Dr. Gregory J. Mazanek, MD
- Medicare services, 2024
- 969
- Medicare patients, 2024
- 543
- Part D claims, 2024
- 2,935
- Hospital affiliations
- 5
- Industry payments
- $136
- Practice address
- 250 W 96th St, Indianapolis, IN 46260
- Practice phone
- Call (765) 584-0251
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ascension St Vincent Randolph Winchester Rehabilitation
Indianapolis, Indiana
Find Dr. Mazanek'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. Gregory J. Mazanek is a cardiologist in Indianapolis, Indiana
Dr. Mazanek practices at Ascension St Vincent Randolph Winchester Rehabilitation in Indianapolis, Indiana.
Dr. Mazanek's NPI, 1710955166, was assigned on March 10, 2006. Dr. Mazanek graduated from Jefferson Medical College of Thomas Jefferson University in 1983. Dr. Mazanek holds Indiana license 01060905A.
- NPI
- 1710955166NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385636075
- NPI enumeration date
- March 10, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (765) 584-0251
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory J. Mazanek practices at Ascension St Vincent Randolph Winchester Rehabilitation in Indianapolis, Indiana
Dr. Mazanek's primary practice is Ascension St Vincent Randolph Winchester Rehabilitation, at 250 W 96th St, Indianapolis, IN 46260 in Marion County. The practice phone is (765) 584-0251.
- Ascension St Vincent Randolph Winchester Rehabilitation250 W 96th St, Indianapolis, IN 46260 · Marion CountyPhone(765) 584-0251
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory J. Mazanek is affiliated with 8 sites of care and 2 medical groups
Dr. Mazanek's primary practice is Ascension St Vincent Randolph Winchester Rehabilitation in Indianapolis, Indiana. Dr. Mazanek is also affiliated with IU Health Methodist Hospital. The medical group on file is Ascension Medical Group St Vincent. Dmand AI also links Dr. Mazanek to 4 more hospitals, 2 group practices and clinics and 1 medical group, 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. Gregory J. Mazanek's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mazanek practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ascension St Vincent Randolph Winchester Rehabilitation | Available with a free account |
| +7 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory J. Mazanek is one of 414 cardiologists in Indiana
Cardiovascular disease is Dr. Mazanek's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Mazanek is licensed in Indiana.
Specialties and state licenses
- Cardiovascular disease, IndianaPrimary
Cardiologists near Dr. Mazanek
Counts of cardiologists 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. Gregory J. Mazanek billed Medicare for 969 services in 2024
CMS data shows 969 Medicare services from Dr. Mazanek across 6 procedure codes in 2024, for 543 Medicare patients. Medicare paid $35,349 for them.
Dr. Mazanek's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5152024: 5101%
- Tests and treatments
- 2023: 4362024: 4595%
Where Dr. Mazanek's Medicare services took place, 2024
- In an office71173%
- In a facility25827%
Dr. Mazanek compared with the Indiana median for cardiologists, 2024
- Dr. Mazanek
- Indiana median
- Medicare services
- 969vs 1,96651% below
- Medicare patients
- 543vs 99245% below
- Part D claims
- 2,739vs 3,33818% below
Medians across 406 cardiologists in Indiana with Dmand AI profiles that report each measure.
Dr. Mazanek'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mazanek and other cardiologists in Indiana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory J. Mazanek treated 543 Medicare patients in 2024, average age 76
CMS counts 543 Medicare patients who saw Dr. Mazanek in 2024. The largest group is 75 to 84, with 220 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 8% are also on Medicaid. Their average risk score is 1.48, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Mazanek's median patient age at 76, with 43% women.
