Dr. Mark J. Hornyak, MD
- Medicare services, 2024
- 122
- Medicare patients, 2024
- 110
- Part D claims, 2024
- 48
- MIPS score, 2024
- 90
- Hospital affiliations
- 2
- Practice address
- 1 Park St, Norwich, CT 06360
- Practice phone
- Call (860) 246-2071
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Hartford Healthcare Medical Group Specialists
Norwich, Connecticut
Find Dr. Hornyak'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. Mark J. Hornyak is a neurosurgeon in Norwich, Connecticut
Dr. Hornyak practices at Hartford Healthcare Medical Group Specialists in Norwich, Connecticut.
Dr. Hornyak's NPI, 1124226394, was assigned on July 10, 2007. Dr. Hornyak graduated from University of Maryland School of Medicine in 2000. Dr. Hornyak holds Connecticut license 62295.
- NPI
- 1124226394NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8527150390
- NPI enumeration date
- July 10, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (860) 246-2071
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark J. Hornyak practices at Hartford Healthcare Medical Group Specialists in Norwich, Connecticut
Dr. Hornyak's primary practice is Hartford Healthcare Medical Group Specialists, at 1 Park St, Norwich, CT 06360 in Southeastern Ct County. The practice phone is (860) 246-2071.
- Hartford Healthcare Medical Group Specialists1 Park St, Norwich, CT 06360 · Southeastern Ct CountyPhone(860) 246-2071
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark J. Hornyak is affiliated with 5 sites of care and 3 medical groups
Dr. Hornyak's primary practice is Hartford Healthcare Medical Group Specialists in Norwich, Connecticut. Dr. Hornyak is also affiliated with Backus Hospital. The medical group on file is Hartford HealthCare Medical Group Specialists. Dmand AI also links Dr. Hornyak to 1 more hospital, 2 medical groups, 1 group practice or clinic and 1 home health agency, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mark J. Hornyak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hornyak practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hartford Healthcare Medical Group Specialists | Available with a free account |
| +4 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark J. Hornyak is one of 99 neurosurgeons in Connecticut
Neurological surgery is Dr. Hornyak's primary specialty in the NPI Registry, under taxonomy code 207T00000X. Dr. Hornyak is board certified in neurological surgery by the American Board of Neurological Surgery. Dmand AI has Dr. Hornyak's licenses on file in 2 states: Connecticut and Michigan.
Specialties and state licenses
- Neurological surgery, ConnecticutPrimary
- Michigan license
Neurosurgeons near Dr. Hornyak
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. Mark J. Hornyak billed Medicare for 122 services in 2024
CMS data shows 122 Medicare services from Dr. Hornyak across 3 procedure codes in 2024, for 110 Medicare patients. Medicare paid $13,460 for them.
Dr. Hornyak's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1202024: 1222%
Where Dr. Hornyak's Medicare services took place, 2024
- In an office10889%
- In a facility1411%
Dr. Hornyak compared with the Connecticut median for neurosurgeons, 2024
- Dr. Hornyak
- Connecticut median
- Medicare services
- 122vs 14113% below
- Medicare patients
- 110vs 105Close to median
- Part D claims
- 15vs 3050% below
Medians across 83 neurosurgeons in Connecticut with Dmand AI profiles that report each measure.
Dr. Hornyak's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark J. Hornyak treated 110 Medicare patients in 2024, average age 73
CMS counts 110 Medicare patients who saw Dr. Hornyak in 2024. The largest group is 65 to 74, with 47 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 27% are also on Medicaid. Their average risk score is 1.36, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Hornyak's median patient age at 63, with 52% women.
Dr. Hornyak's Medicare patients by age, 2024
Dr. Hornyak's Medicare patients by sex, 2024
- Women5853%
- Men5247%
Chronic conditions among Dr. Hornyak's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis69%
- Anxiety41%
- Mood disorders41%
- Depression38%
- Diabetes30%
- Ischemic heart disease30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hornyak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women52%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark J. Hornyak wrote 48 Medicare Part D claims in 2024
In 2024, Dr. Hornyak wrote 48 Medicare Part D claims for 32 patients. 100% of them were for generic drugs. CMS names the drug for 15 of them, across 1 drug with 11 or more claims each, at $156 in total drug cost. In 2022, CMS named 55 claims across 3 drugs.
