Changwan Ryu, MD
NPI 1194992735 · Internal Medicine Physician · New Haven, CT
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Changwan Ryu, MD is a Internal Medicine Physician provider in New Haven, CT (NPI 1194992735).
Provider details
- NPI number
- 1194992735
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 53292 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
78 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 50 | $217 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 28 | $159 |
Typical Medicare-allowed amounts for these services range $159–$217 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Mycophenolate Mofetil | 48 | — |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 30 | — |
| Prednisone | 25 | 12 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 21 | — |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 21 | — |
| Nintedanib Esylatebrand: Ofev | 20 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-05-13
- Last updated
- 2014-09-15
Frequently asked questions
- What is Changwan Ryu's NPI number?
- Changwan Ryu's National Provider Identifier (NPI) is 1194992735, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Changwan Ryu's specialty?
- Changwan Ryu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Changwan Ryu located?
- Changwan Ryu's practice location on file with NPPES is 20 York St # T-209, New Haven, CT 06510-3220.
- What is Changwan Ryu's phone number?
- The practice phone number listed in the NPPES registry for Changwan Ryu is (603) 252-6293.
- Does Changwan Ryu accept Medicare?
- Changwan Ryu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Changwan Ryu's NPI active?
- Yes — Changwan Ryu's NPI (1194992735) is active in the NPPES registry as of the last update on 2014-09-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.