A Study of Tirzepatide (LY3298176) on the Reduction on Morbidity and Mortality in Adults With Obesity (opens in a new tab)
Active, not recruiting
$3,634 in research paymentsObesityOvernutritionTirzepatide
Dr. Gregory Merrill Koshkarian, MD
NPI1164425096PAC ID2567351349
- Medicare services, 2024
- 11,916
- Medicare patients, 2024
- 1,362
- Part D claims, 2024
- 10,380
- Clinical trials
- 1
- MIPS score, 2024
- 90
- Practice address
- 3709 N Campbell Ave, Tucson, AZ 85719
- Practice phone
- Call (520) 838-3540
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Pima Heart & Vascular
Multi-specialty group site · Tucson, Arizona
Find Dr. Koshkarian'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 Merrill Koshkarian is a cardiologist in Tucson, Arizona
Dr. Koshkarian practices at Pima Heart & Vascular in Tucson, Arizona.
Dr. Koshkarian's NPI, 1164425096, was assigned on May 24, 2005. Dr. Koshkarian graduated from Yale University School of Medicine in 1989. Dr. Koshkarian holds Arizona license 24327.
NPI and contact details
- NPI
- 1164425096NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2567351349
- NPI enumeration date
- May 24, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (520) 838-3540
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory Merrill Koshkarian practices at Pima Heart & Vascular in Tucson, Arizona
Dr. Koshkarian's primary practice is Pima Heart & Vascular, at 3709 N Campbell Ave, Tucson, AZ 85719. The practice phone is (520) 838-3540.
- Pima Heart & Vascular3709 N Campbell Ave, Tucson, AZ 85719Phone(520) 838-3540
Source: Dmand AI Affiliation Data
Dr. Gregory Merrill Koshkarian is affiliated with 7 sites of care and 3 medical groups
Dr. Koshkarian's primary practice is Pima Heart & Vascular in Tucson, Arizona. Dr. Koshkarian is also affiliated with Tucson Medical Center. The medical group on file is Pima Heart & Vascular. Dmand AI also links Dr. Koshkarian to 3 more hospitals, 2 group practices and clinics and 2 medical groups, each named with a free account.
Pima Heart & VascularPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory Merrill Koshkarian's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Koshkarian practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Pima Heart & Vascular | Available with a free account |
| +6 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Gregory Merrill Koshkarian is one of 423 cardiologists in Arizona
Cardiovascular disease is Dr. Koshkarian's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Koshkarian is licensed in Arizona.
Specialties and state licenses
- Cardiovascular disease, ArizonaPrimary
Cardiologists near Dr. Koshkarian
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 Merrill Koshkarian billed Medicare for 11,916 services in 2024
CMS data shows 11,916 Medicare services from Dr. Koshkarian across 32 procedure codes in 2024, for 1,362 Medicare patients. Medicare paid $425,842 for them.
Medicare services, 202411,916
Medicare patients1,362
Paid by Medicare$425,842
Procedure codes32
Dr. Koshkarian's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 6,4602024: 5,9628%
- Office and hospital visits
- 2023: 3,0472024: 3,1895%
- Tests and treatments
- 2023: 2,6382024: 2,6942%
- Imaging
- 2023: 982024: 7128%
Where Dr. Koshkarian's Medicare services took place, 2024
- In an office11,70798%
- In a facility2092%
Dr. Koshkarian compared with the Arizona median for cardiologists, 2024
- Dr. Koshkarian
- Arizona median
- Medicare services
- 11,916vs 2,3575.1 times
- Medicare patients
- 1,362vs 86358% above
- Part D claims
- 10,098vs 1,3627.4 times
Medians across 403 cardiologists in Arizona with Dmand AI profiles that report each measure.
Dr. Koshkarian'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. Gregory Merrill Koshkarian treated 1,362 Medicare patients in 2024, average age 77
CMS counts 1,362 Medicare patients who saw Dr. Koshkarian in 2024. The largest group is 75 to 84, with 624 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 1% are also on Medicaid. Their average risk score is 1.28, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Koshkarian's median patient age at 74, with 49% women.
Medicare patients, 20241,362
Average age77
Average risk score1.28
Also on Medicaid1%
Dr. Koshkarian's Medicare patients by age, 2024
Dr. Koshkarian's Medicare patients by sex, 2024
- Women63246%
- Men73054%
Chronic conditions among Dr. Koshkarian's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis46%
- Ischemic heart disease43%
- Atrial fibrillation33%
- Chronic kidney disease31%
- Heart failure24%
- Diabetes23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Koshkarian's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory Merrill Koshkarian wrote 10,380 Medicare Part D claims in 2024
In 2024, Dr. Koshkarian wrote 10,380 Medicare Part D claims for 1,441 patients. 78% of them were for generic drugs. CMS names the drug for 10,098 of them, across 65 drugs with 11 or more claims each, at $2,935,039 in total drug cost. In 2023, CMS named 8,316 claims across 61 drugs.
Part D claims, 202410,380
Drugs named by CMS65
Total drug cost$2.9M
Part D patients1,441
Dr. Koshkarian's Part D claims by kind of drug, 2024
- Generic8,121 claims78%
- Brand-name2,259 claims22%
Dr. Koshkarian'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.
