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

Dr. John Madison Clair, DO

Individual provider Internal Medicine Physician · NPI 1427232354

Dr. John Madison Clair, DO is a Hospitalist in Williston, North Dakota. Graduated from West Virginia School of Osteopathic Medicine in 2006, 20 years ago. Practices with Mercy Medical Center, a 80-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in North Dakota and Nevada.

Years since qualifying
20
Trained at
West Virginia School of Osteopathic Medicine
Licensed in
ND, NV
In the registry since
2007
Specialties on file
4
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1301 15th Ave W
Williston, ND 58801-3821
Phone: (701) 774-7400
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 6857 W Charleston Blvd, Las Vegas, NV 89117-1600 — (702) 304-2144

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 13540 (ND)
Internal Medicine Physician Taxonomy 207R00000X · Licence DO1452 (NV)
Hospitalist Physician Taxonomy 208M00000X · Licence DO1452 (NV)
Hospitalist Physician Taxonomy 208M00000X · Licence 13540 (ND)

Record details

NPI number1427232354
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedDecember 27, 2007
Last updated in NPPESJuly 21, 2022

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Also practisesINTERNAL MEDICINE
Medical schoolWEST VIRGINIA SCHOOL OF OSTEOPATHIC MEDICINE
Graduated 2006 (20 years in practice)
Group practice Mercy Medical Center — 80 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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 patients99
Services billed 250 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. Those with a page here are linked.

  • Sidney Health Center Hospital · Sidney, MT
  • Chi St Alexius Health Williston Hospital · Williston, ND

Colleagues at Mercy Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 80 clinicians in the practice; 12 are shown here.

Other providers in Williston