Dr. Ryan Brent Day, MD, PhD
- Medicare services, 2024
- 169
- Medicare patients, 2024
- 31
- Part D claims, 2024
- 15
- MIPS score, 2024
- 84
- Hospital affiliations
- 1
- Practice address
- One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110
- Practice phone
- Call (314) 747-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Day's professional email, personal email and mobile number
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Dr. Ryan Brent Day is a medical oncologist in Saint Louis, Missouri
Dr. Day practices at Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health.
Dr. Day's NPI, 1417307976, was assigned on June 15, 2016. Dr. Day graduated from Washington University School of Medicine in 2016. Dr. Day holds Missouri license 2019032162.
- NPI
- 1417307976NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385926005
- NPI enumeration date
- June 15, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (314) 747-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ryan Brent Day practices at 2 locations in Saint Louis, Missouri
Dr. Day's primary practice is Barnes-Jewish Hospital, at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 in St. Louis City. The practice phone is (314) 747-3000. Dr. Day also practices at Barnes-Jewish Hospital, 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110.
- Barnes-Jewish HospitalPrimaryOne Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 · St. Louis CityPhone(314) 747-3000
- Barnes-Jewish Hospital1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110 · Saint Louis CityPhone(314) 747-3000
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Ryan Brent Day is affiliated with 2 sites of care and 1 medical group
Dr. Day's primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. The medical group on file is WashU Medicine Psychiatry. Dmand AI also links Dr. Day to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Ryan Brent Day's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Day practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Barnes-Jewish Hospital | 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. Ryan Brent Day is one of 120 medical oncologists in Missouri
Medical oncology is Dr. Day's primary specialty in the NPI Registry, under taxonomy code 207RX0202X. Dr. Day is licensed in Missouri.
Specialties and state licenses
- Medical oncology, MissouriPrimary
Medical oncologists near Dr. Day
Counts of medical oncologists 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. Ryan Brent Day billed Medicare for 169 services in 2024
CMS data shows 169 Medicare services from Dr. Day across 2 procedure codes in 2024, for 31 Medicare patients. Medicare paid $14,257 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Day's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3892024: 16957%
Dr. Day compared with the Missouri median for medical oncologists, 2024
- Dr. Day
- Missouri median
- Medicare services
- 169vs 1,24686% below
- Medicare patients
- 31vs 22486% below
- Part D claims
- 564vs 560Close to median
Medians across 125 medical oncologists in Missouri with Dmand AI profiles that report each measure.
Dr. Day'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. Ryan Brent Day treated 31 Medicare patients in 2024, average age 69
CMS counts 31 Medicare patients who saw Dr. Day in 2024. The largest group is 65 to 74, with 20 patients. 74% of them have high blood pressure, and 61% have high cholesterol. Their average risk score is 3.04, 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. Day's median patient age at 70, with 48% women.
Dr. Day's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Day's Medicare patients by sex, 2024
- Women1342%
- Men1858%
Chronic conditions among Dr. Day's Medicare patients, 2024
- High blood pressure74%
- High cholesterol61%
- Chronic kidney disease52%
- Arthritis42%
- Ischemic heart disease42%
- Atrial fibrillation39%
- Heart failure39%
- Mood disorders39%
Share of Medicare patients with each condition. A patient can have several.
Dr. Day's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women48%
- Men52%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Ryan Brent Day wrote 15 Medicare Part D claims in 2024
In 2024, Dr. Day wrote 15 Medicare Part D claims. 80% of them were for generic drugs. They cover 24 drugs, with $11,304 in total drug cost. In 2017, CMS named 714 claims across 29 drugs.
Dr. Day's Part D claims by kind of drug, 2024
- Generic12 claims80%
- Brand-name and other3 claims20%
Dr. Day's most prescribed drugs by claims, 2018
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, 2017 to 2018
- 2017
- 2018
- Claims for drugs CMS names
- 2017: 7142018: 56421%
Drugs named by CMS: 24 in 2018, 29 in 2017.
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. Ryan Brent Day scored 84 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 84 out of 100 for Dr. Day for performance year 2024, reported as part of a group. Dr. Day accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Day's MIPS scores, performance year 2024
- 84of 100Final score
- 71.6of 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.
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. Ryan Brent Day received $555 in industry payments from 2017 to 2025
CMS Open Payments shows 8 general payments to Dr. Day from 7 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 58% of the total. Bristol-Myers Squibb Company paid the most, $125.
General payments to Dr. Day by program year, 2017 to 2025
General payments to Dr. Day by kind, 2017 to 2025
- Food and beverage$32458%
- Education$23242%
Companies that paid Dr. Day the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ryan Brent Day graduated from Washington University School of Medicine
Dr. Day graduated from Washington University School of Medicine in 2016.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Ryan Brent Day'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 Affiliation DataDmand AI Practice 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) |
| 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. Ryan Brent Day
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What is Dr. Ryan Brent Day's NPI number?
Dr. Ryan Brent Day's NPI number is 1417307976. It was assigned on June 15, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. Ryan Brent Day?
Dr. Ryan Brent Day is a medical oncologist in Saint Louis, Missouri. The primary specialty in the NPI Registry is Medical Oncology Physician (taxonomy code 207RX0202X).
Where does Dr. Ryan Brent Day practice?
Dr. Day practices at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110. Dr. Day also practices at 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110. Dr. Day's primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. Dmand AI also links Dr. Day to 1 group practice or clinic.
What is Dr. Ryan Brent Day's office phone number?
The practice phone on file for Dr. Day is (314) 747-3000.
What is Dr. Ryan Brent Day's medical license number?
Dr. Day holds Missouri license 2019032162.
Which hospitals is Dr. Ryan Brent Day affiliated with?
Dr. Day practices at Barnes-Jewish Hospital in Saint Louis, Missouri.
What medical group is Dr. Ryan Brent Day part of?
Dr. Day is linked to WashU Medicine Psychiatry.
Does Dr. Ryan Brent Day accept Medicare?
Yes. CMS data shows Dr. Day billed Medicare for 169 services in 2024, and Dr. Day accepts Medicare assignment.
What is Dr. Ryan Brent Day's MIPS score?
Dr. Day's MIPS final score for performance year 2024 is 84 out of 100, reported as part of a group.
How many Medicare patients does Dr. Ryan Brent Day see?
CMS counts 31 Medicare patients who saw Dr. Day in 2024, with an average age of 69.
Show 5 more questionsShow fewer questions
What services does Dr. Ryan Brent Day bill to Medicare?
In 2024, Dr. Day's most billed Medicare services were hospital inpatient care (99233) and hospital inpatient care (99232).
Where did Dr. Ryan Brent Day go to medical school?
Dr. Day graduated from Washington University School of Medicine in 2016.
What drugs does Dr. Ryan Brent Day prescribe most?
In 2018 Medicare Part D data, Dr. Day's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Hydrochlorothiazide.
Has Dr. Ryan Brent Day received payments from drug or device companies?
CMS Open Payments shows $555 in general payments to Dr. Day from 7 companies from 2017 to 2025. The largest total came from Bristol-Myers Squibb Company.
How long has Dr. Ryan Brent Day been practicing?
Dr. Day graduated from medical school in 2016, 10 years ago.
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