Update this page – If you believe information in your NPPES record is inaccurate, or if you wish to update or deactivate your NPI, you can do so directly with CMS.
Individual
DR. WILLIAM CHERNIAK
Active
Individual
DR. WILLIAM CHERNIAK
Active
Sole proprietor
Yes
Provider details
NPI number
Gender
Man
Credential
MD, MPH
Taxonomy
Speciality
Code
Description
License number
State
207P00000X
Emergency Medicine Physician
Primary
A157750
CA
261QU0200X
Urgent Care Clinic/Center
D80655
MD
Other
Enumeration date
12/29/2015
Last updated
08/11/2026
About Stedi
Stedi is the only programmable healthcare clearinghouse. You can use Stedi's APIs to process eligibility checks, claims, remits, and more.
Sign up