DR. WILLIAM T CHAO M.D.
NPI 1922063205
Pediatrics - Neonatal-Perinatal Medicine in Saint Louis, MO
About Dr. William T Chao M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM T CHAO M.D. (NPI 1922063205) is an individual neonatal-perinatal medicine provider in Saint Louis, Missouri, licensed in Missouri (R9BOO) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. William T Chao M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
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.
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
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 Chao's NPI number?
The NPI number for William Chao is 1922063205. It was assigned to this individual provider in the NPPES registry on April 19, 2006.
Where is William Chao located?
William Chao practices at 615 S New Ballas Rd, Saint Louis, MO 63141. The listed phone number is (314) 251-6450.
What is William Chao's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Neonatal-Perinatal Medicine, with taxonomy code 2080N0001X.
Is William Chao enrolled in Medicare?
Yes. William Chao is registered in the Medicare PECOS enrollment system.
What insurance does William Chao accept?
Health plans from Medica list William Chao as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for William Chao was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 37 days 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.
# Dr. William T Chao, M.D. · NPI 1922063205
Neonatal-Perinatal Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since April 19, 2006.
## Identity
- **NPI:** 1922063205 (Entity type: Individual)
- **Enumerated:** April 19, 2006
- **Primary specialty:** Pediatrics - Neonatal-Perinatal Medicine · taxonomy 2080N0001X
- **State license:** R9BOO (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 615 S NEW BALLAS RD, Saint Louis, MO 63141-8221
- **Phone:** (314) 251-6450
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
## Record status
- **NPPES last updated:** July 13, 2026
- **Other identifiers:** Other 2710209 (MO); Other R9BOO (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1922063205) · Data from the CMS NPPES public registry.