David P. Chamberlain, M.D.
Internal Medicine Physician · Butte, MT
David P. Chamberlain, M.D. is an internal medicine physician with a practice address in Butte, Montana, and NPI 1861423071, issued on Jul 5, 2006. Check the license (Montana 9601, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- David P. Chamberlain
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 9601 MT
Self-reported in NPPES; status is on the state search - Practice location
- 300 W Mercury St, Butte, MT 59701
- Phone
- (406) 723-1300
- Enumerated
- Jul 5, 2006
- Record last updated
- Jan 11, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (406) 723-1360
- Medicare enrollment
- Enrolled (PECOS I20060103000831); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Columbia School Of Medicine, 1997
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 324 in Montana → Look up another NPI →
Also registered at 300 W Mercury St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Florian Cortese, M.D.Internal Medicine Physician1609804228
- Dannielle Hall, PA-CPhysician Assistant1194129874
- Kenneth Hunt, M.D.Legal Medicine1265463475
- Jeanne Mehrens, P A CPhysician Assistant1285854034
- John Pullman, MDInternal Medicine Physician1518998426
- Jacqueline ReillyNutritionist1043430804
Verify David P. Chamberlain in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 9601Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.8 times the Medicare Part D claims of the average internal medicine physician in 2024
8,979 Medicare Part D claims for 423 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 141 claims were for opioids.
Most prescribed
- Atorvastatin Calcium642 claims
- Levothyroxine Sodium414 claims
- Amlodipine Besylate396 claims
- Lisinopril322 claims
- Gabapentin317 claims
- Omeprazole244 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: $1,683.17
78 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. 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.
Bills Medicare through one group practice
- Mercury Street Medical Group PLLCButte, MT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David P. Chamberlain among 324 internal medicine physician records in Montana
David P. Chamberlain, 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 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
- Graduated1997 · median 2006 among the 191 with a school on file
- Record last updated2017 · 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).
14 internal medicine physician records list a practice address in Butte
They are 14 of the 744 NPPES records with a practice address in Butte, and 324 internal medicine physician records in Montana.
All 324 in Montana → Every provider in Butte → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jonathan Bodine, D.O.Butte, MT 597011760434740
- Florian Cortese, M.D.Butte, MT 597011609804228
- James Drynan, MDButte, MT 597011053480772
- Joe Gregory, DOButte, MT 597011336127463
- Kyler KingstonButte, MT 597011447713250
- Ian Macdonald, DOButte, MT 597011093207318
- John Pullman, MDButte, MT 597011518998426
- Michael Rhodes, M.D.Butte, MT 597011427212729
Common questions
What is David P. Chamberlain, M.D.'s NPI number?
David P. Chamberlain, M.D.'s National Provider Identifier (NPI) is 1861423071, issued on Jul 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is David P. Chamberlain, M.D. located?
The NPPES record lists a practice address at 300 W Mercury St, Butte, MT, 59701. Phone: (406) 723-1300. Providers update this record themselves, so call before visiting.
How can I verify David P. Chamberlain, M.D.'s license?
NPPES lists Montana license number 9601, 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 P. Chamberlain, M.D. prescribe under Medicare Part D?
In 2024, David P. Chamberlain, M.D. had 8,979 Medicare Part D claims for 423 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.