Critical access hospital · Mammoth Lakes, California · 15 beds · CMS certification number 051303
Mammoth Hospital
Its Medicare cost reports, read cell by cell. Latest filing: fiscal year ended June 30, 2025, as submitted, stamped by CMS November 17, 2025. 24 years on file, every one shown below. Also on the 340B covered-entity register.
Fiscal 2025 at a glance
What stands out
- Net patient revenue rose from $20.1M in its first year on file (2002) to $112.1M in 2025.
- Its result from patient care: $4.0M (2023), $5.6M (2024), $4.7M (2025).
- 1 of the 5 critical access hospital peers below with a margin on file also reports a gain on patient care for fiscal year 2025.
- Medicaid paid for 13.5% of its inpatient days and Medicare for 31.0%.
Every statement is drawn from figures on this page; nothing is estimated.
24 years of filings
Net patient revenue against operating expenses, each year as filed.
settled
settled
settled
reopened
as submitted
settled
settled
settled
settled
settled with audit
settled
reopened
settled
settled
settled
settled
settled
settled
settled with audit
settled with audit
as submitted
as submitted
as submitted
as submitted
Beside its peers
Critical access hospitals in California with under 25 beds, each on fiscal year 2025.
| Hospital | Beds | Net patient revenue | Operating expenses | Margin |
|---|---|---|---|---|
| Mammoth Hospital | 15 | $112,050,282 | $107,367,326 | 4.2% |
| John C Fremont Healthcare District, Mariposa | 18 | $29,551,191 | $36,773,106 | −24.4% |
| Mayers Memorial Hospital District, Fall River Mills | 16 | $50,469,639 | $51,383,119 | −1.8% |
| George L. Mee Memorial Hospital, King City | 13 | $77,584,924 | $73,252,909 | 5.6% |
| Mountains Community Hospital, Lake Arrowhead | 17 | $38,298,570 | $42,076,058 | −9.9% |
| Plumas District Hospital, Quincy | 14 | $45,242,149 | $45,683,943 | −1.0% |
Patients and payers
- Discharges
- 439S-3 line 14, col 15
- Inpatient days
- 1,190S-3 line 14, col 8
- Beds in use, on an average day
- 3.3days ÷ days in year
- Occupancy
- 21.7%days ÷ bed days
- Medicare share of days
- 31.0%S-3 cols 6 ÷ 8
- Medicaid share of days
- 13.5%S-3 cols 7 ÷ 8
Who owns it
Type of control on its cost report: governmental, hospital district.
Follow this hospital, free
We send this record now and tell you when it files again.
More critical access hospitals in California
From the publisher of Velarion Records
Velarion Intel
Independent Decision-Grade Intelligence
Compensation and corporate governance intelligence for advisors, investors and companies. Executive and board pay for public companies, benchmarked against peers.
Figures: CMS Healthcare Cost Report Information System, file HOSP10FY2024.ZIP, form CMS-2552-10, filed under CMS certification number 051303. Patients and payers: worksheet S-3 Part I of the same filing.
How this page was built: the CMS Medicare cost report, file HOSP10FY2024.ZIP, read November 17, 2025.