Ya Ju Chang, MD
NPI 1801879119 · Rheumatology Physician · New York, NY
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ya Ju Chang, MD is a Rheumatology Physician provider in New York, NY (NPI 1801879119).
Provider details
- NPI number
- 1801879119
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 207546 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
715 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 231 | $101 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 228 | $143 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 135 | $9 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 57 | $75 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 42 | $186 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 67 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 3,284 | 460 |
| Gabapentin | 1,848 | 366 |
| Sulfasalazine | 1,563 | 220 |
| Methotrexate Sodiumbrand: Methotrexate | 1,300 | 180 |
| Prednisone | 1,226 | 323 |
| Famotidine | 1,150 | 252 |
| Diclofenac Sodium | 708 | 239 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,010 across 134 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-22
- Last updated
- 2025-04-15
- Certified
- 2025-04-15
Frequently asked questions
- What is Ya Ju Chang's NPI number?
- Ya Ju Chang's National Provider Identifier (NPI) is 1801879119, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ya Ju Chang's specialty?
- Ya Ju Chang is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Ya Ju Chang located?
- Ya Ju Chang's practice location on file with NPPES is 41 Elizabeth Street, New York, NY 10013-4637.
- What is Ya Ju Chang's phone number?
- The practice phone number listed in the NPPES registry for Ya Ju Chang is (212) 334-9591.
- Does Ya Ju Chang accept Medicare?
- Ya Ju Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ya Ju Chang's NPI active?
- Yes — Ya Ju Chang's NPI (1801879119) is active in the NPPES registry as of the last update on 2025-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.