Mark A. Klaassen, MD
Orthopaedic Surgery Physician · Warsaw, IN
Mark A. Klaassen, MD is an orthopaedic surgery physician with a practice address in Warsaw, Indiana, and NPI 1053325589, issued on Jul 28, 2006. Check the license (Indiana 01031923A, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Mark A. Klaassen
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- 01031923A IN
Self-reported in NPPES; status is on the state search - Practice location
- 315 East 200 North, Warsaw, IN 46582
- Phone
- (574) 264-4163
- Enumerated
- Jul 28, 2006
- Record last updated
- Dec 23, 2025
- Fax
- (574) 262-9650
- Medicaid ID
- 100206940A IN
- Medicare enrollment
- Enrolled (PECOS I20101124000150); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 1982
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 491 in Indiana → Look up another NPI →
Verify Mark A. Klaassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 01031923ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
50 Medicare Part D claims for 42 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Amoxicillin30 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 78.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $54,133.32
42 payments; by number, the most common kind was food and beverage; the largest payer was Medacta USA, Inc. The 15,003 providers of this specialty with any payment received $23,022.89 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Orthopaedics Northeast PCFort Wayne, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark A. Klaassen among 491 orthopaedic surgery physician records in Indiana
Mark A. Klaassen, MD is one of 491 orthopaedic surgery physician records with a practice address in Indiana. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 20% of them.
- NPI issued2006 · 20% of these records are older, 45% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1982 · median 2004 among the 314 with a school on file
- Record last updated2025 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in Indiana
There are 491 orthopaedic surgery physician records in Indiana.
All 491 in Indiana → Every provider in Warsaw → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Leo Jansen, M.D.Warsaw, IN 465821518943042
- Kyle Carlson, D.O.Warsaw, IN 465801255718367
- Leamon Williams, MDWarsaw, IN 465801073514451
- Gregg Ebersole, M.D.South Bend, IN 466011093000366
- Eric McCoy, M.D.South Bend, IN 466011942572797
- Pratik PatelSouth Bend, IN 466011447641303
- Joel Post, D.O.South Bend, IN 466011407014442
- Leeanne Torres, MDSouth Bend, IN 466011427444165
Common questions
What is Mark A. Klaassen, MD's NPI number?
Mark A. Klaassen, MD's National Provider Identifier (NPI) is 1053325589, issued on Jul 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark A. Klaassen, MD located?
The NPPES record lists a practice address at 315 East 200 North, Warsaw, IN, 46582. Phone: (574) 264-4163. Providers update this record themselves, so call before visiting.
How can I verify Mark A. Klaassen, MD's license?
NPPES lists Indiana license number 01031923A, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark A. Klaassen, MD prescribe under Medicare Part D?
In 2024, Mark A. Klaassen, MD had 50 Medicare Part D claims for 42 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. Part D covers Medicare prescriptions only.
What is Mark A. Klaassen, MD's MIPS final score?
The 2023 MIPS final score is 78.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.