Mark Twain Medical Center in San Andreas, CA
In a medical emergency, call 911. This page is for information only.
About Mark Twain Medical Center
Mark Twain Medical Center is a critical access hospital in San Andreas, Calaveras County, California. It reports its ownership to Medicare as nonprofit (other). It does not report emergency services to Medicare. Its CMS Overall Hospital Quality Star Rating is 3 out of 5. It has 25 licensed beds, according to state license data via HIFLD. The nearest other listed hospital is Sutter Amador Hospital, about 12 mi away.
Quality ratings
How this hospital compares with the national rate on each measure group:
Source: Centers for Medicare & Medicaid Services, Hospital General Information. How star ratings work.
Emergency room times
Lower times are better. Reporting period ending September 2025. Source: CMS Timely and Effective Care. What these numbers mean.
Infections and sepsis care
- Clostridioides difficile (C. diff) infectionsNo different · SIR 0.00
71% of patients with severe sepsis or septic shock received all the recommended early care steps (SEP-1). Higher is better.
SIR is the standardized infection ratio: below 1 means fewer infections than predicted for a hospital like this one. Period ending September 2025. Source: CMS Healthcare-Associated Infections and Timely and Effective Care.
What patients say
- Patient survey star rating
- Would definitely recommend73%
- Rated the hospital 9 or 1078%
- Completed surveys151
Survey period ending September 2025. Source: CMS HCAHPS Patient Survey.
Map
38.18947, -120.66695
Nearest hospitals with an emergency room
Nearby hospitals
Frequently asked questions
Where is Mark Twain Medical Center located?
Mark Twain Medical Center is at 768 Mountain Ranch Rd, San Andreas, CA 95249 in Calaveras County.
Does Mark Twain Medical Center have an emergency room?
Mark Twain Medical Center does not report emergency services to Medicare. The nearest listed hospital with an emergency room is Sutter Amador Hospital, about 12 mi away. In a life-threatening emergency, call 911.
What is the CMS star rating of Mark Twain Medical Center?
Mark Twain Medical Center has a CMS Overall Hospital Quality Star Rating of 3 out of 5. The rating combines measures of mortality, safety of care, readmission, patient experience and timely and effective care, compared with hospitals nationwide.
What is the phone number of Mark Twain Medical Center?
The main phone number on record with Medicare is (209) 754-3521.
Would patients recommend Mark Twain Medical Center?
In the most recent HCAHPS patient survey (151 completed surveys), 73% of patients said they would definitely recommend the hospital, and 78% rated it 9 or 10 out of 10.
Related guides
- Types of Hospitals in the USAcute care, critical access, children's, psychiatric, long-term care and federal hospitals explained, plus how ownership differs.
- What Is a Critical Access Hospital?The 25-bed, 96-hour and 35-mile rules, what care a critical access hospital provides, and how it differs from a rural emergency hospital.
- Hospital Financial Assistance and Charity CareHow IRS 501(r) rules work, who usually qualifies for free or discounted care, and how to apply step by step.
- Observation vs Inpatient StatusWhy an overnight stay may count as outpatient care, the Two-Midnight Rule, the MOON notice and the 3-day rule for nursing facility coverage.