# Man-Siak Mak, MD

Source: https://ourhealthnetwork.com/doctor/mansiak-mak-md-1609875004
NPI: 1609875004
Data source: CMS NPI Registry (DAC), refreshed monthly

## Quick facts

Man-Siak Mak, MD is a gastroenterology based in Merced, CA practicing at Timothy S Johnston Md Pc with NPI 1609875004.

## Profile

- Primary specialty: Gastroenterology
- Secondary specialties: INTERNAL MEDICINE
- Credential: MD
- Gender: Male
- Graduation year: 1968
- NPI: 1609875004 ([NPPES record](https://npiregistry.cms.hhs.gov/provider-view/1609875004))

## Practice and contact

- Practice name: Timothy S Johnston Md Pc
- Address: 3349 G St, Suite B, Merced, CA, 953400978
- Phone: 20934984592245
- Group practice size: 9 members

## Insurance accepted (8 networks)

This provider is in network with the following insurance carriers, based on federal Transparency in Coverage filings and FHIR provider directories:

- [Cigna](https://ourhealthnetwork.com/insurance/cigna) — 18 plans
- [UnitedHealthcare](https://ourhealthnetwork.com/insurance/unitedhealthcare) — 11 plans
- [Aetna](https://ourhealthnetwork.com/insurance/aetna) — 3 plans
- [Blue Shield of California](https://ourhealthnetwork.com/insurance/blue-shield-of-california) — 3 plans
- [Humana](https://ourhealthnetwork.com/insurance/humana) — 3 plans
- [UMR](https://ourhealthnetwork.com/insurance/umr) — 3 plans
- [Oxford Health Plans (UHC)](https://ourhealthnetwork.com/insurance/oxford-health-plans-uhc) — 2 plans
- [Medicare](https://ourhealthnetwork.com/insurance/medicare) — 1 plan

To verify a specific plan covers Man-Siak Mak, use the [OurHealthNetwork Insurance Matcher](https://ourhealthnetwork.com/tools/insurance-matcher?npis=1609875004).

## Related on OurHealthNetwork

- [More Gastroenterology doctors in MERCED, CA](https://ourhealthnetwork.com/gastroenterology/ca/merced)
- [Find insurance plans that cover this doctor](https://ourhealthnetwork.com/tools/insurance-matcher?npis=1609875004)
- [Browse all 5.5M US healthcare providers](https://ourhealthnetwork.com/find-doctors)
- [About our data and methodology](https://ourhealthnetwork.com/methodology)