Mark Dalton, D.O.
Internal Medicine Physician · Missoula, MT
Mark Dalton, D.O. is an internal medicine physician with a practice address in Missoula, Montana, and NPI 1093782138, issued on Mar 8, 2006. Check the license (Montana MED-PHYS-LIC-34175, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Mark Dalton
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- MED-PHYS-LIC-34175 MT
O0822 ID
Self-reported in NPPES; status is on the state search - Practice location
- 500 W Broadway St, Missoula, MT 59802
- Phone
- (406) 543-7271
- Enumerated
- Mar 8, 2006
- Record last updated
- Jun 6, 2023
- Fax
- (406) 327-1834
- Medicare enrollment
- Enrolled (PECOS I20071120000544); accepts Medicare assignment
- Medical or professional school
- Des Moines University Of Osteopathic Medicine And Health Sciences, 2000
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 324 in Montana → Look up another NPI →
Also registered at 500 W Broadway St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Travis Abicht, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1033239835
- Charles Acher, MDColon & Rectal Surgery Physician1033472519
- Ryan Adams, MDInternal Medicine Physician1790952653
- Bodee Alt, APRNFamily Nurse Practitioner1174993703
- Casey Ambrose, MDEmergency Medicine Physician1669892576
- Rebecca Anderson, MDInternal Medicine Physician1437173440
Verify Mark Dalton 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-34175Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average internal medicine physician in 2024
485 Medicare Part D claims for 149 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 23 claims were for opioids.
Most prescribed
- Doxycycline Hyclate31 claims
- Prednisone27 claims
- Cefdinir25 claims
- Atorvastatin Calcium24 claims
- Clopidogrel19 claims
- Metoprolol Succinate18 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
- Missouri HB Medical Services LLCPoplar Bluff, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Dalton among 324 internal medicine physician records in Montana
Mark Dalton, D.O. 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 44% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2000 · median 2006 among the 191 with a school on file
- Record last updated2023 · 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).
47 internal medicine physician records list a practice address in Missoula
They are 47 of the 3,567 NPPES records with a practice address in Missoula, and 324 internal medicine physician records in Montana.
All 324 in Montana → Every provider in Missoula → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- J Caldwell, MDMissoula, MT 598021518911924
- Michael Curtis, MDMissoula, MT 598021447291109
- Kasey Harbine, MDMissoula, MT 598021598717563
- Hugh Hughson, MDMissoula, MT 598021528012937
- Mary Langenderfer, MDMissoula, MT 598021871548537
- Lisa Milch, M.D.Missoula, MT 598021679527105
- Anne Murphy, MDMissoula, MT 598021124074232
- Mary Quandt, MDMissoula, MT 598021487695607
Common questions
What is Mark Dalton, D.O.'s NPI number?
Mark Dalton, D.O.'s National Provider Identifier (NPI) is 1093782138, issued on Mar 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Dalton, D.O. located?
The NPPES record lists a practice address at 500 W Broadway St, Missoula, MT, 59802. Phone: (406) 543-7271. Providers update this record themselves, so call before visiting.
How can I verify Mark Dalton, D.O.'s license?
NPPES lists Montana license number MED-PHYS-LIC-34175, 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 Mark Dalton, D.O. prescribe under Medicare Part D?
In 2024, Mark Dalton, D.O. had 485 Medicare Part D claims for 149 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.