NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1366579245 M.D.
Verify on CMS → Mark Huun, M.D.
Internal Medicine Physician in Denver, Colorado.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,858 in Internal Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
693
Medicare Part D claims · 291 beneficiaries · Internal Medicine Physician avg: 3K
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark Huun, M.D. filed 693 Medicare Part D claims in 2023 as a Internal Medicine Physician in Denver, Colorado.
- 693
- Part D claims, 2023
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Mark Huun, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
693 Top 31% higher than 69% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Mark Huun, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mark Huun, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
693 74% vs specialty avg
Specialty distribution in Colorado
How Internal Medicine Physician compares to other specialties among Colorado providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Internal Medicine Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Mark Huun, M.D. appears in the CMS NPPES registry as a Internal Medicine Physician provider holding M.D. credentials at 1515 WAZEE ST, Denver, CO, 80202, with a listed phone of (303) 534-9550. NPI 1366579245 was issued on 02/27/2007.
Medicare Part D records for calendar year 2023 show 693 prescription claims written by this provider, covering 291 Medicare beneficiaries and totaling roughly $45K in drug spend.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,858 enrolled providers across 56 states and an average of 2,716 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1366579245 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 02/27/2007 |
Hospital and facility affiliations
Facilities where Mark Huun, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Delta County Memorial Hospital
★★★☆☆ 3/5
Delta, CO
Acute Care Hospitals
CMS CCN: 060071
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
693
Total Claims
$45K
Total Drug Cost
291
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,313
- Total Day Supply
- 34,305
- Generic Drug Cost
- $12K
- Antibiotic Claims
- 98
Patient Demographics
- Average Patient Age
- 75.1 years
- Avg HCC Risk Score
- 1.22
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 24, 65-74: 107, 75-84: 125, 85+: 35
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Huun, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisone
Prednisone
52 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
39 claims
- Amlodipine Besylate
Amlodipine Besylate
36 claims
- Omeprazole
Omeprazole
32 claims
- Metoprolol Succinate
Metoprolol Succinate
25 claims
- Levothyroxine Sodium
Levothyroxine Sodium
24 claims
- Glipizide 20
Glipizide
20 claims
- Lisinopril 19
Lisinopril
19 claims
| Drug | Claims |
|---|---|
| Prednisone | 52 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 39 |
| Amlodipine Besylate | 36 |
| Omeprazole | 32 |
| Metoprolol Succinate | 25 |
| Levothyroxine Sodium | 24 |
| Glipizide | 20 |
| Lisinopril | 19 |
| Simvastatin | 16 |
| Cephalexin | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Mark Huun, M.D. fits within the Internal Medicine Physician landscape nationally.
172,858
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Mark Huun, M.D.'s 693 claims are below the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Colorado
Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as Huun.
Dr. Emily Aaron
MD
Denver, CO
Dr. Cynthia Abacan
MD
Pueblo, CO
Dr. David Abbey
MS MD
Fort Collins, CO
Dr. Ahmed Abdulrahman
MD
Pueblo, CO
Dr. Victor Abela
D.O.
Denver, CO
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Colorado medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal Medicine Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Mark Huun, M.D.'s specialty? ▼
Mark Huun, M.D. specializes in Internal Medicine Physician and practices in Denver, Colorado. Credentials: M.D..
How much does Mark Huun, M.D. prescribe under Medicare Part D? ▼
In 2023, Mark Huun, M.D. wrote 693 Medicare Part D claims totaling $45K in drug costs for 291 beneficiaries.
Where is Mark Huun, M.D. located? ▼
Mark Huun, M.D. is located at 1515 WAZEE ST, Denver, CO, 80202. Phone: (303) 534-9550.
What is Mark Huun, M.D.'s NPI number? ▼
Mark Huun, M.D.'s National Provider Identifier (NPI) is 1366579245, issued on 02/27/2007.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,858 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Mark Huun, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Huun, M.D.'s most frequently prescribed drugs include Prednisone, Amoxicillin-Clavulanate Potass, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Huun, M.D. accept Medicare? ▼
Mark Huun, M.D. appears in CMS Medicare data with 693 Part D claims and 291 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Huun, M.D.'s credentials? ▼
Mark Huun, M.D.'s NPI is 1366579245 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.