Academic Medical CentersFamily PracticeInternal Medicine
Dr. Mario Marquist Ray, MD
NPI1326128364PAC ID8123129855
- Medicare services, 2024
- 606
- Medicare patients, 2024
- 121
- Part D claims, 2024
- 403
- Publications
- 3
- MIPS score, 2024
- 81
- Practice address
- 877 Jefferson Avenue, Memphis, TN 38103
- Practice phone
- Call (901) 545-7928
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Mario Marquist Ray is a hospitalist in Memphis, Tennessee
Dr. Ray practices at Regional Medical Center in Memphis, Tennessee, part of Shelby County Government.
Dr. Ray's NPI, 1326128364, was assigned on October 16, 2006. Dr. Ray graduated from University of Tennessee, Hsc, College of Medicine in 2003. Dr. Ray holds Tennessee license 39663.
NPI and contact details
- NPI
- 1326128364NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8123129855
- NPI enumeration date
- October 16, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (901) 545-7928
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mario Marquist Ray practices at Regional Medical Center in Memphis, Tennessee
Dr. Ray's primary practice is Regional Medical Center, at 877 Jefferson Avenue, Memphis, TN 38103 in Shelby County. The practice phone is (901) 545-7928.
- Regional Medical Center877 Jefferson Avenue, Memphis, TN 38103 · Shelby CountyPhone(901) 545-7928
Source: Dmand AI Affiliation Data
Dr. Mario Marquist Ray is affiliated with 2 sites of care and 1 medical group
Dr. Ray's primary practice is Regional Medical Center in Memphis, Tennessee, part of Shelby County Government. The medical group on file is UT Regional One Physicians. Dmand AI also links Dr. Ray to 1 more hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mario Marquist Ray's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ray practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Regional Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mario Marquist Ray is one of 425 hospitalists in Tennessee
Hospitalist is Dr. Ray's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Ray is licensed in Tennessee.
Specialties and state licenses
- Hospitalist, TennesseePrimary
Hospitalists near Dr. Ray
Counts of hospitalists 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. Mario Marquist Ray billed Medicare for 606 services in 2024
CMS data shows 606 Medicare services from Dr. Ray across 6 procedure codes in 2024, for 121 Medicare patients. Medicare paid $39,171 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2024606
Medicare patients121
Paid by Medicare$39,171
Procedure codes6
Dr. Ray's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4852024: 60625%
Dr. Ray compared with the Tennessee median for hospitalists, 2024
- Dr. Ray
- Tennessee median
- Medicare services
- 606vs 53413% above
- Medicare patients
- 121vs 19538% below
- Part D claims
- 186vs 10577% above
Medians across 385 hospitalists in Tennessee with Dmand AI profiles that report each measure.
Dr. Ray'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. Mario Marquist Ray treated 121 Medicare patients in 2024, average age 73
CMS counts 121 Medicare patients who saw Dr. Ray in 2024. The largest group is 75 to 84, with 50 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 24% are also on Medicaid. Their average risk score is 1.71, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Ray's median patient age at 59, with 43% women.
Medicare patients, 2024121
Average age73
Average risk score1.71
Also on Medicaid24%
Dr. Ray's Medicare patients by age, 2024
Dr. Ray's Medicare patients by sex, 2024
- Women7965%
- Men4235%
Chronic conditions among Dr. Ray's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis66%
- Mood disorders46%
- Diabetes45%
- Ischemic heart disease42%
- Depression41%
- Chronic kidney disease34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ray's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
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. Mario Marquist Ray wrote 403 Medicare Part D claims in 2024
In 2024, Dr. Ray wrote 403 Medicare Part D claims for 95 patients. 88% of them were for generic drugs. CMS names the drug for 186 of them, across 9 drugs with 11 or more claims each, at $8,913 in total drug cost. In 2023, CMS named 23 claims across 1 drug.
Part D claims, 2024403
Drugs named by CMS9
Total drug cost$8,913
Part D patients95
Dr. Ray's Part D claims by kind of drug, 2024
- Generic355 claims88%
- Brand-name48 claims12%
Dr. Ray'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. Ray's Part D claims, 2024
- Opioids13%52 of 403 claims
- Antibiotics4%18 of 403 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: 232024: 186709%
Drugs named by CMS: 9 in 2024, 1 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. Mario Marquist Ray scored 81 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 81 out of 100 for Dr. Ray for performance year 2024, reported as part of a group. Dr. Ray accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Ray's MIPS scores, performance year 2024
- 81of 100Final score
- 64.6of 100Quality
- 40of 100Improvement Activities
- 77of 100Cost
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. Mario Marquist Ray has 3 publications on record
Dmand AI links 3 papers to Dr. Ray in 2012. Dr. Ray's most frequent co-authors are Patricia E. Adams-Graves, MD, James E. Bailey, MD and Rami Nadim Khouzam, MD.
