Dr. Mark A. Klaassen, MD
- Medicare services, 2023
- 573
- Part D claims, 2024
- 50
- Publications
- 5
- Clinical trials
- 1
- MIPS score, 2024
- 82
- Practice address
- 200 High Park Ave, Goshen, IN 46526
- Practice phone
- Call (574) 364-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Klaassen'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. Mark A. Klaassen is an orthopedic surgeon in Goshen, Indiana
Dr. Klaassen practices at Goshen Hospital in Goshen, Indiana, part of Parkview Health System.
Dr. Klaassen's NPI, 1053325589, was assigned on July 28, 2006. Dr. Klaassen graduated from Indiana University School of Medicine in 1982. Dr. Klaassen holds Indiana license 01031923A.
- NPI
- 1053325589NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6103930805
- NPI enumeration date
- July 28, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (574) 364-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 70
- Medical school graduation
- 1982
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark A. Klaassen practices at Goshen Hospital in Goshen, Indiana
Dr. Klaassen's primary practice is Goshen Hospital, at 200 High Park Ave, Goshen, IN 46526 in Elkhart County. The practice phone is (574) 364-1000.
- Goshen Hospital200 High Park Ave, Goshen, IN 46526 · Elkhart CountyPhone(574) 364-1000
Source: Dmand AI Affiliation Data
Dr. Mark A. Klaassen is affiliated with 4 sites of care and 2 medical groups
Dr. Klaassen's primary practice is Goshen Hospital in Goshen, Indiana, part of Parkview Health System. Dr. Klaassen is also affiliated with Parkview Whitley Hospital. The medical group on file is OSMC - The Orthopedic & Sports Medicine Center. Dmand AI also links Dr. Klaassen to 1 more hospital, 1 group practice or clinic and 1 medical group, 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. Mark A. Klaassen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Klaassen practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Goshen Hospital | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Parkview Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark A. Klaassen is one of 429 orthopedic surgeons in Indiana
Orthopaedic surgery is Dr. Klaassen's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Klaassen is licensed in Indiana.
Specialties and state licenses
- Orthopaedic surgery, IndianaPrimary
Orthopedic surgeons near Dr. Klaassen
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. Mark A. Klaassen billed Medicare for 573 services in 2023
CMS data shows 573 Medicare services from Dr. Klaassen across 14 procedure codes in 2023. Medicare paid $199,686 for them.
Dr. Klaassen's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Surgery
- 2022: 3022023: 23821%
- Drugs given in the office
- 2022: 1162023: 17450%
- Office and hospital visits
- 2022: 1482023: 10628%
- Imaging
- 2022: 1072023: 5549%
Where Dr. Klaassen's Medicare services took place, 2023
- In an office35562%
- In a facility21838%
Dr. Klaassen compared with the Indiana median for orthopedic surgeons, 2023
- Dr. Klaassen
- Indiana median
- Medicare services
- 573vs 1,34257% below
- Part D claims
- 30vs 16682% below
Medians across 423 orthopedic surgeons in Indiana with Dmand AI profiles that report each measure.
Dr. Klaassen's most billed Medicare procedure codes, 2023
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. Klaassen and other orthopedic surgeons in Indiana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark A. Klaassen's patients have a median age of 73
Across all payers, Dmand AI patient panel data puts Dr. Klaassen's median patient age at 73, with 59% women.
Dr. Klaassen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women59%
- Men39%
Source: Dmand AI Patient Panel Data
Dr. Mark A. Klaassen wrote 50 Medicare Part D claims in 2024
In 2024, Dr. Klaassen wrote 50 Medicare Part D claims for 42 patients. 100% of them were for generic drugs. CMS names the drug for 30 of them, across 1 drug with 11 or more claims each, at $70 in total drug cost. In 2023, CMS named 264 claims across 4 drugs.
Dr. Klaassen'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. Klaassen's Part D claims, 2024
- Antibiotics78%39 of 50 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: 2642024: 3089%
Drugs named by CMS: 1 in 2024, 4 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. Mark A. Klaassen scored 82 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 82 out of 100 for Dr. Klaassen for performance year 2024, reported as part of a group. Dr. Klaassen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Klaassen's MIPS scores, performance year 2024
- 82of 100Final score
- 59.7of 100Quality
- 90of 100Promoting Interoperability
- 40of 100Improvement Activities
- 88of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Hip replacement: 1 to 10 procedures (CMS shows small counts as a range)
Knee replacement: 1 to 10 procedures (CMS shows small counts as a range)
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. Mark A. Klaassen has 5 publications on record
Dmand AI links 5 papers to Dr. Klaassen, published from 2014 to 2017. 2017 was the busiest year, with 2. Dr. Klaassen's most frequent co-authors are Edith M. Cullen, MD, Ryan P. Foreman, MD and Christian Lattermann, MD.
