William Mak D.O.
About this NPIWhat this record shows.
NPI 1811256258 is registered to William Mak D.O., a Pediatric Emergency Medicine practising at Suny At Stony Brook Department Of Pediatrics, Hsc T-11 / 040 in Stony Brook, New York. Pediatric Emergency Medicine is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy. William Mak D.O. has been enumerated in the National Provider Identifier (NPI) registry since 2012.
Your brand here.
Medicare enrollment
This provider holds 3 Medicare enrollments on file with the Provider Enrollment, Chain and Ownership System (PECOS). Each enrollment carries a public Medicare Enrollment ID (ENRLMT_ID) used by billers and intermediaries.
Practitioner
- I20161028000401Pediatric MedicineNY
- I20250314002037Emergency MedicineNY
- I20250624003167Pediatric MedicineFL
Source: CMS PECOS public enrollment file.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans William Mak D.O. accepts. To confirm in-network status with your specific health plan, contact William Mak D.O. directly at (631) 444-2020.
Frequently asked
Yes. NPI 1811256258 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Pediatric Emergency Medicine is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (631) 444-2020.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. William Mak D.O. is a Type-1 individual NPI.