Dr. Changwan Ryu, MD
- Medicare services, 2024
- 78
- Medicare patients, 2024
- 52
- Part D claims, 2024
- 284
- MIPS score, 2024
- 87
- Hospital affiliations
- 3
- Practice address
- 20 York Street, New Haven, CT 06510
- Practice phone
- Call (203) 688-5900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Yale New Haven Psychiatric Hospital (York St)
Psychiatric Inpatient Facility · New Haven, Connecticut
Find Dr. Ryu'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. Changwan Ryu is an internist in New Haven, Connecticut
Dr. Ryu practices at Yale New Haven Psychiatric Hospital (York St) in New Haven, Connecticut.
Dr. Ryu's NPI, 1194992735, was assigned on May 13, 2008. Dr. Ryu graduated from New York Medical College in 2008. Dr. Ryu holds Connecticut license 53292.
- NPI
- 1194992735NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1850673351
- NPI enumeration date
- May 13, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (203) 688-5900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Changwan Ryu practices at Yale New Haven Psychiatric Hospital (York St) in New Haven, Connecticut
Dr. Ryu's primary practice is Yale New Haven Psychiatric Hospital (York St), at 20 York Street, New Haven, CT 06510. The practice phone is (203) 688-5900.
- Yale New Haven Psychiatric Hospital (York St)20 York Street, New Haven, CT 06510Phone(203) 688-5900
Source: Dmand AI Affiliation Data
Dr. Changwan Ryu is affiliated with 4 sites of care and 1 medical group
Dr. Ryu's primary practice is Yale New Haven Psychiatric Hospital (York St) in New Haven, Connecticut. Dr. Ryu is also affiliated with Yale New Haven Hospital. The medical group on file is Yale Health. Dmand AI also links Dr. Ryu to 2 more hospitals, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Changwan Ryu's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ryu practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Yale New Haven Psychiatric Hospital (York St) | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Changwan Ryu is one of 2,189 internists in Connecticut
Internal medicine is Dr. Ryu's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Ryu is licensed in Connecticut.
Specialties and state licenses
- Internal medicine, ConnecticutPrimary
Internists near Dr. Ryu
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. Changwan Ryu billed Medicare for 78 services in 2024
CMS data shows 78 Medicare services from Dr. Ryu across 2 procedure codes in 2024, for 52 Medicare patients. Medicare paid $11,986 for them.
Dr. Ryu's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 442024: 7877%
Where Dr. Ryu's Medicare services took place, 2024
- In an office2836%
- In a facility5064%
Dr. Ryu compared with the Connecticut median for internists, 2024
- Dr. Ryu
- Connecticut median
- Medicare services
- 78vs 39080% below
- Medicare patients
- 52vs 17270% below
- Part D claims
- 195vs 34343% below
Medians across 2,185 internists in Connecticut with Dmand AI profiles that report each measure.
Dr. Ryu'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. Changwan Ryu treated 52 Medicare patients in 2024, average age 75
CMS counts 52 Medicare patients who saw Dr. Ryu in 2024. The largest group is 75 to 84, with 21 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 46% are also on Medicaid. Their average risk score is 3.85, 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. Ryu's median patient age at 74, with 39% women.
Dr. Ryu's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Ryu's Medicare patients by sex, 2024
- Women2752%
- Men2548%
Chronic conditions among Dr. Ryu's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Heart failure65%
- COPD56%
- Chronic kidney disease52%
- Arthritis50%
- Mood disorders50%
- Anxiety48%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ryu'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
- Women39%
- Men61%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Changwan Ryu wrote 284 Medicare Part D claims in 2024
In 2024, Dr. Ryu wrote 284 Medicare Part D claims for 29 patients. 68% of them were for generic drugs. CMS names the drug for 195 of them, across 8 drugs with 11 or more claims each, at $283,417 in total drug cost. In 2023, CMS named 255 claims across 11 drugs.
Dr. Ryu's Part D claims by kind of drug, 2024
- Generic194 claims68%
- Brand-name90 claims32%
Dr. Ryu'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. Ryu's Part D claims, 2024
- Antibiotics11%31 of 284 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: 2552024: 19524%
Drugs named by CMS: 8 in 2024, 11 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. Changwan Ryu scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Ryu for performance year 2024, reported as part of a group. Dr. Ryu accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ryu as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Ryu's MIPS scores, performance year 2024
- 87of 100Final score
- 77.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 74of 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. Changwan Ryu received $245 in industry payments in 2019
CMS Open Payments shows 2 general payments to Dr. Ryu from 2 drug and device companies in 2019. Food and beverage make up the largest share, 59% of the total. Boehringer Ingelheim Pharmaceuticals, Inc. paid the most, $145.
General payments to Dr. Ryu by kind, 2019 to 2019
- Food and beverage$14559%
- Education$10041%
Companies that paid Dr. Ryu the most, 2019 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Changwan Ryu graduated from New York Medical College
Dr. Ryu graduated from New York Medical College in 2008.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Changwan Ryu'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) |
| 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. Changwan Ryu
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. Changwan Ryu's NPI number?
Dr. Changwan Ryu's NPI number is 1194992735. It was assigned on May 13, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Changwan Ryu?
Dr. Changwan Ryu is an internist in New Haven, Connecticut. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Changwan Ryu practice?
Dr. Ryu practices at 20 York Street, New Haven, CT 06510. Dr. Ryu's primary practice is Yale New Haven Psychiatric Hospital (York St) in New Haven, Connecticut. Dmand AI also links Dr. Ryu to 2 hospitals.
What is Dr. Changwan Ryu's office phone number?
The practice phone on file for Dr. Ryu is (203) 688-5900.
What is Dr. Changwan Ryu's medical license number?
Dr. Ryu holds Connecticut license 53292.
Which hospitals is Dr. Changwan Ryu affiliated with?
Dr. Ryu is affiliated with Yale New Haven Hospital. Dmand AI links Dr. Ryu to 2 more hospitals.
What medical group is Dr. Changwan Ryu part of?
Dr. Ryu is linked to Yale Health.
Does Dr. Changwan Ryu accept Medicare?
Yes. CMS data shows Dr. Ryu billed Medicare for 78 services in 2024, and Dr. Ryu accepts Medicare assignment.
Does Dr. Changwan Ryu offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Ryu as offering telehealth services.
What is Dr. Changwan Ryu's MIPS score?
Dr. Ryu's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Changwan Ryu see?
CMS counts 52 Medicare patients who saw Dr. Ryu in 2024, with an average age of 75.
What services does Dr. Changwan Ryu bill to Medicare?
In 2024, Dr. Ryu's most billed Medicare services were critical care (99291) and office visit, established patient (99215).
Where did Dr. Changwan Ryu go to medical school?
Dr. Ryu graduated from New York Medical College in 2008.
What drugs does Dr. Changwan Ryu prescribe most?
In 2024 Medicare Part D data, Dr. Ryu's most prescribed drugs by claims were Mycophenolate Mofetil, Albuterol Sulfate Hfa and Prednisone.
Has Dr. Changwan Ryu received payments from drug or device companies?
CMS Open Payments shows $245 in general payments to Dr. Ryu from 2 companies from 2019 to 2019. The largest total came from Boehringer Ingelheim Pharmaceuticals, Inc.
How long has Dr. Changwan Ryu been practicing?
Dr. Ryu graduated from medical school in 2008, 18 years ago.
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