Drug classes CMS tracks in Dr. Koshkarian's Part D claims, 2024
- Antibiotics0%11 of 10,380 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, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8,3162024: 10,09821%
Drugs named by CMS: 65 in 2024, 61 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
Dr. Gregory Merrill Koshkarian 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. Koshkarian for performance year 2024, reported as part of a group. Dr. Koshkarian accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Koshkarian as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Koshkarian's MIPS scores, performance year 2024
- 90of 100Final score
- 83.8of 100Quality
- 97of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Gregory Merrill Koshkarian has worked on 1 clinical trial
Dmand AI links Dr. Koshkarian to 1 clinical trial. 1 is still active or recruiting. Conditions studied include Obesity and Overnutrition. Open Payments lists research payments to Dr. Koshkarian that name 1 trial.
Conditions in Dr. Koshkarian's trials
- Obesity
- Overnutrition
Investigators on the most trials with Dr. Koshkarian
Recent clinical trials with Dr. Koshkarian
Sources: Open Payments (CMS), 2025 data, released July 7, 2026; ClinicalTrials.gov (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gregory Merrill Koshkarian received $19,031 in industry payments from 2016 to 2025
CMS Open Payments shows 909 general payments to Dr. Koshkarian from 58 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 97% of the total. Novartis Pharmaceuticals Corporation paid the most, $2,382. It also lists 3 research payments totaling $3,634 from 2022 to 2024, naming 1 clinical trial.
General payments to Dr. Koshkarian by program year, 2016 to 2025
General payments to Dr. Koshkarian by kind, 2016 to 2025
$19Kin total
- Food and beverage$18,46297%
- Travel and lodging$5403%
- Education$290%
Companies that paid Dr. Koshkarian 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 Merrill Koshkarian graduated from Yale University School of Medicine
Dr. Koshkarian graduated from Yale University School of Medicine in 1989.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory Merrill Koshkarian'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand 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) |
| Clinical trials and co-investigators | ClinicalTrials.gov (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 Merrill Koshkarian
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 Merrill Koshkarian's NPI number?
Dr. Gregory Merrill Koshkarian's NPI number is 1164425096. It was assigned on May 24, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Merrill Koshkarian?
Dr. Gregory Merrill Koshkarian is a cardiologist in Tucson, Arizona. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. Gregory Merrill Koshkarian practice?
Dr. Koshkarian practices at 3709 N Campbell Ave, Tucson, AZ 85719. Dr. Koshkarian's primary practice is Pima Heart & Vascular in Tucson, Arizona. Dmand AI also links Dr. Koshkarian to 3 hospitals, 2 group practices and clinics and 2 medical groups.
What is Dr. Gregory Merrill Koshkarian's office phone number?
The practice phone on file for Dr. Koshkarian is (520) 838-3540.
What is Dr. Gregory Merrill Koshkarian's medical license number?
Dr. Koshkarian holds Arizona license 24327.
Which hospitals is Dr. Gregory Merrill Koshkarian affiliated with?
Dr. Koshkarian is affiliated with Tucson Medical Center. Dmand AI links Dr. Koshkarian to 3 more hospitals.
What medical group is Dr. Gregory Merrill Koshkarian part of?
Dr. Koshkarian is linked to Pima Heart & Vascular. Dmand AI links Dr. Koshkarian to 2 more medical groups.
Does Dr. Gregory Merrill Koshkarian accept Medicare?
Yes. CMS data shows Dr. Koshkarian billed Medicare for 11,916 services in 2024, and Dr. Koshkarian accepts Medicare assignment.
Does Dr. Gregory Merrill Koshkarian offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Koshkarian as offering telehealth services.
What is Dr. Gregory Merrill Koshkarian's MIPS score?
Dr. Koshkarian's MIPS final score for performance year 2024 is 90 out of 100, reported as part of a group.
Show 7 more questionsShow fewer questions
How many Medicare patients does Dr. Gregory Merrill Koshkarian see?
CMS counts 1,362 Medicare patients who saw Dr. Koshkarian in 2024, with an average age of 77.
What services does Dr. Gregory Merrill Koshkarian bill to Medicare?
In 2024, Dr. Koshkarian's most billed Medicare services were medicare temporary code (Q9967), office visit, established patient (99214) and heart test or procedure (93000).
Where did Dr. Gregory Merrill Koshkarian go to medical school?
Dr. Koshkarian graduated from Yale University School of Medicine in 1989.
What drugs does Dr. Gregory Merrill Koshkarian prescribe most?
In 2024 Medicare Part D data, Dr. Koshkarian's most prescribed drugs by claims were Metoprolol Succinate, Eliquis and Amlodipine Besylate.
Has Dr. Gregory Merrill Koshkarian received payments from drug or device companies?
CMS Open Payments shows $19,031 in general payments to Dr. Koshkarian from 58 companies from 2016 to 2025. The largest total came from Novartis Pharmaceuticals Corporation.
How long has Dr. Gregory Merrill Koshkarian been practicing?
Dr. Koshkarian graduated from medical school in 1989, 37 years ago.
Does Dr. Gregory Merrill Koshkarian do research?
Dr. Koshkarian has worked on 1 clinical trial.
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