Dr. David Andrew Mark, MD
- Medicare services, 2021
- 59
- Part D claims, 2024
- 111
- Hospital affiliations
- 1
- Industry payments
- $14
- Medical groups
- 3
- Practice address
- 1233 N 30th St, Billings, MT 59101
- Practice phone
- Call (406) 237-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St Vincent Healthcare
Billings, Montana
Find Dr. Mark's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. David Andrew Mark is an internist in Billings, Montana
Dr. Mark practices at St Vincent Healthcare in Billings, Montana.
Dr. Mark's NPI, 1023166840, was assigned on January 8, 2007. Dr. Mark graduated from Harvard Medical School in 1999. Dr. Mark holds Montana license 12450.
- NPI
- 1023166840NPI Registry (opens in a new tab)
- NPI enumeration date
- January 8, 2007
- NPI status
- Active
- Practice phone
- (406) 237-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. David Andrew Mark practices at St Vincent Healthcare in Billings, Montana
Dr. Mark's primary practice is St Vincent Healthcare, at 1233 N 30th St, Billings, MT 59101 in Yellowstone County. The practice phone is (406) 237-7000.
- St Vincent Healthcare1233 N 30th St, Billings, MT 59101 · Yellowstone CountyPhone(406) 237-7000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. David Andrew Mark is affiliated with 2 sites of care and 3 medical groups
Dr. Mark's primary practice is St Vincent Healthcare in Billings, Montana. Dr. Mark is also affiliated with Big Horn Hospital. The medical group on file is Verne E. Gibbs Health Center. Dmand AI also links Dr. Mark to 2 more medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. David Andrew Mark's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mark practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St Vincent Healthcare | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. David Andrew Mark is one of 311 internists in Montana
Internal medicine is Dr. Mark's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Mark is licensed in Montana.
Specialties and state licenses
- Internal medicine, MontanaPrimary
Internists near Dr. Mark
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 Andrew Mark billed Medicare for 59 services in 2021
CMS data shows 59 Medicare services from Dr. Mark across 1 procedure code in 2021. Medicare paid $3,112 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Mark's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 972021: 5939%
Dr. Mark compared with the Montana median for internists, 2021
- Dr. Mark
- Montana median
- Medicare services
- 59vs 47688% below
- Part D claims
- 88vs 14338% below
Medians across 340 internists in Montana with Dmand AI profiles that report each measure.
Dr. Mark's most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mark and other internists in Montana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. David Andrew Mark's patients have a median age of 36
Across all payers, Dmand AI patient panel data puts Dr. Mark's median patient age at 36, with 63% women.
Dr. Mark's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 36
Patient panel by sex, all payers
- Women63%
- Men37%
Source: Dmand AI Patient Panel Data
Dr. David Andrew Mark wrote 111 Medicare Part D claims in 2024
In 2024, Dr. Mark wrote 111 Medicare Part D claims for 86 patients. 13% of them were for generic drugs. CMS names the drug for 88 of them, across 2 drugs with 11 or more claims each, at $25,495 in total drug cost. In 2023, CMS named 30 claims across 1 drug.
Dr. Mark's Part D claims by kind of drug, 2024
- Generic14 claims13%
- Brand-name97 claims87%
Dr. Mark'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 302024: 88193%
Drugs named by CMS: 2 in 2024, 1 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
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Dr. David Andrew Mark received $14 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Mark from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Gilead Sciences, Inc. paid the most, $14.
Companies that paid Dr. Mark the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. David Andrew Mark graduated from Harvard Medical School
Dr. Mark graduated from Harvard Medical School in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. David Andrew Mark'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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 Data |
| 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) |
| 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 Andrew Mark
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 Andrew Mark's NPI number?
Dr. David Andrew Mark's NPI number is 1023166840. It was assigned on January 8, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. David Andrew Mark?
Dr. David Andrew Mark is an internist in Billings, Montana. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. David Andrew Mark practice?
Dr. Mark practices at 1233 N 30th St, Billings, MT 59101. Dr. Mark's primary practice is St Vincent Healthcare in Billings, Montana. Dmand AI also links Dr. Mark to 2 medical groups.
What is Dr. David Andrew Mark's office phone number?
The practice phone on file for Dr. Mark is (406) 237-7000.
What is Dr. David Andrew Mark's medical license number?
Dr. Mark holds Montana license 12450.
Which hospitals is Dr. David Andrew Mark affiliated with?
Dr. Mark is affiliated with Big Horn Hospital.
What medical group is Dr. David Andrew Mark part of?
Dr. Mark is linked to Verne E. Gibbs Health Center. Dmand AI links Dr. Mark to 2 more medical groups.
Does Dr. David Andrew Mark accept Medicare?
Yes. CMS data shows Dr. Mark billed Medicare for 59 services in 2021.
What services does Dr. David Andrew Mark bill to Medicare?
In 2021, Dr. Mark's most billed Medicare services were hospital inpatient care (99232).
Where did Dr. David Andrew Mark go to medical school?
Dr. Mark graduated from Harvard Medical School in 1999.
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What drugs does Dr. David Andrew Mark prescribe most?
In 2024 Medicare Part D data, Dr. Mark's most prescribed drugs by claims were Arexvy and Shingrix.
Has Dr. David Andrew Mark received payments from drug or device companies?
CMS Open Payments shows $14 in general payments to Dr. Mark from 1 company from 2016 to 2016. The largest total came from Gilead Sciences, Inc.
How long has Dr. David Andrew Mark been practicing?
Dr. Mark graduated from medical school in 1999, 27 years ago.
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