 sites of care and 1 medical group
Dr. Siemanowski's primary practice is Northwest Endoscopy - Bellingham in Bellingham, Washington. Dr. Siemanowski is also affiliated with PeaceHealth St. Joseph Medical Center. The medical group on file is Northwest Gastroenterology & Endoscopy. Dmand AI also links Dr. Siemanowski to 1 more hospital and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Benjamin Siemanowski's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Siemanowski practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwest Endoscopy - Bellingham | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Benjamin Siemanowski is one of 434 gastroenterologists in Washington
Gastroenterology is Dr. Siemanowski's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Siemanowski is licensed in Washington.
Specialties and state licenses
- Gastroenterology, WashingtonPrimary
Gastroenterologists near Dr. Siemanowski
Counts of gastroenterologists 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. Benjamin Siemanowski billed Medicare for 1,037 services in 2024
CMS data shows 1,037 Medicare services from Dr. Siemanowski across 14 procedure codes in 2024, for 399 Medicare patients. Medicare paid $83,403 for them.
Dr. Siemanowski's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 4142024: 35913%
- Surgery
- 2023: 3332024: 28016%
- Office and hospital visits
- 2023: 1872024: 26039%
- Other services
- 2023: 822024: 11945%
- Tests and treatments
- 2023: 182024: 196%
Where Dr. Siemanowski's Medicare services took place, 2024
- In an office59958%
- In a facility43842%
Dr. Siemanowski compared with the Washington median for gastroenterologists, 2024
- Dr. Siemanowski
- Washington median
- Medicare services
- 1,037vs 3562.9 times
- Medicare patients
- 399vs 24464% above
- Part D claims
- 987vs 2723.6 times
Medians across 433 gastroenterologists in Washington with Dmand AI profiles that report each measure.
Dr. Siemanowski's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Siemanowski and other gastroenterologists in Washington.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Benjamin Siemanowski treated 399 Medicare patients in 2024, average age 73
CMS counts 399 Medicare patients who saw Dr. Siemanowski in 2024. The largest group is 65 to 74, with 211 patients. 65% of them have high cholesterol, and 58% have high blood pressure. 6% are also on Medicaid. Their average risk score is 0.86, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Siemanowski's median patient age at 63, with 54% women.
Dr. Siemanowski's Medicare patients by age, 2024
Dr. Siemanowski's Medicare patients by sex, 2024
- Women23358%
- Men16642%
Chronic conditions among Dr. Siemanowski's Medicare patients, 2024
- High cholesterol65%
- High blood pressure58%
- Arthritis43%
- Ischemic heart disease22%
- Mood disorders21%
- Anxiety18%
- Depression18%
- Cancer17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Siemanowski's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Benjamin Siemanowski wrote 1,125 Medicare Part D claims in 2024
In 2024, Dr. Siemanowski wrote 1,125 Medicare Part D claims for 550 patients. 78% of them were for generic drugs. CMS names the drug for 987 of them, across 18 drugs with 11 or more claims each, at $447,938 in total drug cost. In 2023, CMS named 894 claims across 16 drugs.
Dr. Siemanowski's Part D claims by kind of drug, 2024
- Generic874 claims78%
- Brand-name251 claims22%
Dr. Siemanowski'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.
Drug classes CMS tracks in Dr. Siemanowski's Part D claims, 2024
- Antibiotics1%13 of 1,125 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8942024: 98710%
Drugs named by CMS: 18 in 2024, 16 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
Dr. Benjamin Siemanowski scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Siemanowski for performance year 2024, reported as part of a group. Dr. Siemanowski accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Siemanowski as offering telehealth. CMS counts 116 procedures of colonoscopy by Dr. Siemanowski, more than 83% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Siemanowski's MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Siemanowski ranks in Medicare procedure volume
- Colonoscopy
- 83rd percentile116 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 74th percentile88 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Benjamin Siemanowski received $631 in industry payments from 2017 to 2021
CMS Open Payments shows 18 general payments to Dr. Siemanowski from 5 drug and device companies from 2017 to 2021. Food and beverage make up the largest share, 77% of the total. Janssen Pharmaceuticals, Inc paid the most, $326.
General payments to Dr. Siemanowski by program year, 2017 to 2021
General payments to Dr. Siemanowski by kind, 2017 to 2021
- Food and beverage$48577%
- Education speaker fees$11919%
- Device or supply loans$274%
Companies that paid Dr. Siemanowski the most, 2017 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Benjamin Siemanowski graduated from Jefferson Medical College of Thomas Jefferson University
Dr. Siemanowski graduated from Jefferson Medical College of Thomas Jefferson University in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Benjamin Siemanowski'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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)Clinician Public Reporting: Overall MIPS Performance (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) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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. Benjamin Siemanowski
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. Benjamin Siemanowski's NPI number?
Dr. Benjamin Siemanowski's NPI number is 1548301120. It was assigned on February 8, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Benjamin Siemanowski?
Dr. Benjamin Siemanowski is a gastroenterologist in Bellingham, Washington. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Benjamin Siemanowski practice?
Dr. Siemanowski practices at 3111 Woburn St, Suite 101, Bellingham, WA 98226. Dr. Siemanowski's primary practice is Northwest Endoscopy - Bellingham in Bellingham, Washington. Dmand AI also links Dr. Siemanowski to 1 hospital and 1 group practice or clinic.
What is Dr. Benjamin Siemanowski's office phone number?
The practice phone on file for Dr. Siemanowski is (360) 734-1420.
What is Dr. Benjamin Siemanowski's medical license number?
Dr. Siemanowski holds Washington license MD00047499.
Which hospitals is Dr. Benjamin Siemanowski affiliated with?
Dr. Siemanowski is affiliated with PeaceHealth St. Joseph Medical Center. Dmand AI links Dr. Siemanowski to 1 more hospital.
What medical group is Dr. Benjamin Siemanowski part of?
Dr. Siemanowski is linked to Northwest Gastroenterology & Endoscopy.
Does Dr. Benjamin Siemanowski accept Medicare?
Yes. CMS data shows Dr. Siemanowski billed Medicare for 1,037 services in 2024, and Dr. Siemanowski accepts Medicare assignment.
Does Dr. Benjamin Siemanowski offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Siemanowski as offering telehealth services.
What is Dr. Benjamin Siemanowski's MIPS score?
Dr. Siemanowski's MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Benjamin Siemanowski see?
CMS counts 399 Medicare patients who saw Dr. Siemanowski in 2024, with an average age of 73.
What services does Dr. Benjamin Siemanowski bill to Medicare?
In 2024, Dr. Siemanowski's most billed Medicare services were lab and pathology test (88305), surgery: digestive system (45385) and office visit, established patient (99214).
Where did Dr. Benjamin Siemanowski go to medical school?
Dr. Siemanowski graduated from Jefferson Medical College of Thomas Jefferson University in 2000.
What drugs does Dr. Benjamin Siemanowski prescribe most?
In 2024 Medicare Part D data, Dr. Siemanowski's most prescribed drugs by claims were Sod Sulf-Potass Sulf-Mag Sulf, Omeprazole and Pantoprazole Sodium.
Has Dr. Benjamin Siemanowski received payments from drug or device companies?
CMS Open Payments shows $631 in general payments to Dr. Siemanowski from 5 companies from 2017 to 2021. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Benjamin Siemanowski been practicing?
Dr. Siemanowski graduated from medical school in 2000, 26 years ago.
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