DR. WILLIAM WEN-LONG YANG MD
NPI 1790979011
Ophthalmology in Springfield, IL
About Dr. William Wen-long Yang Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM WEN-LONG YANG MD (NPI 1790979011) is an individual ophthalmology provider in Springfield, Illinois, licensed in Illinois (036126329) and active in the NPI registry since August 2007. He is enrolled in Medicare PECOS, is affiliated with St Johns Hospital, and maintains a secondary practice location in Walla Walla.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. William Wen-long Yang Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Johns Hospital
Acute Care Hospitals · Springfield, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 62704 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is William Yang's NPI number?
The NPI number for William Yang is 1790979011. It was assigned to this individual provider in the NPPES registry on August 29, 2007.
Where is William Yang located?
William Yang practices at 2020 W Iles Ave, Springfield, IL 62704. The listed phone number is (217) 698-3030.
What is William Yang's specialty?
The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.
Is William Yang enrolled in Medicare?
Yes. William Yang is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Is William Yang affiliated with any hospitals?
According to CMS data, William Yang is affiliated with St Johns Hospital.
When was this NPI record last updated?
The NPPES record for William Yang was last updated on February 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
