Stephen Chang, MD
NPI 1043715410 · Family Medicine Physician · Tustin, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Chang, MD is a Family Medicine Physician provider in Tustin, CA (NPI 1043715410).
Provider details
- NPI number
- 1043715410
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A164576 (CA)
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
8 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
916 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 386 | $106 |
| 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 | 274 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 87 | $81 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 71 | $146 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 38 | $180 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 46 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 125 | 44 |
| Losartan Potassium | 106 | 34 |
| Amlodipine Besylate | 89 | 33 |
| Levothyroxine Sodium | 57 | 22 |
| Omeprazole | 52 | 21 |
| Metformin Hcl | 51 | 17 |
| Rosuvastatin Calcium |
Practice location
Mailing address
Additional practice locations (1)
- 101 the City Dr S Ste 835Orange, CA 92868-3201Phone: (714) 456-5530
Registry dates
- Enumerated
- 2018-03-28
- Last updated
- 2022-11-03
- Certified
- 2022-11-03
Frequently asked questions
- What is Stephen Chang's NPI number?
- Stephen Chang's National Provider Identifier (NPI) is 1043715410, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Chang's specialty?
- Stephen Chang is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Chang located?
- Stephen Chang's practice location on file with NPPES is 1451 Irvine Blvd, Tustin, CA 92780-3804.
- What is Stephen Chang's phone number?
- The practice phone number listed in the NPPES registry for Stephen Chang is (714) 838-8878.
- Does Stephen Chang accept Medicare?
- Stephen Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Chang's NPI active?
- Yes — Stephen Chang's NPI (1043715410) is active in the NPPES registry as of the last update on 2022-11-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.