Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Gregory Mark Mathien, MD

Individual provider Sports Medicine (Orthopaedic Surgery) Physician · NPI 1730156076

Dr. Gregory Mark Mathien, MD practises Sports Medicine in Knoxville, Tennessee. Graduated from State University of Ny Upstate Medical University in 1986, 40 years ago. Practices with Orthotennessee PC, a 154-clinician group and accepts Medicare assignment. Licensed in Tennessee.

Years since qualifying
40
Trained at
State University of Ny Upstate Medical University
Licensed in
TN
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1422 Old Weisgarber Rd
Knoxville, TN 37909-1293
Phone: (865) 558-4400
Fax: (865) 558-4471
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Sports Medicine (Orthopaedic Surgery) Physician (primary) Taxonomy 207XX0005X · Licence 21414 (TN)
Orthopaedic Surgery Physician Taxonomy 207X00000X · Licence MD21414 (TN)

Record details

NPI number1730156076
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 7, 2006
Last updated in NPPESJanuary 15, 2026
Certification dateJanuary 15, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtySPORTS MEDICINE
Also practisesORTHOPEDIC SURGERY
Medical schoolSTATE UNIVERSITY OF NY UPSTATE MEDICAL UNIVERSITY
Graduated 1986 (40 years in practice)
Group practice Orthotennessee Pc — 154 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Knee replacement 30 times · 64th percentile
Lower limb (leg) arthroscopy (minimally invasive joint repair) 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients235
Services billed 1,317 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Orthotennessee PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 154 clinicians in the practice; 12 are shown here.

Other providers in Knoxville