Huan Chang
NPI 1336244870 · Rheumatology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Huan Chang is a Rheumatology Physician provider in Chicago, IL (NPI 1336244870).
Provider details
- NPI number
- 1336244870
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 036083242 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
287 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 151 | $100 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 57 | $17 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 42 | $59 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 26 | $149 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 11 | $135 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 264 | 64 |
| Adalimumabbrand: Humira(cf) Pen | 99 | 13 |
| Hydroxychloroquine Sulfate | 95 | 29 |
| Prednisone | 71 | 18 |
| Gabapentin | 68 | 15 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 65 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$58 across 2 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
- 2006-09-13
- Last updated
- 2009-08-31
Frequently asked questions
- What is Huan Chang's NPI number?
- Huan Chang's National Provider Identifier (NPI) is 1336244870, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Huan Chang's specialty?
- Huan Chang is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Huan Chang located?
- Huan Chang's practice location on file with NPPES is 1740 W Taylor St, Chicago, IL 60612-7232.
- What is Huan Chang's phone number?
- The practice phone number listed in the NPPES registry for Huan Chang is (866) 600-2273.
- Does Huan Chang accept Medicare?
- Huan Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Huan Chang's NPI active?
- Yes — Huan Chang's NPI (1336244870) is active in the NPPES registry as of the last update on 2009-08-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.