Justin Chang, MD
NPI 1841729910 · Family Medicine Physician · Madison, WI
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Chang, MD is a Family Medicine Physician provider in Madison, WI (NPI 1841729910).
Provider details
- NPI number
- 1841729910
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2017018876 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 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
774 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 215 | $109 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 183 | $73 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 136 | $105 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 73 | $159 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 40 | $108 |
| Critical Care, First 30-74 Minutes99291 | 38 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 57 | 13 |
| Furosemide | 51 | 21 |
| Empagliflozinbrand: Jardiance | 36 | — |
| Cefdinir | 25 | 25 |
| Metoprolol Tartrate | 22 | 11 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 21 | — |
| Prednisone |
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-06-12
- Last updated
- 2026-04-23
- Certified
- 2026-04-23
Frequently asked questions
- What is Justin Chang's NPI number?
- Justin Chang's National Provider Identifier (NPI) is 1841729910, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Chang's specialty?
- Justin Chang is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Chang located?
- Justin Chang's practice location on file with NPPES is 202 S Park St, Madison, WI 53715-1507.
- What is Justin Chang's phone number?
- The practice phone number listed in the NPPES registry for Justin Chang is (608) 417-5695.
- Does Justin Chang accept Medicare?
- Justin Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Chang's NPI active?
- Yes — Justin Chang's NPI (1841729910) is active in the NPPES registry as of the last update on 2026-04-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.