Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Man-Siak Mak, MD, Inc

Organization Gastroenterology Physician · NPI 1114115904

Man-Siak Mak, MD, Inc provides Gastroenterology Physician services in Merced, California. Licensed in California. Registered with an NPI since 2007.

Licensed in
CA
In the registry since
2007
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

3313 M St
Merced, CA 95348-2714 Not confirmed with CMS for 19 years — call before visiting
Phone: (209) 722-1565
Fax: (209) 722-1567
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence A26785 (CA)

Record details

NPI number1114115904
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Man-Siak Mak — President · (209) 722-1565
NPI enumeratedOctober 5, 2007
Last updated in NPPESOctober 5, 2007
Mailing addressPo Box 2793, Merced, CA 95344-0793

Other providers in Merced