NPI registry status
Active
2026 NPPES data Hematology & Oncology Physician NPI 1851385330 MD
Verify on CMS → Michael Bergen, MD
Hematology & Oncology Physician in Montrose, 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 11,232 in Hematology & Oncology 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
618
Medicare Part D claims · 119 beneficiaries · Hematology & Oncology Physician avg: 847
What the federal data shows
Michael Bergen, MD filed 618 Medicare Part D claims in 2023 as a Hematology & Oncology Physician in Montrose, Colorado.
- 618
- Part D claims, 2023
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.
Michael Bergen, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
618 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-eligible specialty (heuristic, not verified)
Michael Bergen, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Michael Bergen, MD?
Quality data not reportedPrimary specialty
Hematology & Oncology Physician
Medicare Part D claims
618 27% vs specialty avg
Specialty distribution in Colorado
How Hematology & Oncology 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 Hematology & Oncology 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).
Michael Bergen, MD appears in the CMS NPPES registry as a Hematology & Oncology Physician provider holding MD credentials at 600 S 5TH ST, Montrose, CO, 81401, with a listed phone of (970) 497-8001. NPI 1851385330 was issued on 09/09/2005.
Medicare Part D records for calendar year 2023 show 618 prescription claims written by this provider, covering 119 Medicare beneficiaries and totaling roughly $2.1 million in drug spend, with an opioid prescribing rate of 7.0%.
Hematology & Oncology Physician is a mid-sized specialty nationwide, with 11,232 enrolled providers across 54 states and an average of 847 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 | 1851385330 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/09/2005 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
618
Total Claims
$2.1M
Total Drug Cost
119
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 925
- Total Day Supply
- 24,897
- Generic Drug Cost
- $197K
- Opioid Claims
- 43 (7.0% rate)
- Antibiotic Claims
- 21
Patient Demographics
- Average Patient Age
- 74.3 years
- Avg HCC Risk Score
- 2.14
- Gender Split
- 61% female / 39% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Michael Bergen, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Letrozole
Letrozole
57 claims
- Xtandi
Xtandi
31 claims
- Dexamethasone
Dexamethasone
29 claims
- Prednisone
Prednisone
29 claims
- Ninlaro
Ninlaro
27 claims
- Acyclovir
Acyclovir
24 claims
- Revlimid
Revlimid
23 claims
- Oxycodone Hcl 21
Oxycodone Hcl
21 claims
| Drug | Claims |
|---|---|
| Letrozole | 57 |
| Xtandi Enzalutamide | 31 |
| Dexamethasone | 29 |
| Prednisone | 29 |
| Ninlaro Ixazomib Citrate | 27 |
| Acyclovir | 24 |
| Revlimid Lenalidomide | 23 |
| Oxycodone Hcl | 21 |
| Gabapentin | 20 |
| Bicalutamide | 19 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hematology & Oncology Physician Overview
How Michael Bergen, MD fits within the Hematology & Oncology Physician landscape nationally.
11,232
Hematology & Oncology Physician Providers in US
54
States with Hematology & Oncology Physician
847
Avg Claims per Provider
Michael Bergen, MD's 618 claims are below the specialty average of 847.
Nearby Hematology & Oncology Physician Providers in Colorado
Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as Bergen.
Dr. Anosheh Afghahi
MD
Aurora, CO
Dr. Raul Alvarez
M.D.
Englewood, CO
Dr. Maria Amaya
MD
Aurora, CO
Dr. David Andorsky
MD
Boulder, CO
Dr. Travis Archuleta
MD
Pueblo, CO
Compare Hematology & Oncology 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 Hematology & Oncology 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 Michael Bergen, MD's specialty? ▼
Michael Bergen, MD specializes in Hematology & Oncology Physician and practices in Montrose, Colorado. Credentials: MD.
How much does Michael Bergen, MD prescribe under Medicare Part D? ▼
In 2023, Michael Bergen, MD wrote 618 Medicare Part D claims totaling $2.1M in drug costs for 119 beneficiaries.
Where is Michael Bergen, MD located? ▼
Michael Bergen, MD is located at 600 S 5TH ST, Montrose, CO, 81401. Phone: (970) 497-8001.
What is Michael Bergen, MD's NPI number? ▼
Michael Bergen, MD's National Provider Identifier (NPI) is 1851385330, issued on 09/09/2005.
Does Michael Bergen, MD prescribe opioids? ▼
Yes, Michael Bergen, MD had 43 opioid claims in 2023 with an opioid prescribing rate of 7.0%.
How many Hematology & Oncology Physician providers are there in the US? ▼
There are 11,232 Hematology & Oncology Physician providers across 54 states in the US. The average Hematology & Oncology Physician provider writes 847 Medicare Part D claims per year.
What drugs does Michael Bergen, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Michael Bergen, MD's most frequently prescribed drugs include Letrozole, Xtandi, Dexamethasone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Michael Bergen, MD accept Medicare? ▼
Michael Bergen, MD appears in CMS Medicare data with 618 Part D claims and 119 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Michael Bergen, MD's credentials? ▼
Michael Bergen, MD's NPI is 1851385330 with credentials MD. 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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.