Gregory Merrill Koshkarian, MD
Cardiovascular Disease Physician · Tucson, AZ
Gregory Merrill Koshkarian, MD is a cardiovascular disease physician with a practice address in Tucson, Arizona, and NPI 1164425096, issued on May 24, 2005. Check the license (Arizona 24327, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Merrill Koshkarian
- Credential
- MD
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- 24327 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 6080 N LA Cholla Blvd # 200, Tucson, AZ 85741
- Phone
- (520) 797-8550
- Enumerated
- May 24, 2005
- Record last updated
- Jan 29, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (520) 797-6986
- Medicaid IDs
- 351057 AZ
XPY196923 CA
1172298 00 WY - Medicare enrollment
- Enrolled (PECOS I20040617001561); accepts Medicare assignment
- Medical or professional school
- Yale University School Of Medicine, 1989
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 6080 N LA Cholla Blvd # 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elizabeth Attig, MDCardiovascular Disease Physician1548263783
- Jason Stemmer, MDNuclear Cardiology Physician1366445280
Verify Gregory Merrill Koshkarian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 24327Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average cardiovascular disease physician in 2024
10,380 Medicare Part D claims for 1,441 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Metoprolol Succinate1,020 claims
- Eliquis742 claims
- Amlodipine Besylate738 claims
- Rosuvastatin Calcium676 claims
- Atorvastatin Calcium565 claims
- Spironolactone523 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 79.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,407.34
106 payments; by number, the most common kind was food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 16,686 providers of this specialty with any payment received $3,819.56 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Pima Heart Physicians PCTucson, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cardiovascular Disease Physician providers in Arizona
There are 488 cardiovascular disease physician records in Arizona.
Other cardiovascular disease physician records in Arizona
- Mahmoud Abdelnabi, MDScottsdale, AZ1548934714
- Kanaan Abow Alkhier, MD, RPVI, RCS, RVSLake Havasu City, AZ1235842808
- Anas Abudan, MDYuma, AZ1265937809
- Tushar Acharya, M.D.Tucson, AZ1922313774
- Afroze Ahmad, MDMesa, AZ1164484440
- Mohamed Ahmed, M.D.Bullhead City, AZ1598776270
- M. Jamil Akhtar, M.D.Tempe, AZ1013981067
- Zaher Akkad, M.D.Phoenix, AZ1952308454
- Muhanad Al-Zubaidi, MDChandler, AZ1952627622
- Khaled Albasha, M.D.Gilbert, AZ1932147477
Common questions
What is Gregory Merrill Koshkarian, MD's NPI number?
Gregory Merrill Koshkarian, MD's National Provider Identifier (NPI) is 1164425096, issued on May 24, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Merrill Koshkarian, MD located?
The NPPES record lists a practice address at 6080 N LA Cholla Blvd # 200, Tucson, AZ, 85741. Phone: (520) 797-8550. Providers update this record themselves, so call before visiting.
How can I verify Gregory Merrill Koshkarian, MD's license?
NPPES lists Arizona license number 24327, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory Merrill Koshkarian, MD prescribe under Medicare Part D?
In 2024, Gregory Merrill Koshkarian, MD had 10,380 Medicare Part D claims for 1,441 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
What is Gregory Merrill Koshkarian, MD's MIPS final score?
The 2023 MIPS final score is 79.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.