HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / MI

MARK A SIERRA, MD

CARDIOVASCULAR DISEASE (CARDIOLOGY)

Graduated: 2002

Also: INTERNAL MEDICINE

NPI: 1639381593

Practice Locations (3)

MCLAREN BAY REGION

1900 COLUMBUS AVE, BAY REGIONAL

BAY CITY, MI 487086831

9898943278

MCLAREN MEDICAL GROUP

436 W MAIN ST

HALE, MI 487399246

9898943278

MCLAREN CENTRAL MICHIGAN

2110 S M, 76 SUITE 8

WEST BRANCH, MI 486618821

9895160100

Source: CMS National Downloadable File, September 2026.