Dr. Dennis R. Assenmacher, MD
- Medicare services, 2024
- 11
- Medicare patients, 2024
- 17
- Part D claims, 2021
- 15
- Industry payments
- $1,245
- Affiliated sites
- 1
- Practice address
- 5200 Harroun Rd, Sylvania, OH 43560
- Practice phone
- Call (419) 824-1444
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Promedica Flower Hospital
Sylvania, Ohio
Find Dr. Assenmacher's professional email, personal email and mobile number
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Dr. Dennis R. Assenmacher is an orthopedic surgeon in Sylvania, Ohio
Dr. Assenmacher practices at Promedica Flower Hospital in Sylvania, Ohio.
Dr. Assenmacher's NPI, 1154323384, was assigned on June 1, 2005. Dr. Assenmacher graduated from University of Michigan Medical School in 1969. Dr. Assenmacher holds Ohio license 35039245.
- NPI
- 1154323384NPI Registry (opens in a new tab)
- NPI enumeration date
- June 1, 2005
- NPI status
- Active
- Practice phone
- (419) 824-1444
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 83
- Medical school graduation
- 1969
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Dennis R. Assenmacher practices at Promedica Flower Hospital in Sylvania, Ohio
Dr. Assenmacher's primary practice is Promedica Flower Hospital, at 5200 Harroun Rd, Sylvania, OH 43560 in Lucas County. The practice phone is (419) 824-1444.
- Promedica Flower Hospital5200 Harroun Rd, Sylvania, OH 43560 · Lucas CountyPhone(419) 824-1444
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Dennis R. Assenmacher is affiliated with 2 sites of care and 1 medical group
Dr. Assenmacher's primary practice is Promedica Flower Hospital in Sylvania, Ohio. The medical group on file is ProMedica Physicians. Dmand AI also links Dr. Assenmacher to 1 more group practice or clinic, 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 R. Assenmacher's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Assenmacher practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Promedica Flower Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Dennis R. Assenmacher is one of 828 orthopedic surgeons in Ohio
Orthopaedic surgery is Dr. Assenmacher's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Assenmacher is board certified in orthopaedic surgery by the American Board of Orthopaedic Surgery. Dr. Assenmacher is licensed in Ohio.
Specialties and state licenses
- Orthopaedic surgery, OhioPrimary
Orthopedic surgeons near Dr. Assenmacher
Counts of orthopedic surgeons 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 R. Assenmacher billed Medicare for 11 services in 2024
CMS data shows 11 Medicare services from Dr. Assenmacher across 1 procedure code in 2024, all of them office visits, for 17 Medicare patients. Medicare paid $659 for them. Every service was in an office.
Dr. Assenmacher's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 172024: 1135%
Dr. Assenmacher compared with the Ohio median for orthopedic surgeons, 2024
- Dr. Assenmacher
- Ohio median
- Medicare services
- 11vs 80499% below
- Medicare patients
- 17vs 23693% below
- Part D claims
- 15vs 12388% below
Medians across 822 orthopedic surgeons in Ohio with Dmand AI profiles that report each measure.
Dr. Assenmacher'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. Assenmacher and other orthopedic surgeons in Ohio.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Dennis R. Assenmacher treated 17 Medicare patients in 2024, average age 76
CMS counts 17 Medicare patients who saw Dr. Assenmacher in 2024. The largest group is under 65, with 0 patients. Their average risk score is 1.10, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Assenmacher's median patient age at 65, with 41% women.
Dr. Assenmacher's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Assenmacher's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women41%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Dennis R. Assenmacher wrote 15 Medicare Part D claims in 2021
In 2021, Dr. Assenmacher wrote 15 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $29 in total drug cost. In 2019, CMS named 29 claims across 2 drugs.
Dr. Assenmacher's most prescribed drugs by claims, 2021
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, 2019 to 2021
- 2019
- 2021
- Claims for drugs CMS names
- 2019: 292021: 1548%
Drugs named by CMS: 1 in 2021, 2 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Dennis R. Assenmacher received $1,245 in industry payments from 2016 to 2020
CMS Open Payments shows 24 general payments to Dr. Assenmacher from 10 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 100% of the total. Smith & Nephew, Inc. paid the most, $852.
General payments to Dr. Assenmacher by program year, 2016 to 2020
Companies that paid Dr. Assenmacher the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Dennis R. Assenmacher graduated from University of Michigan Medical School
Dr. Assenmacher graduated from University of Michigan Medical School in 1969.
- Medical school
- Board certified in orthopaedic surgery
Source: Dmand AI Professional Profile Data
Sources for Dr. Dennis R. Assenmacher'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 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) |
| 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. Dennis R. Assenmacher
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 R. Assenmacher's NPI number?
Dr. Dennis R. Assenmacher's NPI number is 1154323384. It was assigned on June 1, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Dennis R. Assenmacher?
Dr. Dennis R. Assenmacher is an orthopedic surgeon in Sylvania, Ohio. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Dennis R. Assenmacher practice?
Dr. Assenmacher practices at 5200 Harroun Rd, Sylvania, OH 43560. Dr. Assenmacher's primary practice is Promedica Flower Hospital in Sylvania, Ohio. Dmand AI also links Dr. Assenmacher to 1 group practice or clinic.
What is Dr. Dennis R. Assenmacher's office phone number?
The practice phone on file for Dr. Assenmacher is (419) 824-1444.
What is Dr. Dennis R. Assenmacher's medical license number?
Dr. Assenmacher holds Ohio license 35039245.
What medical group is Dr. Dennis R. Assenmacher part of?
Dr. Assenmacher is linked to ProMedica Physicians.
Does Dr. Dennis R. Assenmacher accept Medicare?
Yes. CMS data shows Dr. Assenmacher billed Medicare for 11 services in 2024.
How many Medicare patients does Dr. Dennis R. Assenmacher see?
CMS counts 17 Medicare patients who saw Dr. Assenmacher in 2024, with an average age of 76.
Is Dr. Dennis R. Assenmacher board certified?
Yes. Dr. Assenmacher is board certified in orthopaedic surgery by the American Board of Orthopaedic Surgery.
What services does Dr. Dennis R. Assenmacher bill to Medicare?
In 2024, Dr. Assenmacher's most billed Medicare services were office visit, new patient (99203).
Show 4 more questionsShow fewer questions
Where did Dr. Dennis R. Assenmacher go to medical school?
Dr. Assenmacher graduated from University of Michigan Medical School in 1969.
What drugs does Dr. Dennis R. Assenmacher prescribe most?
In 2021 Medicare Part D data, Dr. Assenmacher's most prescribed drugs by claims were Tramadol HCl.
Has Dr. Dennis R. Assenmacher received payments from drug or device companies?
CMS Open Payments shows $1,245 in general payments to Dr. Assenmacher from 10 companies from 2016 to 2020. The largest total came from Smith & Nephew, Inc.
How long has Dr. Dennis R. Assenmacher been practicing?
Dr. Assenmacher graduated from medical school in 1969, 57 years ago.
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