Dr. Casey Ren, MD
- Medicare services, 2024
- 766
- Medicare patients, 2024
- 265
- Part D claims, 2024
- 48
- MIPS score, 2024
- 89
- Hospital affiliations
- 2
- Practice address
- 300 Pasteur Drive, Stanford, CA 94305
- Practice phone
- Call (650) 723-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Casey Ren is an internist in Stanford, California
Dr. Ren practices at Stanford Hospital at 300 Pasteur Drive in Stanford, California, part of Stanford University.
Dr. Ren's NPI, 1447888003, was assigned on March 30, 2020. Dr. Ren holds California license A185349.
- NPI
- 1447888003NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0749649069
- NPI enumeration date
- March 30, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (650) 723-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Casey Ren practices at Stanford Hospital at 300 Pasteur Drive in Stanford, California
Dr. Ren's primary practice is Stanford Hospital at 300 Pasteur Drive, at 300 Pasteur Drive, Stanford, CA 94305 in Santa Clara County. The practice phone is (650) 723-4000.
- Stanford Hospital at 300 Pasteur Drive300 Pasteur Drive, Stanford, CA 94305 · Santa Clara CountyPhone(650) 723-4000
Source: Dmand AI Affiliation Data
Dr. Casey Ren is affiliated with 2 sites of care and 2 medical groups
Dr. Ren's primary practice is Stanford Hospital at 300 Pasteur Drive in Stanford, California, part of Stanford University. The medical group on file is Stanford Health Care. Dmand AI also links Dr. Ren to 1 more hospital and 1 medical group, each named with a free account. Dr. Ren's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Casey Ren's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ren practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Stanford Hospital at 300 Pasteur Drive | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Casey Ren is one of 16,751 internists in California
Internal medicine is Dr. Ren's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Ren is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Ren
Counts of internists 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. Casey Ren billed Medicare for 766 services in 2024
CMS data shows 766 Medicare services from Dr. Ren across 6 procedure codes in 2024, for 265 Medicare patients. Medicare paid $77,145 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Ren's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3202024: 766139%
Dr. Ren compared with the California median for internists, 2024
- Dr. Ren
- California median
- Medicare services
- 766vs 3612.1 times
- Medicare patients
- 265vs 15175% above
- Part D claims
- 99vs 42176% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Ren'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. Casey Ren treated 265 Medicare patients in 2024, average age 76
CMS counts 265 Medicare patients who saw Dr. Ren in 2024. The largest group is 65 to 74, with 77 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 44% are also on Medicaid. Their average risk score is 3.20, 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. Ren's median patient age at 58, with 45% women.
Dr. Ren's Medicare patients by age, 2024
Dr. Ren's Medicare patients by sex, 2024
- Women12848%
- Men13752%
Chronic conditions among Dr. Ren's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease51%
- Ischemic heart disease51%
- Diabetes49%
- Arthritis46%
- Heart failure46%
- Atrial fibrillation44%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ren's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 58
Patient panel by sex, all payers
- Women45%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Casey Ren wrote 48 Medicare Part D claims in 2024
In 2024, Dr. Ren wrote 48 Medicare Part D claims for 21 patients. 73% of them were for generic drugs. They cover 7 drugs, with $26,398 in total drug cost. In 2022, CMS named 54 claims across 4 drugs.
Dr. Ren's Part D claims by kind of drug, 2024
- Generic35 claims73%
- Brand-name13 claims27%
Dr. Ren's most prescribed drugs by claims, 2023
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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 542023: 9983%
Drugs named by CMS: 7 in 2023, 4 in 2022.
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. Casey Ren scored 89 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 89 out of 100 for Dr. Ren for performance year 2024, reported as part of a group. Dr. Ren accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Ren's MIPS scores, performance year 2024
- 89of 100Final score
- 87.1of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 70of 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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Sources for Dr. Casey Ren'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) |
| 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. Casey Ren
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. Casey Ren's NPI number?
Dr. Casey Ren's NPI number is 1447888003. It was assigned on March 30, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Casey Ren?
Dr. Casey Ren is an internist in Stanford, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Casey Ren practice?
Dr. Ren practices at 300 Pasteur Drive, Stanford, CA 94305. Dr. Ren's primary practice is Stanford Hospital at 300 Pasteur Drive in Stanford, California, part of Stanford University. Dmand AI also links Dr. Ren to 1 hospital and 1 medical group.
What is Dr. Casey Ren's office phone number?
The practice phone on file for Dr. Ren is (650) 723-4000.
What is Dr. Casey Ren's medical license number?
Dr. Ren holds California license A185349.
Which hospitals is Dr. Casey Ren affiliated with?
Dr. Ren practices at Stanford Hospital at 300 Pasteur Drive in Stanford, California. Dmand AI links Dr. Ren to 1 more hospital.
What medical group is Dr. Casey Ren part of?
Dr. Ren is linked to Stanford Health Care. Dmand AI links Dr. Ren to 1 more medical group.
Does Dr. Casey Ren accept Medicare?
Yes. CMS data shows Dr. Ren billed Medicare for 766 services in 2024, and Dr. Ren accepts Medicare assignment.
What is Dr. Casey Ren's MIPS score?
Dr. Ren's MIPS final score for performance year 2024 is 89 out of 100, reported as part of a group.
How many Medicare patients does Dr. Casey Ren see?
CMS counts 265 Medicare patients who saw Dr. Ren in 2024, with an average age of 76.
Show 3 more questionsShow fewer questions
What services does Dr. Casey Ren bill to Medicare?
In 2024, Dr. Ren's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
What drugs does Dr. Casey Ren prescribe most?
In 2023 Medicare Part D data, Dr. Ren's most prescribed drugs by claims were Atorvastatin Calcium, Losartan Potassium and Jardiance.
How long has Dr. Casey Ren been practicing?
Dr. Ren graduated from medical school in 2020, 6 years ago.
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