Dr. Hornyak's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Hornyak's Part D claims, 2024
- Opioids38%18 of 48 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 552023: 1573%
Drugs named by CMS: 1 in 2023, 3 in 2022.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Mark J. Hornyak scored 90 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 90 out of 100 for Dr. Hornyak for performance year 2024, reported as part of a group. Dr. Hornyak accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Hornyak as offering telehealth. CMS counts 28 procedures of spinal fusion by Dr. Hornyak, more than 43% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Hornyak's MIPS scores, performance year 2024
- 90of 100Final score
- 83.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Hornyak ranks in Medicare procedure volume
- Spinal fusion
- 43rd percentile28 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Laminectomy or laminotomy (partial removal of spine bones): 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Mark J. Hornyak received $14,495 in industry payments from 2016 to 2025
CMS Open Payments shows 269 general payments to Dr. Hornyak from 64 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 69% of the total. Medtronic USA, Inc. paid the most, $3,860.
General payments to Dr. Hornyak by program year, 2016 to 2025
General payments to Dr. Hornyak by kind, 2016 to 2025
- Food and beverage$10,06069%
- Travel and lodging$2,93520%
- Honoraria$1,50010%
Companies that paid Dr. Hornyak the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark J. Hornyak graduated from University of Maryland School of Medicine
Dr. Hornyak graduated from University of Maryland School of Medicine in 2000.
- Medical school
- Board certified in neurological surgery
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark J. Hornyak'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 Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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. Mark J. Hornyak
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. Mark J. Hornyak's NPI number?
Dr. Mark J. Hornyak's NPI number is 1124226394. It was assigned on July 10, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark J. Hornyak?
Dr. Mark J. Hornyak is a neurosurgeon in Norwich, Connecticut. The primary specialty in the NPI Registry is Neurological Surgery Physician (taxonomy code 207T00000X).
Where does Dr. Mark J. Hornyak practice?
Dr. Hornyak practices at 1 Park St, Norwich, CT 06360. Dr. Hornyak's primary practice is Hartford Healthcare Medical Group Specialists in Norwich, Connecticut. Dmand AI also links Dr. Hornyak to 1 hospital, 2 medical groups, 1 group practice or clinic and 1 home health agency.
What is Dr. Mark J. Hornyak's office phone number?
The practice phone on file for Dr. Hornyak is (860) 246-2071.
What is Dr. Mark J. Hornyak's medical license number?
Dr. Hornyak holds Connecticut license 62295, one of the licenses on file in 2 states.
Which states has Dr. Mark J. Hornyak been licensed in?
Dmand AI has state licenses on file for Dr. Hornyak in Connecticut and Michigan.
Which hospitals is Dr. Mark J. Hornyak affiliated with?
Dr. Hornyak is affiliated with Backus Hospital. Dmand AI links Dr. Hornyak to 1 more hospital.
What medical group is Dr. Mark J. Hornyak part of?
Dr. Hornyak is linked to Hartford HealthCare Medical Group Specialists. Dmand AI links Dr. Hornyak to 2 more medical groups.
Does Dr. Mark J. Hornyak accept Medicare?
Yes. CMS data shows Dr. Hornyak billed Medicare for 122 services in 2024, and Dr. Hornyak accepts Medicare assignment.
Does Dr. Mark J. Hornyak offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Hornyak as offering telehealth services.
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What is Dr. Mark J. Hornyak's MIPS score?
Dr. Hornyak's MIPS final score for performance year 2024 is 90 out of 100, reported as part of a group.
How many Medicare patients does Dr. Mark J. Hornyak see?
CMS counts 110 Medicare patients who saw Dr. Hornyak in 2024, with an average age of 73.
Is Dr. Mark J. Hornyak board certified?
Yes. Dr. Hornyak is board certified in neurological surgery by the American Board of Neurological Surgery.
What services does Dr. Mark J. Hornyak bill to Medicare?
In 2024, Dr. Hornyak's most billed Medicare services were office visit, established patient (99214), office visit, new patient (99204) and hospital inpatient care (99222).
Where did Dr. Mark J. Hornyak go to medical school?
Dr. Hornyak graduated from University of Maryland School of Medicine in 2000.
What drugs does Dr. Mark J. Hornyak prescribe most?
In 2023 Medicare Part D data, Dr. Hornyak's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Mark J. Hornyak received payments from drug or device companies?
CMS Open Payments shows $14,495 in general payments to Dr. Hornyak from 64 companies from 2016 to 2025. The largest total came from Medtronic USA, Inc.
How long has Dr. Mark J. Hornyak been practicing?
Dr. Hornyak graduated from medical school in 2000, 26 years ago.
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