Samuel James Mast, M.D.
Internal Medicine Physician · Fort Collins, CO
Samuel James Mast, M.D. is an internal medicine physician with a practice address in Fort Collins, Colorado, and NPI 1780970426, issued on Jun 21, 2011. Check the license (Colorado 0053404, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Samuel James Mast
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 0053404 CO
Self-reported in NPPES; status is on the state search - Practice location
- 2950 E Harmony RD, Fort Collins, CO 80528
- Phone
- (303) 338-4545
- Enumerated
- Jun 21, 2011
- Record last updated
- Apr 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 01607201 CO
- Medicare enrollment
- Enrolled (PECOS I20141112001857); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 2950 E Harmony RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elvira Iancu, MDFamily Medicine Physician1063448652
- Tiffany Toth, D.O.Family Medicine Physician1912149576
- Jeffry Winkler, P.A.Physician Assistant1265552459
- Laura Winstead, M.D.Psychiatry Physician1659372852
Verify Samuel James Mast in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 0053404Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
7,004 Medicare Part D claims for 524 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 218 claims were for opioids.
Most prescribed
- Atorvastatin Calcium454 claims
- Levothyroxine Sodium353 claims
- Lisinopril271 claims
- Amlodipine Besylate247 claims
- Losartan Potassium228 claims
- Rosuvastatin Calcium226 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
- Colorado Permanente Medical Group PCFort Collins, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Samuel James Mast among 2,046 internal medicine physician records in Colorado
Samuel James Mast, M.D. is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 69% of them.
- NPI issued2011 · 69% of these records are older, 28% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2011 · median 2006 among the 1,090 with a school on file
- Record last updated2021 · 61% 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 Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in Colorado
There are 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Fort Collins → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nathan Brinn, MDFort Collins, CO 805281851377071
- Carrie Campbell Broughton, MDFort Collins, CO 805281295737526
- Nicola Demacopoulos, MDFort Collins, CO 805281205813839
- Jennifer Hendrick, MDFort Collins, CO 805281144256728
- Robert Juhala, MDFort Collins, CO 805281851329973
- Helen Kilzer, MDFort Collins, CO 805281538182993
- Christina Lang, M.D.Fort Collins, CO 805281639274285
- Dilaawar Mistry, M.D.Fort Collins, CO 805281437299468
Common questions
What is Samuel James Mast, M.D.'s NPI number?
Samuel James Mast, M.D.'s National Provider Identifier (NPI) is 1780970426, issued on Jun 21, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Samuel James Mast, M.D. located?
The NPPES record lists a practice address at 2950 E Harmony RD, Fort Collins, CO, 80528. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Samuel James Mast, M.D.'s license?
NPPES lists Colorado license number 0053404, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Samuel James Mast, M.D. prescribe under Medicare Part D?
In 2024, Samuel James Mast, M.D. had 7,004 Medicare Part D claims for 524 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.