Mark L. Holbrook, M.D.
Internal Medicine Physician · Boise, ID
Mark L. Holbrook, M.D. is an internal medicine physician with a practice address in Boise, Idaho, and NPI 1205884616, issued on May 5, 2006. Check the license (Idaho M6850, as entered in NPPES) on the Idaho Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Mark L. Holbrook
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- M6850 ID
Self-reported in NPPES; status is on the state search - Practice location
- 4840 N Cloverdale RD, Boise, ID 83713
- Phone
- (208) 706-8000
- Enumerated
- May 5, 2006
- Record last updated
- Jan 23, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (208) 706-8001
- Medicare enrollment
- Enrolled (PECOS I20051209000689); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 1992
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 453 in Idaho → Look up another NPI →
Also registered at 4840 N Cloverdale RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jessica Allen, NPNurse Practitioner1184332421
- Susan Baxter, MDInternal Medicine Physician1417959842
- Maria Ewings, MDInternal Medicine Physician1255422747
- Cristina GabuttiInternal Medicine Physician1023506847
- Kailey KendallPharmacist1538785191
- Gretchen Kohler, MDInternal Medicine Physician1982698502
Verify Mark L. Holbrook in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIdaho Board of Medicine
Search for license M6850Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average internal medicine physician in 2024
8,038 Medicare Part D claims for 847 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 118 claims were for opioids.
Most prescribed
- Atorvastatin Calcium664 claims
- Levothyroxine Sodium486 claims
- Losartan Potassium331 claims
- Amlodipine Besylate304 claims
- Simvastatin240 claims
- Lisinopril224 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.
Bills Medicare through one group practice
- St Lukes Clinic-Treasure Valley LLCBoise, ID
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark L. Holbrook among 453 internal medicine physician records in Idaho
Mark L. Holbrook, M.D. is one of 453 internal medicine physician records with a practice address in Idaho. 73% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 63% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated1992 · median 2011 among the 254 with a school on file
- Record last updated2014 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Idaho practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
217 internal medicine physician records list a practice address in Boise
They are 217 of the 9,467 NPPES records with a practice address in Boise, and 453 internal medicine physician records in Idaho.
All 453 in Idaho → Every provider in Boise → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Susan Baxter, MDBoise, ID 837131417959842
- Jason Bronner, MDBoise, ID 837131245267541
- Maria Ewings, MDBoise, ID 837131255422747
- Cristina GabuttiBoise, ID 837131023506847
- Gretchen Kohler, MDBoise, ID 837131982698502
- Snehlata Mehta, MDBoise, ID 837131851331045
- Andrew Nguyen, MDBoise, ID 837131669113841
- David Nielsen, MDBoise, ID 837131821048364
Common questions
What is Mark L. Holbrook, M.D.'s NPI number?
Mark L. Holbrook, M.D.'s National Provider Identifier (NPI) is 1205884616, issued on May 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark L. Holbrook, M.D. located?
The NPPES record lists a practice address at 4840 N Cloverdale RD, Boise, ID, 83713. Phone: (208) 706-8000. Providers update this record themselves, so call before visiting.
How can I verify Mark L. Holbrook, M.D.'s license?
NPPES lists Idaho license number M6850, 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 Mark L. Holbrook, M.D. prescribe under Medicare Part D?
In 2024, Mark L. Holbrook, M.D. had 8,038 Medicare Part D claims for 847 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.