Dr. Man-Siak Mak MD
About this NPIWhat this record shows.
NPI 1609875004 is registered to Dr. Man-Siak Mak MD, a Gastroenterology practising at 3349 G Street Ste. F in Merced, California. Gastroenterology is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy. Dr. Man-Siak Mak MD has been enumerated in the National Provider Identifier (NPI) registry since 2005.
Your brand here.
Secondary identifiers
Additional identifiers this provider has registered with NPPES. Used by medical billers, credentialers, and insurance verifiers to cross-reference claims and enrollments.
Medicaid
Source: NPPES public registry.
Medicare enrollment
This provider holds a Medicare enrollment 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
- I20081229000299GastroenterologyCA
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 Dr. Man-Siak Mak MD accepts. To confirm in-network status with your specific health plan, contact Dr. Man-Siak Mak MD directly at (209) 349-8459.
Frequently asked
Yes. NPI 1609875004 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Gastroenterology 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 (209) 349-8459.
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. Dr. Man-Siak Mak MD is a Type-1 individual NPI.