Walter Chang, MD
NPI 1689044760 · Family Medicine Physician · Gardena, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Walter Chang, MD is a Family Medicine Physician provider in Gardena, CA (NPI 1689044760).
Provider details
- NPI number
- 1689044760
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A158199 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
13 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 | 13 | $130 |
Typical Medicare-allowed amounts for these services range $130–$130 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
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 | 634 | 259 |
| Amlodipine Besylate | 454 | 190 |
| Lisinopril | 308 | 115 |
| Losartan Potassium | 232 | 96 |
| Rosuvastatin Calcium | 184 | 78 |
| Metformin Hclbrand: Metformin Hcl Er | 175 | 75 |
Practice location
Mailing address
Additional practice locations (2)
- 450 E Spring St Ste 1Long Beach, CA 90806-1625Phone: (408) 933-0050Fax: (408) 933-0078
- 4610 X StSacramento, CA 95817-2200Phone: (408) 839-7368
Registry dates
- Enumerated
- 2015-10-01
- Last updated
- 2026-02-20
- Certified
- 2026-02-20
Frequently asked questions
- What is Walter Chang's NPI number?
- Walter Chang's National Provider Identifier (NPI) is 1689044760, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter Chang's specialty?
- Walter Chang is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Walter Chang located?
- Walter Chang's practice location on file with NPPES is 15446 S Western Ave, Gardena, CA 90249-4319.
- What is Walter Chang's phone number?
- The practice phone number listed in the NPPES registry for Walter Chang is (833) 574-2273.
- Does Walter Chang accept Medicare?
- Walter Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Walter Chang's NPI active?
- Yes — Walter Chang's NPI (1689044760) is active in the NPPES registry as of the last update on 2026-02-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.