Dr. Michael E. Karnasiewicz, MD
- Medicare services, 2020
- 19
- Industry payments
- $1,207
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 500 Chase Pkwy, Waterbury, CT 06708-3346
- Practice phone
- Call (203) 755-6677
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Neurosurgery Orthopaedics & Spine Specialists
Multi-specialty group site · Waterbury, Connecticut
Find Dr. Karnasiewicz'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. Michael E. Karnasiewicz is a neurosurgeon in New Haven, Connecticut
Dr. Karnasiewicz practices at Neurosurgery Orthopaedics & Spine Specialists in Waterbury, Connecticut.
Dr. Karnasiewicz's NPI, 1861459182, was assigned on April 28, 2006. Dr. Karnasiewicz holds Connecticut license 017466.
- NPI
- 1861459182NPI Registry (opens in a new tab)
- NPI enumeration date
- April 28, 2006
- NPI status
- Active
- Practice phone
- (203) 755-6677
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael E. Karnasiewicz practices in Waterbury and New Haven
Dr. Karnasiewicz's primary practice is Neurosurgery Orthopaedics & Spine Specialists, at 500 Chase Pkwy, Waterbury, CT 06708-3346. The practice phone is (203) 755-6677. The NPI Registry lists Dr. Karnasiewicz's practice address as 20 York St, New Haven, CT 06510.
- Neurosurgery Orthopaedics & Spine SpecialistsPrimary500 Chase Pkwy, Waterbury, CT 06708-3346Phone(203) 755-6677
- NPI Registry address20 York St, New Haven, CT 06510 · South Central Ct CountyPhone(203) 755-6677
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Michael E. Karnasiewicz is affiliated with 1 site of care and 1 medical group
Dr. Karnasiewicz's primary practice is Neurosurgery Orthopaedics & Spine Specialists in Waterbury, Connecticut. The medical group on file is Neurosurgery, Orthopaedics and Spine Specialists (NOSS).
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Michael E. Karnasiewicz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Karnasiewicz practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Neurosurgery Orthopaedics & Spine Specialists | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael E. Karnasiewicz is one of 99 neurosurgeons in Connecticut
Neurological surgery is Dr. Karnasiewicz's primary specialty in the NPI Registry, under taxonomy code 207T00000X. Dr. Karnasiewicz is licensed in Connecticut.
Specialties and state licenses
- Neurological surgery, ConnecticutPrimary
Neurosurgeons near Dr. Karnasiewicz
Counts of neurosurgeons 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. Michael E. Karnasiewicz billed Medicare for 19 services in 2020
CMS data shows 19 Medicare services from Dr. Karnasiewicz across 1 procedure code in 2020, all of them office visits. Medicare paid $1,472 for them. Every service was in an office.
Dr. Karnasiewicz's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 312020: 1939%
Dr. Karnasiewicz compared with the Connecticut median for neurosurgeons, 2020
- Dr. Karnasiewicz
- Connecticut median
- Medicare services
- 19vs 14187% below
Medians across 83 neurosurgeons in Connecticut with Dmand AI profiles that report each measure.
Dr. Karnasiewicz's most billed Medicare procedure codes, 2020
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Karnasiewicz?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Karnasiewicz and other neurosurgeons in Connecticut.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael E. Karnasiewicz's patients have a median age of 61
Across all payers, Dmand AI patient panel data puts Dr. Karnasiewicz's median patient age at 61.
Dr. Karnasiewicz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Source: Dmand AI Patient Panel Data
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Dr. Michael E. Karnasiewicz received $1,207 in industry payments from 2016 to 2025
CMS Open Payments shows 19 general payments to Dr. Karnasiewicz from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $1,003.
General payments to Dr. Karnasiewicz by program year, 2016 to 2025
Companies that paid Dr. Karnasiewicz the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Michael E. Karnasiewicz'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 Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Michael E. Karnasiewicz
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. Michael E. Karnasiewicz's NPI number?
Dr. Michael E. Karnasiewicz's NPI number is 1861459182. It was assigned on April 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael E. Karnasiewicz?
Dr. Michael E. Karnasiewicz is a neurosurgeon in New Haven, Connecticut. The primary specialty in the NPI Registry is Neurological Surgery Physician (taxonomy code 207T00000X).
Where does Dr. Michael E. Karnasiewicz practice?
Dr. Karnasiewicz practices at 500 Chase Pkwy, Waterbury, CT 06708-3346. Dr. Karnasiewicz also practices at 20 York St, New Haven, CT 06510. Dr. Karnasiewicz's primary practice is Neurosurgery Orthopaedics & Spine Specialists in Waterbury, Connecticut.
What is Dr. Michael E. Karnasiewicz's office phone number?
The practice phone on file for Dr. Karnasiewicz is (203) 755-6677.
What is Dr. Michael E. Karnasiewicz's medical license number?
Dr. Karnasiewicz holds Connecticut license 017466.
What medical group is Dr. Michael E. Karnasiewicz part of?
Dr. Karnasiewicz is linked to Neurosurgery, Orthopaedics and Spine Specialists (NOSS).
Does Dr. Michael E. Karnasiewicz accept Medicare?
Yes. CMS data shows Dr. Karnasiewicz billed Medicare for 19 services in 2020.
What services does Dr. Michael E. Karnasiewicz bill to Medicare?
In 2020, Dr. Karnasiewicz's most billed Medicare services were office visit, established patient (99214).
Has Dr. Michael E. Karnasiewicz received payments from drug or device companies?
CMS Open Payments shows $1,207 in general payments to Dr. Karnasiewicz from 5 companies from 2016 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Michael E. Karnasiewicz been practicing?
Dr. Karnasiewicz's NPI was assigned in 2006.
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