Papers3
Dr. Ray's most frequent co-authors
- Patricia E. Adams-Graves, MD1 shared paper
- James E. Bailey, MD1 shared paper
- Rami Nadim Khouzam, MD1 shared paper
Recent publications by Dr. Ray
BeerCreatine KinaseFluid Therapy
See who Dr. Ray researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ray works with, so you can find a warm path to the right hospitalists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mario Marquist Ray received $173 in industry payments from 2017 to 2022
CMS Open Payments shows 2 general payments to Dr. Ray from 2 drug and device companies from 2017 to 2022. Food and beverage make up the largest share, 100% of the total. Abbott Laboratories paid the most, $160.
General payments to Dr. Ray by program year, 2017 to 2022
Companies that paid Dr. Ray the most, 2017 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mario Marquist Ray graduated from University of Tennessee, Hsc, College of Medicine
Dr. Ray graduated from University of Tennessee, Hsc, College of Medicine in 2003.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mario Marquist Ray'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 DataDmand AI Org Hierarchy 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) |
| Publications, topics and co-authors | PubMed (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. Mario Marquist Ray
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. Mario Marquist Ray's NPI number?
Dr. Mario Marquist Ray's NPI number is 1326128364. It was assigned on October 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mario Marquist Ray?
Dr. Mario Marquist Ray is a hospitalist in Memphis, Tennessee. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Mario Marquist Ray practice?
Dr. Ray practices at 877 Jefferson Avenue, Memphis, TN 38103. Dr. Ray's primary practice is Regional Medical Center in Memphis, Tennessee, part of Shelby County Government. Dmand AI also links Dr. Ray to 1 hospital.
What is Dr. Mario Marquist Ray's office phone number?
The practice phone on file for Dr. Ray is (901) 545-7928.
What is Dr. Mario Marquist Ray's medical license number?
Dr. Ray holds Tennessee license 39663.
Which hospitals is Dr. Mario Marquist Ray affiliated with?
Dr. Ray practices at Regional Medical Center in Memphis, Tennessee. Dmand AI links Dr. Ray to 1 more hospital.
What medical group is Dr. Mario Marquist Ray part of?
Dr. Ray is linked to UT Regional One Physicians.
Does Dr. Mario Marquist Ray accept Medicare?
Yes. CMS data shows Dr. Ray billed Medicare for 606 services in 2024, and Dr. Ray accepts Medicare assignment.
What is Dr. Mario Marquist Ray's MIPS score?
Dr. Ray's MIPS final score for performance year 2024 is 81 out of 100, reported as part of a group.
How many Medicare patients does Dr. Mario Marquist Ray see?
CMS counts 121 Medicare patients who saw Dr. Ray in 2024, with an average age of 73.
Show 7 more questionsShow fewer questions
What services does Dr. Mario Marquist Ray bill to Medicare?
In 2024, Dr. Ray's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99239) and nursing facility care (99309).
Where did Dr. Mario Marquist Ray go to medical school?
Dr. Ray graduated from University of Tennessee, Hsc, College of Medicine in 2003.
What drugs does Dr. Mario Marquist Ray prescribe most?
In 2024 Medicare Part D data, Dr. Ray's most prescribed drugs by claims were Oxycodone HCl, Gabapentin and Methocarbamol.
Has Dr. Mario Marquist Ray received payments from drug or device companies?
CMS Open Payments shows $173 in general payments to Dr. Ray from 2 companies from 2017 to 2022. The largest total came from Abbott Laboratories.
How long has Dr. Mario Marquist Ray been practicing?
Dr. Ray graduated from medical school in 2003, 23 years ago.
Does Dr. Mario Marquist Ray do research?
Dmand AI links 3 publications to Dr. Ray.
Who does Dr. Mario Marquist Ray publish with?
Dr. Ray's most frequent co-authors are Patricia E. Adams-Graves, MD (1 shared paper), James E. Bailey, MD (1 shared paper) and Rami Nadim Khouzam, MD (1 shared paper).
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