Jack O. Clark, M.D.
Internal Medicine Physician · Rexburg, ID
Jack O. Clark, M.D. is an internal medicine physician with a practice address in Rexburg, Idaho, and NPI 1902992837, issued on Oct 5, 2006. Check the license (Idaho M-7743, as entered in NPPES) on the Idaho Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Jack O. Clark
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- M-7743 ID
Self-reported in NPPES; status is on the state search - Practice location
- 450 E Main St, Rexburg, ID 83440
- Phone
- (208) 359-6419
- Enumerated
- Oct 5, 2006
- Record last updated
- Apr 13, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (208) 356-3111
- Medicaid IDs
- 114780300 WY
80633500 ID
805499200 ID - Medicare enrollment
- Enrolled (PECOS I20100722000929); accepts Medicare assignment
- Medical or professional school
- Pennsylvania State University College Of Medicine, 1999
- Entity
- Type 1 · individual
Also registered at 450 E Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lorinda AllredNeurodevelopmental Disabilities Physician1588542161
- David Anderson, RPHPharmacist1376192674
- Michael Anderson, D.O.Emergency Medical Services (Emergency Medicine) Physician1194019406
- Melissa Black, FNP-CFamily Nurse Practitioner1659077238
- Debra Brand, MDEmergency Medicine Physician1750472379
- Michael Brunson, PHARMDPharmacist1356189146
Verify Jack O. Clark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIdaho Board of Medicine
Search for license M-7743Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,432 Medicare Part D claims for 76 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 78 claims were for opioids.
Most prescribed
- Warfarin Sodium51 claims
- Gabapentin48 claims
- Duloxetine Hcl44 claims
- Trazodone Hcl42 claims
- Atorvastatin Calcium40 claims
- Pantoprazole Sodium39 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.
Industry payments in 2024: $80.42
1 payment: food and beverage; the largest payer was Stryker Corporation. The 50,334 providers of this specialty with any payment received $1,303.06 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.
2 hospitals and group practices
- Madison CO Memorial HospitalRexburg, ID
- Madison Memorial HospitalReburg, ID · Acute Care Hospitals
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov).
Internal Medicine Physician providers in Idaho
There are 453 internal medicine physician records in Idaho.
Other internal medicine physician records in Idaho
- Ann Agnew, MDMeridian, ID1497797302
- Harsh Vardhan Agrawal, MDCaldwell, ID1760663900
- Tausha AllenIdaho Falls, ID1558822379
- Uzochukwu Amadi, MDNampa, ID1689961088
- Sarai Ambert-Pompey, MDBoise, ID1972810638
- Douglas Andersen, DOPocatello, ID1730599598
- Krista Andersen-Harris, DOPocatello, ID1548216252
- Jennifer Anderson, MDBoise, ID1093825903
- Philip Anderson, DOBoise, ID1154997104
- Shane Anderson, D.O.Malad City, ID1841289659
Common questions
What is Jack O. Clark, M.D.'s NPI number?
Jack O. Clark, M.D.'s National Provider Identifier (NPI) is 1902992837, issued on Oct 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jack O. Clark, M.D. located?
The NPPES record lists a practice address at 450 E Main St, Rexburg, ID, 83440. Phone: (208) 359-6419. Providers update this record themselves, so call before visiting.
How can I verify Jack O. Clark, M.D.'s license?
NPPES lists Idaho license number M-7743, as entered by the provider. Search the Idaho Board of Medicine at https://dopl.idaho.gov/bom/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jack O. Clark, M.D. prescribe under Medicare Part D?
In 2024, Jack O. Clark, M.D. had 1,432 Medicare Part D claims for 76 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.