NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1003813965 M.D.
Verify on CMS → Dennis Kobylarz, M.D.
Family Medicine Physician in Canaan, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 147,760 in Family 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
7K
Medicare Part D claims · 398 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
90%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Dennis Kobylarz, M.D. filed 6,755 Medicare Part D claims in 2023 as a Family Medicine Physician in Canaan, Connecticut, prescribing 90% generic.
- 7K
- Part D claims, 2023
- 90%
- generic prescribing
- ≥96th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Dennis Kobylarz, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1003813965), first enumerated 07/06/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 6,755 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1003813965 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1003813965
- ENUM-LEGACY 2005
- TAX-MEGA 148K Family Medicine
- RX-MID 6,755
- BOOK-LIGHT 915 in Connecticut
- PHOTO-ENUM Tod Sweeney · 2005
Dennis Kobylarz, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
6,755 ≥ 96th percentile 96% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Dennis Kobylarz, M.D. 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 Dennis Kobylarz, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
6,755 98% vs specialty avg
Specialty distribution in Connecticut
How Family Medicine Physician compares to other specialties among Connecticut 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 Family 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).
Practice Address
Provider Details
| NPI | 1003813965 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/06/2005 |
Brand vs generic prescribing mix · Generic-heavy
Dennis Kobylarz, M.D. - brand share 9.0%
Family Medicine Physician average
9% brand-name claims vs 90% generic, on 6,755 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.
6,755
Total Claims
$488K
Total Drug Cost
398
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 12,086
- Total Day Supply
- 341,081
- Brand vs Generic
- 9% brand / 90% generic
- Brand Drug Cost
- $353K
- Generic Drug Cost
- $133K
- Opioid Claims
- 184 (2.7% rate)
- Antibiotic Claims
- 270
Patient Demographics
- Average Patient Age
- 77.5 years
- Avg HCC Risk Score
- 0.98
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 13, 65-74: 143, 75-84: 147, 85+: 95
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Dennis Kobylarz, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
396 claims
- Amlodipine Besylate
Amlodipine Besylate
238 claims
- Levothyroxine Sodium
Levothyroxine Sodium
203 claims
- Losartan Potassium
Losartan Potassium
195 claims
- Trazodone Hcl
Trazodone Hcl
186 claims
- Furosemide
Furosemide
185 claims
- Lisinopril
Lisinopril
185 claims
- Metoprolol Succinate 156
Metoprolol Succinate
156 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 396 |
| Amlodipine Besylate | 238 |
| Levothyroxine Sodium | 203 |
| Losartan Potassium | 195 |
| Trazodone Hcl | 186 |
| Furosemide | 185 |
| Lisinopril | 185 |
| Metoprolol Succinate | 156 |
| Rosuvastatin Calcium | 149 |
| Pantoprazole Sodium | 128 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Dennis Kobylarz, M.D. fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Dennis Kobylarz, M.D.'s 6,755 claims are above the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Kobylarz, both outside Connecticut so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Kobylarz.
One of 915 Family Medicine Physician providers enrolled in Connecticut, 5 are shown here.
Dr. Yadira Acevedo
MD
Portland, CT
Dr. Rodrigo Acosta
M.D.
Stamford, CT
Dr. Momina Afrede
DO
Vernon, CT
Dr. Alireza Afshar
MD
Newtown, CT
Dr. Manju Aggarwal
MD
Newington, CT
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Dennis Kobylarz, M.D.'s specialty? ▼
Dennis Kobylarz, M.D. specializes in Family Medicine Physician and practices in Canaan, Connecticut. Credentials: M.D..
How much does Dennis Kobylarz, M.D. prescribe under Medicare Part D? ▼
In 2023, Dennis Kobylarz, M.D. wrote 6,755 Medicare Part D claims totaling $488K in drug costs for 398 beneficiaries.
Where is Dennis Kobylarz, M.D. located? ▼
Dennis Kobylarz, M.D. is located at 10 GRANITE AVE., Canaan, CT, 06018. Phone: (860) 824-0753.
What is Dennis Kobylarz, M.D.'s NPI number? ▼
Dennis Kobylarz, M.D.'s National Provider Identifier (NPI) is 1003813965, issued on 07/06/2005.
Does Dennis Kobylarz, M.D. prescribe more brand-name or generic drugs? ▼
Dennis Kobylarz, M.D.'s prescribing is 9% brand-name and 90% generic drugs by claim count, with $353K in brand drug costs.
Does Dennis Kobylarz, M.D. prescribe opioids? ▼
Yes, Dennis Kobylarz, M.D. had 184 opioid claims in 2023 with an opioid prescribing rate of 2.7%.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Dennis Kobylarz, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Dennis Kobylarz, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Dennis Kobylarz, M.D. accept Medicare? ▼
Dennis Kobylarz, M.D. appears in CMS Medicare data with 6,755 Part D claims and 398 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Dennis Kobylarz, M.D.'s credentials? ▼
Dennis Kobylarz, M.D.'s NPI is 1003813965 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
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.