Dr. Klaassen's most frequent co-authors
- Edith M. Cullen, MD1 shared paper
- Ryan P. Foreman, MD1 shared paper
- Christian Lattermann, MD1 shared paper
Recent publications by Dr. Klaassen
J Invest Surg
See who Dr. Klaassen researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Klaassen works with, so you can find a warm path to the right orthopedic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark A. Klaassen has worked on 1 clinical trial
Dmand AI links Dr. Klaassen to 1 clinical trial. Conditions studied include Osteoarthritis, Knee and Osteoarthritis. Open Payments lists research payments to Dr. Klaassen that name 1 trial.
Conditions in Dr. Klaassen's trials
- Osteoarthritis, Knee
- Osteoarthritis
Investigators on the most trials with Dr. Klaassen
Recent clinical trials with Dr. Klaassen
Sources: Open Payments (CMS), 2025 data, released July 7, 2026; Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Mark A. Klaassen received $1,735,692 in industry payments from 2016 to 2025
CMS Open Payments shows 1,268 general payments to Dr. Klaassen from 26 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 42% of the total. Smith & Nephew, Inc. paid the most, $616,747. It also lists 8 research payments totaling $71,672 from 2017 to 2021, naming 1 clinical trial.
General payments to Dr. Klaassen by program year, 2016 to 2025
General payments to Dr. Klaassen by kind, 2016 to 2025
- Consulting fees$728,54942%
- Acquisitions$564,10233%
- Royalties and licenses$280,63616%
- Travel and lodging$93,7795%
- Other$60,9924%
Companies that paid Dr. Klaassen the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark A. Klaassen graduated from Indiana University School of Medicine
Dr. Klaassen graduated from Indiana University School of Medicine in 1982.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark A. Klaassen'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 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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (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. Mark A. Klaassen
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. Mark A. Klaassen's NPI number?
Dr. Mark A. Klaassen's NPI number is 1053325589. It was assigned on July 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark A. Klaassen?
Dr. Mark A. Klaassen is an orthopedic surgeon in Goshen, Indiana. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Mark A. Klaassen practice?
Dr. Klaassen practices at 200 High Park Ave, Goshen, IN 46526. Dr. Klaassen's primary practice is Goshen Hospital in Goshen, Indiana, part of Parkview Health System. Dmand AI also links Dr. Klaassen to 1 hospital, 1 group practice or clinic and 1 medical group.
What is Dr. Mark A. Klaassen's office phone number?
The practice phone on file for Dr. Klaassen is (574) 364-1000.
What is Dr. Mark A. Klaassen's medical license number?
Dr. Klaassen holds Indiana license 01031923A.
Which hospitals is Dr. Mark A. Klaassen affiliated with?
Dr. Klaassen practices at Goshen Hospital in Goshen, Indiana. Dr. Klaassen is also affiliated with Parkview Whitley Hospital. Dmand AI links Dr. Klaassen to 1 more hospital.
What medical group is Dr. Mark A. Klaassen part of?
Dr. Klaassen is linked to OSMC - The Orthopedic & Sports Medicine Center. Dmand AI links Dr. Klaassen to 1 more medical group.
Does Dr. Mark A. Klaassen accept Medicare?
Yes. CMS data shows Dr. Klaassen billed Medicare for 573 services in 2023, and Dr. Klaassen accepts Medicare assignment.
What is Dr. Mark A. Klaassen's MIPS score?
Dr. Klaassen's MIPS final score for performance year 2024 is 82 out of 100, reported as part of a group.
What services does Dr. Mark A. Klaassen bill to Medicare?
In 2023, Dr. Klaassen's most billed Medicare services were injected or infused drug (J1100), surgery: bones and joints (27447) and surgery: bones and joints (27130).
Show 6 more questionsShow fewer questions
Where did Dr. Mark A. Klaassen go to medical school?
Dr. Klaassen graduated from Indiana University School of Medicine in 1982.
What drugs does Dr. Mark A. Klaassen prescribe most?
In 2024 Medicare Part D data, Dr. Klaassen's most prescribed drugs by claims were Amoxicillin.
Has Dr. Mark A. Klaassen received payments from drug or device companies?
CMS Open Payments shows $1,735,692 in general payments to Dr. Klaassen from 26 companies from 2016 to 2025. The largest total came from Smith & Nephew, Inc.
How long has Dr. Mark A. Klaassen been practicing?
Dr. Klaassen graduated from medical school in 1982, 44 years ago.
Does Dr. Mark A. Klaassen do research?
Dmand AI links 5 publications to Dr. Klaassen, published from 2014 to 2017. Dr. Klaassen has worked on 1 clinical trial.
Who does Dr. Mark A. Klaassen publish with?
Dr. Klaassen's most frequent co-authors are Edith M. Cullen, MD (1 shared paper), Ryan P. Foreman, MD (1 shared paper) and Christian Lattermann, MD (1 shared paper).
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