David Andrew Mark, M.D.
Internal Medicine Physician · Hardin, MT
David Andrew Mark, M.D. is an internal medicine physician with a practice address in Hardin, Montana, and NPI 1023166840, issued on Jan 8, 2007. Check the license (Montana MED-PHYS-LIC-12540, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- David Andrew Mark
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MED-PHYS-LIC-12540 MT
Self-reported in NPPES; status is on the state search - Practice location
- 402 N Center Ave, Hardin, MT 59034
- Phone
- (406) 655-4103
- Enumerated
- Jan 8, 2007
- Record last updated
- Jul 27, 2026
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 324 in Montana → Look up another NPI →
Verify David Andrew Mark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license MED-PHYS-LIC-12540Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 100% of the cost of the top drugs
111 Medicare Part D claims for 86 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 87% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Arexvy66 claims
- Shingrix22 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.
David Andrew Mark among 324 internal medicine physician records in Montana
David Andrew Mark, M.D. is one of 324 internal medicine physician records with a practice address in Montana. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 56% of them.
- NPI issued2007 · 56% of these records are older, 38% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2026 · 52% 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 Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 internal medicine physician records list a practice address in Hardin
They are 3 of the 60 NPPES records with a practice address in Hardin, and 324 internal medicine physician records in Montana.
All 324 in Montana → Every provider in Hardin → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Robert Byron, MDHardin, MT 590341053355727
- Carol Greimann, MDHardin, MT 590341871540187
- Damon Martin, M.D.Lame Deer, MT 590431932239860
- Aster Berhane, M.DCrow Agency, MT 590221528276003
- Laurel Desnick, MDLivingston, MT 590471841376639
- Henry Pinango, MDLivingston, MT 590471427488204
- James Rowe, MDLivingston, MT 590471295843183
- Ted Scofield, MDLivingston, MT 590471790893634
Common questions
What is David Andrew Mark, M.D.'s NPI number?
David Andrew Mark, M.D.'s National Provider Identifier (NPI) is 1023166840, issued on Jan 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is David Andrew Mark, M.D. located?
The NPPES record lists a practice address at 402 N Center Ave, Hardin, MT, 59034. Phone: (406) 655-4103. Providers update this record themselves, so call before visiting.
How can I verify David Andrew Mark, M.D.'s license?
NPPES lists Montana license number MED-PHYS-LIC-12540, as entered by the provider. Search the Montana Board of Medical Examiners at https://ebiz.mt.gov/POL/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does David Andrew Mark, M.D. prescribe under Medicare Part D?
In 2024, David Andrew Mark, M.D. had 111 Medicare Part D claims for 86 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.