Who owns Mark Twain Medical Center?

768 Mountain Ranch Rd · San Andreas, CA · 95249

Overview

Beds25

Discharges667cost report 2024

Occupancy30%inpatient days ÷ bed days

Employees (FTE)226

Mark Twain Medical Center is a critical access hospital in San Andreas, California, operated by CommonSpirit Health. Calaveras County has 1 hospitals, 1 nursing homes and 1 urgent care centers.

Ownership

Mark Twain Medical Center is operated by CommonSpirit Health.

Operator

CommonSpirit Health

Owner group

CommonSpirit Health

Ownership type

Other

Sources

CMS Hospital All Owners · 2026-09-29
irs_schedule_h · 202506

Ownership history

Every dated change of operator and owner for Mark Twain Medical Center, with the source for each.

Request the history

Full ownership tree of CommonSpirit Health

Every entity between this facility and its ultimate owner, with ownership percentages and dates.

See the owner report

Finances

From the hospital's Medicare cost report, fiscal year ending 2024.

Net patient revenue	$86.8M
Operating expenses	$88.9M
Net income	−$463K
Net income as a share of net patient revenue	-0.5%
Uncompensated care cost	$3.3M
Charity care cost	$1.8M
Medicaid net revenue	$11.5M

Payer mix by inpatient days (2024)

Commercial and other 49.9%
Medicare 45.1%
Medicaid 5.0%

Location and market

Address: 768 Mountain Ranch Rd · San Andreas, CA · 95249
County: Calaveras County
State: California

Hospitals in the county1

Nursing homes1

Urgent care centers1

Nearby hospitals

Name	City	Distance
Sutter Amador Hospital	Jackson	12.3 mi
Adventist Health Sonora	Sonora	21.8 mi

Sources and identifiers

Operator: CMS Hospital All Owners · irs_schedule_h
Finances and payer mix: CMS hospital cost reports (HCRIS), fiscal year 2024
Ownership type and beds: CMS Provider of Services file
Location: CMS and Census Bureau geography

CMS certification number: 051332
NPI: 1508968819
Last confirmed: 2026-10-23

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