Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Dr. Dennis Patrick Grusenmeyer, MD

Individual provider Internal Medicine Physician · NPI 1871568113

Dr. Dennis Patrick Grusenmeyer, MD practises Internal Medicine in Keene, New Hampshire. Graduated from University of Cincinnati College of Medicine in 1997, 29 years ago. Practices with Legacy Clinics LLC, a 718-clinician group, works from 7 locations and accepts Medicare assignment. Licensed in North Carolina, New Hampshire, Oregon and Virginia and 1 more.

Years since qualifying
29
Trained at
University of Cincinnati College of Medicine
Licensed in
NC, NH, OR, VA, WA
In the registry since
2006
Specialties on file
7
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

580 Court St
Keene, NH 03431
Phone: (603) 354-5400
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (6)

  • 509 Biltmore Ave, Asheville, NC 28801-4601 — (828) 213-4411
  • 590 Court St, Keene, NH 03431-1719 — (603) 354-5400
  • 3043 Ne 28th St, Lincoln City, OR 97367-4518 — (541) 994-3661
  • 2801 N Gantenbein Ave, Portland, OR 97227-1623 — (503) 413-8407
  • 3241 Western Branch Blvd, Chesapeake, VA 23321-5260 — (757) 686-3508
  • 888 Swift Blvd, Richland, WA 99352-3514 — (509) 942-2648

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 20152 (NH)
Internal Medicine Physician Taxonomy 207R00000X · Licence 2017-0031 (NC)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD60983758 (WA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 0101235353 (VA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD191698 (OR)
Hospitalist Physician Taxonomy 208M00000X · Licence MD60983758 (WA)
Hospitalist Physician Taxonomy 208M00000X · Licence 2017-0031 (NC)

Record details

NPI number1871568113
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 21, 2006
Last updated in NPPESSeptember 20, 2023
Certification dateSeptember 20, 2023

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolUNIVERSITY OF CINCINNATI COLLEGE OF MEDICINE
Graduated 1997 (29 years in practice)
Group practice Legacy Clinics Llc — 718 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients106
Services billed 257 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 Legacy Clinics LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 718 clinicians in the practice; 12 are shown here.

Other providers in Keene