Wesley Chang, M.D.
NPI 1174593453 · Internal Medicine Physician · Anaheim, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Wesley Chang, M.D. is a Internal Medicine Physician provider in Anaheim, CA (NPI 1174593453).
Provider details
- NPI number
- 1174593453
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G44205 (CA)
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
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
1,060 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 | 397 | $89 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 293 | $129 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 168 | $9 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 102 | $127 |
| Administration of Influenza Virus VaccineG0008 | 54 | $29 |
| Manual Urinalysis Test With Examination Using Microscope, Non-Automated81000 | 32 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 94 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 330 | 94 |
| Amlodipine Besylate | 130 | 40 |
| Losartan Potassium | 122 | 37 |
| Levothyroxine Sodium | 111 | 32 |
| Metformin Hcl | 104 | 29 |
| Alprazolam | 88 | 19 |
| Lisinopril |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$772 across 22 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
- 2006-01-26
- Last updated
- 2017-04-27
Frequently asked questions
- What is Wesley Chang's NPI number?
- Wesley Chang's National Provider Identifier (NPI) is 1174593453, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Wesley Chang's specialty?
- Wesley Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Wesley Chang located?
- Wesley Chang's practice location on file with NPPES is 6200 E Canyon Rim Rd, Anaheim, CA 92807-4313.
- What is Wesley Chang's phone number?
- The practice phone number listed in the NPPES registry for Wesley Chang is (714) 974-8130.
- Does Wesley Chang accept Medicare?
- Wesley Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Wesley Chang's NPI active?
- Yes — Wesley Chang's NPI (1174593453) is active in the NPPES registry as of the last update on 2017-04-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.