Dr. Mazanek's Medicare patients by age, 2024
Dr. Mazanek's Medicare patients by sex, 2024
- Women25547%
- Men28853%
Chronic conditions among Dr. Mazanek's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease60%
- Arthritis50%
- Atrial fibrillation39%
- Diabetes37%
- Heart failure31%
- Chronic kidney disease30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mazanek's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women43%
- Men57%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory J. Mazanek wrote 2,935 Medicare Part D claims in 2024
In 2024, Dr. Mazanek wrote 2,935 Medicare Part D claims for 399 patients. 85% of them were for generic drugs. CMS names the drug for 2,739 of them, across 36 drugs with 11 or more claims each, at $535,142 in total drug cost. In 2023, CMS named 2,705 claims across 37 drugs.
Dr. Mazanek's Part D claims by kind of drug, 2024
- Generic2,498 claims85%
- Brand-name437 claims15%
Dr. Mazanek's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,7052024: 2,7391%
Drugs named by CMS: 36 in 2024, 37 in 2023.
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
How Dr. Gregory J. Mazanek takes part in Medicare
Dr. Mazanek accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Gregory J. Mazanek received $136 in industry payments from 2016 to 2025
CMS Open Payments shows 6 general payments to Dr. Mazanek from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $43.
General payments to Dr. Mazanek by program year, 2016 to 2025
Companies that paid Dr. Mazanek 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. Gregory J. Mazanek graduated from Jefferson Medical College of Thomas Jefferson University
Dr. Mazanek graduated from Jefferson Medical College of Thomas Jefferson University in 1983.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory J. Mazanek'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) |
| 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. Gregory J. Mazanek
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. Gregory J. Mazanek's NPI number?
Dr. Gregory J. Mazanek's NPI number is 1710955166. It was assigned on March 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory J. Mazanek?
Dr. Gregory J. Mazanek is a cardiologist in Indianapolis, Indiana. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. Gregory J. Mazanek practice?
Dr. Mazanek practices at 250 W 96th St, Indianapolis, IN 46260. Dr. Mazanek's primary practice is Ascension St Vincent Randolph Winchester Rehabilitation in Indianapolis, Indiana. Dmand AI also links Dr. Mazanek to 4 hospitals, 2 group practices and clinics and 1 medical group.
What is Dr. Gregory J. Mazanek's office phone number?
The practice phone on file for Dr. Mazanek is (765) 584-0251.
What is Dr. Gregory J. Mazanek's medical license number?
Dr. Mazanek holds Indiana license 01060905A.
Which hospitals is Dr. Gregory J. Mazanek affiliated with?
Dr. Mazanek is affiliated with IU Health Methodist Hospital. Dmand AI links Dr. Mazanek to 4 more hospitals.
What medical group is Dr. Gregory J. Mazanek part of?
Dr. Mazanek is linked to Ascension Medical Group St Vincent. Dmand AI links Dr. Mazanek to 1 more medical group.
Does Dr. Gregory J. Mazanek accept Medicare?
Yes. CMS data shows Dr. Mazanek billed Medicare for 969 services in 2024, and Dr. Mazanek accepts Medicare assignment.
How many Medicare patients does Dr. Gregory J. Mazanek see?
CMS counts 543 Medicare patients who saw Dr. Mazanek in 2024, with an average age of 76.
What services does Dr. Gregory J. Mazanek bill to Medicare?
In 2024, Dr. Mazanek's most billed Medicare services were heart test or procedure (93010), office visit, established patient (99214) and office visit, established patient (99213).
Show 4 more questionsShow fewer questions
Where did Dr. Gregory J. Mazanek go to medical school?
Dr. Mazanek graduated from Jefferson Medical College of Thomas Jefferson University in 1983.
What drugs does Dr. Gregory J. Mazanek prescribe most?
In 2024 Medicare Part D data, Dr. Mazanek's most prescribed drugs by claims were Metoprolol Succinate, Eliquis and Amlodipine Besylate.
Has Dr. Gregory J. Mazanek received payments from drug or device companies?
CMS Open Payments shows $136 in general payments to Dr. Mazanek from 5 companies from 2016 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. Gregory J. Mazanek been practicing?
Dr. Mazanek graduated from medical school in 1983, 43 years ago.
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