NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1245226323 MD
Verify on CMS → Karen Denbesten, MD
Infectious Disease Physician in Petoskey, Michigan.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 8,314 in Infectious Disease 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
519
Medicare Part D claims · 107 beneficiaries · Infectious Disease Physician avg: 816
Generic prescribing
80%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$18.82
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Karen Denbesten, MD filed 519 Medicare Part D claims in 2023 as a Infectious Disease Physician in Petoskey, Michigan, prescribing 80% generic.
- 519
- Part D claims, 2023
- 80%
- generic prescribing
- 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.
Karen Denbesten, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
519 Top 34% higher than 66% 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)
Karen Denbesten, MD 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 Karen Denbesten, MD?
Quality data not reportedPrimary specialty
Infectious Disease Physician
Medicare Part D claims
519 36% vs specialty avg
Specialty distribution in Michigan
How Infectious Disease Physician compares to other specialties among Michigan 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 Infectious Disease 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).
Karen Denbesten, MD appears in the CMS NPPES registry as an Infectious Disease Physician provider holding MD credentials at 560 W MITCHELL ST, Petoskey, MI, 49770, with a listed phone of (231) 487-3590. NPI 1245226323 was issued on 09/23/2005.
Medicare Part D records for calendar year 2023 show 519 prescription claims written by this provider, covering 107 Medicare beneficiaries and totaling roughly $510K in drug spend, split 20% brand-name and 80% generic by claim count.
Infectious Disease Physician is a mid-sized specialty nationwide, with 8,314 enrolled providers across 54 states and an average of 816 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 | 1245226323 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 09/23/2005 |
Hospital and facility affiliations
Facilities where Karen Denbesten, MD 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.
Mclaren Central Michigan
★★★☆☆ 3/5
Petoskey, MI
Acute Care Hospitals
CMS CCN: 230080
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Karen Denbesten, MD. Source: openpaymentsdata.cms.gov.
Total received
$19
Largest payer
ABBVIE INC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - Michigan MI-BOM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~41K Michigan medical licensees in 2023 - they are NOT specific to Karen Denbesten, MD. To verify Karen Denbesten, MD's current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Karen Denbesten, MD - brand share 20.0%
Infectious Disease Physician average
20% brand-name claims vs 80% generic, on 519 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
519
Total Claims
$510K
Total Drug Cost
107
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 571
- Total Day Supply
- 10,915
- Brand vs Generic
- 20% brand / 80% generic
- Brand Drug Cost
- $458K
- Generic Drug Cost
- $52K
- Antibiotic Claims
- 360
Patient Demographics
- Average Patient Age
- 69.8 years
- Avg HCC Risk Score
- 2.52
- Gender Split
- 44% female / 56% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Karen Denbesten, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ceftriaxone
Ceftriaxone
41 claims
- Sulfamethoxazole-T…
Sulfamethoxazole-Trimethoprim
37 claims
- Genvoya
Genvoya
36 claims
- Cephalexin
Cephalexin
35 claims
- Cefazolin Sodium
Cefazolin Sodium
32 claims
- Vancomycin Hcl
Vancomycin Hcl
29 claims
- Daptomycin
Daptomycin
26 claims
- Biktarvy
Biktarvy
25 claims
| Drug | Claims |
|---|---|
| Ceftriaxone Ceftriaxone Sodium | 41 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 37 |
| Genvoya Elviteg/Cob/Emtri/Tenof Alafen | 36 |
| Cephalexin | 35 |
| Cefazolin Sodium | 32 |
| Vancomycin Hcl | 29 |
| Daptomycin | 26 |
| Biktarvy Bictegrav/Emtricit/Tenofov Ala | 25 |
| Cefepime Hcl | 22 |
| Piperacillin-Tazobactam Piperacillin Sodium/Tazobactam | 21 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Infectious Disease Physician Overview
How Karen Denbesten, MD fits within the Infectious Disease Physician landscape nationally.
8,314
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
816
Avg Claims per Provider
Karen Denbesten, MD's 519 claims are below the specialty average of 816.
Nearby Infectious Disease Physician Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Denbesten.
Dr. Mujahed Abbas
M.D.
Lansing, MI
Dr. Rasha Abdalla
MD
Detroit, MI
Dr. Hend Abdul-Jauwad
MB, BCH, BAO
Plymouth, MI
Dr. Elfatih Abter
MD
Lapeer, MI
Dr. Fadi Abu Yasin
MD
Canton, MI
Compare Infectious Disease 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 Michigan medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Infectious Disease 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Michigan
Frequently Asked Questions
What is Karen Denbesten, MD's specialty? ▼
Karen Denbesten, MD specializes in Infectious Disease Physician and practices in Petoskey, Michigan. Credentials: MD.
How much does Karen Denbesten, MD prescribe under Medicare Part D? ▼
In 2023, Karen Denbesten, MD wrote 519 Medicare Part D claims totaling $510K in drug costs for 107 beneficiaries.
Where is Karen Denbesten, MD located? ▼
Karen Denbesten, MD is located at 560 W MITCHELL ST, Petoskey, MI, 49770. Phone: (231) 487-3590.
What is Karen Denbesten, MD's NPI number? ▼
Karen Denbesten, MD's National Provider Identifier (NPI) is 1245226323, issued on 09/23/2005.
Does Karen Denbesten, MD prescribe more brand-name or generic drugs? ▼
Karen Denbesten, MD's prescribing is 20% brand-name and 80% generic drugs by claim count, with $458K in brand drug costs.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,314 Infectious Disease Physician providers across 54 states in the US. The average Infectious Disease Physician provider writes 816 Medicare Part D claims per year.
What drugs does Karen Denbesten, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Karen Denbesten, MD's most frequently prescribed drugs include Ceftriaxone, Sulfamethoxazole-Trimethoprim, Genvoya. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karen Denbesten, MD accept Medicare? ▼
Karen Denbesten, MD appears in CMS Medicare data with 519 Part D claims and 107 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karen Denbesten, MD's credentials? ▼
Karen Denbesten, MD's NPI is 1245226323 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
Compiled from official public sources by the PlainDoctor editorial team.
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.