Dr. David J. Mast, MD
- Medicare services, 2024
- 362
- Medicare patients, 2024
- 146
- Part D claims, 2024
- 7,340
- Hospital affiliations
- 3
- Industry payments
- $3,833
- Practice address
- 915 East 1st Street, Duluth, MN 55805
- Practice phone
- Call (218) 249-5555
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mast's professional email, personal email and mobile number
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Dr. David J. Mast is an internist in Duluth, Minnesota
Dr. Mast practices at Aspirus St. Luke's Hospital in Duluth, Minnesota, part of Aspirus.
Dr. Mast's NPI, 1912958331, was assigned on May 12, 2006. Dr. Mast graduated from University of Minnesota Medical School in 1985. Dr. Mast holds Minnesota license 30485.
- NPI
- 1912958331NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4688586258
- NPI enumeration date
- May 12, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (218) 249-5555
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David J. Mast practices at Aspirus St. Luke's Hospital in Duluth, Minnesota
Dr. Mast's primary practice is Aspirus St. Luke's Hospital, at 915 East 1st Street, Duluth, MN 55805 in St. Louis County. The practice phone is (218) 249-5555.
- Aspirus St. Luke's Hospital915 East 1st Street, Duluth, MN 55805 · St. Louis CountyPhone(218) 249-5555
Source: Dmand AI Affiliation Data
Dr. David J. Mast is affiliated with 7 sites of care and 2 medical groups
Dr. Mast's primary practice is Aspirus St. Luke's Hospital in Duluth, Minnesota, part of Aspirus. Dr. Mast is also affiliated with Essentia Health-Duluth (Miller-Dwan, Building D). The medical group on file is Aspirus St. Luke's Hospital. Dmand AI also links Dr. Mast to 1 more hospital, 2 group practices and clinics, 1 home health agency, 1 hospice and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. David J. Mast's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mast practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Aspirus St. Luke's Hospital | Available with a free account |
| +6 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Aspirus and 6.2K+ hospitals, with verified contacts in the same login.
Dr. David J. Mast is one of 2,322 internists in Minnesota
Internal medicine is Dr. Mast's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Mast is licensed in Minnesota.
Specialties and state licenses
- Internal medicine, MinnesotaPrimary
Internists near Dr. Mast
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. David J. Mast billed Medicare for 362 services in 2024
CMS data shows 362 Medicare services from Dr. Mast across 8 procedure codes in 2024, for 146 Medicare patients. Medicare paid $28,254 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Mast's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4672024: 29038%
- Other services
- 2023: 642024: 7213%
Dr. Mast compared with the Minnesota median for internists, 2024
- Dr. Mast
- Minnesota median
- Medicare services
- 362vs 3368% above
- Medicare patients
- 146vs 148Close to median
- Part D claims
- 6,566vs 14445.6 times
Medians across 2,238 internists in Minnesota with Dmand AI profiles that report each measure.
Dr. Mast's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Mast?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mast and other internists in Minnesota.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. David J. Mast treated 146 Medicare patients in 2024, average age 75
CMS counts 146 Medicare patients who saw Dr. Mast in 2024. The largest group is 75 to 84, with 56 patients. 72% of them have high blood pressure, and 65% have high cholesterol. 17% are also on Medicaid. Their average risk score is 1.27, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Mast's median patient age at 75, with 37% women.
Dr. Mast's Medicare patients by age, 2024
Dr. Mast's Medicare patients by sex, 2024
- Women5538%
- Men9162%
Chronic conditions among Dr. Mast's Medicare patients, 2024
- High blood pressure72%
- High cholesterol65%
- Arthritis42%
- Ischemic heart disease29%
- Diabetes27%
- Atrial fibrillation24%
- Mood disorders21%
- Anxiety20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mast's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women37%
- Men63%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. David J. Mast wrote 7,340 Medicare Part D claims in 2024
In 2024, Dr. Mast wrote 7,340 Medicare Part D claims for 538 patients. 89% of them were for generic drugs. CMS names the drug for 6,566 of them, across 109 drugs with 11 or more claims each, at $470,469 in total drug cost. In 2023, CMS named 7,346 claims across 121 drugs.
