Patrick Chang, MD
NPI 1861467656 · Internal Medicine Physician · Mather, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Patrick Chang, MD is a Internal Medicine Physician provider in Mather, CA (NPI 1861467656).
Provider details
- NPI number
- 1861467656
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 21908 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-23
- Last updated
- 2025-12-26
- Certified
- 2025-12-26
Frequently asked questions
- What is Patrick Chang's NPI number?
- Patrick Chang's National Provider Identifier (NPI) is 1861467656, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Patrick Chang's specialty?
- Patrick Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Patrick Chang located?
- Patrick Chang's practice location on file with NPPES is 10535 Hospital Way, Mather, CA 95655-4200.
- What is Patrick Chang's phone number?
- The practice phone number listed in the NPPES registry for Patrick Chang is (916) 843-7000.
- Does Patrick Chang accept Medicare?
- Patrick Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Patrick Chang's NPI active?
- Yes — Patrick Chang's NPI (1861467656) is active in the NPPES registry as of the last update on 2025-12-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.