Dr. Mast's Part D claims by kind of drug, 2024
- Generic6,552 claims89%
- Brand-name759 claims10%
- Other29 claims0%
Dr. Mast's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Mast's Part D claims, 2024
- Opioids2%143 of 7,340 claims
- Antibiotics1%97 of 7,340 claims
- Antipsychotics, patients 65 and over1%56 of 7,340 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 7,3462024: 6,56611%
Drugs named by CMS: 109 in 2024, 121 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. David J. Mast takes part in Medicare
Dr. Mast accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. David J. Mast received $3,833 in industry payments from 2016 to 2024
CMS Open Payments shows 23 general payments to Dr. Mast from 9 drug and device companies from 2016 to 2024. Speaker and faculty fees make up the largest share, 86% of the total. Medtronic, Inc. paid the most, $3,620.
General payments to Dr. Mast by program year, 2016 to 2024
General payments to Dr. Mast by kind, 2016 to 2024
- Speaker and faculty fees$3,29086%
- Food and beverage$52814%
- Education$140%
- Travel and lodging$10%
Companies that paid Dr. Mast the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. David J. Mast graduated from University of Minnesota Medical School
Dr. Mast graduated from University of Minnesota Medical School in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. David J. Mast's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. David J. Mast
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. David J. Mast's NPI number?
Dr. David J. Mast's NPI number is 1912958331. It was assigned on May 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. David J. Mast?
Dr. David J. Mast is an internist in Duluth, Minnesota. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. David J. Mast practice?
Dr. Mast practices at 915 East 1st Street, Duluth, MN 55805. Dr. Mast's primary practice is Aspirus St. Luke's Hospital in Duluth, Minnesota, part of Aspirus. Dmand AI also links Dr. Mast to 1 hospital, 2 group practices and clinics, 1 home health agency, 1 hospice and 1 medical group.
What is Dr. David J. Mast's office phone number?
The practice phone on file for Dr. Mast is (218) 249-5555.
What is Dr. David J. Mast's medical license number?
Dr. Mast holds Minnesota license 30485.
Which hospitals is Dr. David J. Mast affiliated with?
Dr. Mast practices at Aspirus St. Luke's Hospital in Duluth, Minnesota. Dr. Mast is also affiliated with Essentia Health-Duluth (Miller-Dwan, Building D). Dmand AI links Dr. Mast to 1 more hospital.
What medical group is Dr. David J. Mast part of?
Dr. Mast is linked to Aspirus St. Luke's Hospital. Dmand AI links Dr. Mast to 1 more medical group.
Does Dr. David J. Mast accept Medicare?
Yes. CMS data shows Dr. Mast billed Medicare for 362 services in 2024, and Dr. Mast accepts Medicare assignment.
How many Medicare patients does Dr. David J. Mast see?
CMS counts 146 Medicare patients who saw Dr. Mast in 2024, with an average age of 75.
What services does Dr. David J. Mast bill to Medicare?
In 2024, Dr. Mast's most billed Medicare services were office visit, established patient (99214), hospital inpatient care (99233) and medicare service (G0439).
Show 4 more questionsShow fewer questions
Where did Dr. David J. Mast go to medical school?
Dr. Mast graduated from University of Minnesota Medical School in 1985.
What drugs does Dr. David J. Mast prescribe most?
In 2024 Medicare Part D data, Dr. Mast's most prescribed drugs by claims were Lisinopril, Atorvastatin Calcium and Metoprolol Succinate.
Has Dr. David J. Mast received payments from drug or device companies?
CMS Open Payments shows $3,833 in general payments to Dr. Mast from 9 companies from 2016 to 2024. The largest total came from Medtronic, Inc.
How long has Dr. David J. Mast been practicing?
Dr. Mast graduated from medical school in 1985, 41 years ago.
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