Skip to the page content
Your donations
Passes our checks

Mammoth Hospital Foundation

EIN 20-2601653 · Mammoth Lakes, CA

Public records show a registered, tax-exempt organization in good standing.

LegitimacyPassesRegistration and standingFinancial healthGood75 out of 100GovernanceFair65 out of 100Impact evidenceDescribes programsHow well its results are evidenced

What it says it does

Promotion of medical, hospital and healthcare services throughout Mono and Inyo counties within the Eastern Sierra Nevada region, California. Provide assistance to people in need of Health Care as well as funds for advancements in facilities, technologies and programs.

Income
$2.3 million
Spending
$1.5 million
Spent on programs
81%
Reserves
1.7 months of spending
Largest source of income
donations and private grants, 100%
Employees
0
Volunteers
6
Highest pay
$141,206, executive director

Source: Form 990 for the year ending June 30, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Financial health

Good: 75 out of 100. Higher than 50% of charities in its peer group (health care, $1m to $10m).

  • Reserves

    10 of 35

    Spendable reserves would cover 1.7 months of spending.

  • Debt

    20 of 20

    It owes 5% of what it owns.

  • Living within its means

    15 of 15

    Income exceeded spending by 36% of income.

  • Income trend

    15 of 15

    Income rose 135% on the year before.

  • Spending floor

    15 of 15

    81% of spending went to programs and raising each dollar of donations cost 7 cents.

Source: Form 990 for the year ending June 30, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Governance

Fair: 65 out of 100. Higher than 14% of charities in its peer group (health care, $1m to $10m).

  • Independent board

    25 of 25

    6 of 6 voting board members are independent.

  • Conflict of interest policy

    0 of 15

    Reports no written conflict of interest policy.

  • Whistleblower policy

    0 of 8

    Reports no written whistleblower policy.

  • Record keeping policy

    0 of 7

    Reports no written policy on keeping and destroying records.

  • Board minutes

    5 of 5

    Keeps minutes of board meetings.

  • Board sees the tax return

    10 of 10

    Gave the board a copy of this return before filing it.

  • Pay set independently

    0 of 5

    Reports no independent review process for its chief executive's pay.

  • Independent check of accounts

    15 of 15

    Its accounts were audited by an independent accountant.

  • No reported misuse

    10 of 10

    Reports no diversion of assets, excess benefits or loans to insiders.

Source: Form 990 for the year ending June 30, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Impact evidence

Describes programs. Its tax return describes what it does but we have found no measurable results in it.

Programs described in its return (4)
  1. $525,505 spent. CT Project: The Foundation funded the acquisition of Mammoth Hospitals new, state-of-the-art CT scanner. This project enhances patient safety, improves clinical excellence, and provides critical access to advanced diagnostic imaging for the region.
  2. $320,464 spent. Other Program Services: The Foundation provided broad support across numerous hospital and community initiatives. This included funding for staff development to ensure clinical excellence; support for Mammoth Hospitals mammography program to ensure cost is not a barrier to screening; and funding for the Cancer Outreach, Infusion, and Rhiannons Kids programs to alleviate the financial burden of travel and treatment for patients. Additional support was directed to community wellness programs and scholarships for lower income families enrolled in the hospital preschool.
  3. $205,398 spent. Hospital Programs: Unrestricted funds were deployed to support a range of critical hospital needs. A significant portion of these funds ($180,737) was allocated to the purchase of the new CT scanner. Additional investments supported professional development for the hospital staff, including specialized telemetry training for the Med/Surg department and phlebotomy training for Emergency Department EMTs. Funds also provide pediatric books during wellness visits.
  4. $150,731 spent. Capital Outlay: Through the generous support of the Mammoth Hospital Auxiliary, the Foundation funded the purchase of life-saving medical equipment. This included a new portable X-ray machine, blood warmers, and surical stirrups, directly enhancing the hospitalss capacity for rapid diagnosis and effective patient care.

Source: Form 990 for the year ending June 30, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Legitimacy checks

  1. Is it registered with the IRS? Passed.

    Listed in the IRS master file of tax-exempt organizations as a 501(c)(3) charitable organization.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  2. Has the IRS revoked its tax-exempt status? Passed.

    Not on the IRS automatic revocation list.

    Source: Automatic revocation of exemption list, Internal Revenue Service, file dated October 13, 2026.

  3. Are donations tax-deductible? Passed.

    On the IRS list of organizations eligible to receive tax-deductible contributions.

    Source: Publication 78 data: organizations eligible for tax-deductible contributions, Internal Revenue Service, file dated October 13, 2026.

  4. Is it keeping up with its IRS filings? Passed.

    Most recent return on file covers the year ending June 2025.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  5. How long has it been tax-exempt? Passed.

    Recognized by the IRS since March 2008.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  6. Is it in good standing with state regulators? Passed.

    Not on California's list of charities barred from soliciting. Other states are not yet checked.

    Source: May Not Operate or Solicit for Charitable Purposes list, California Attorney General, Registry of Charities and Fundraisers, file dated October 21, 2026.

  7. Could it be confused with another charity? Worth knowing.

    A much larger organization has a similar name: Hoag Hospital Foundation (Newport Beach, CA), EIN 95-3222343. If that is the one you meant, check the EIN before giving.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

Ratings and checks are our reading of public records, using the published method. They are not a statement about anyone's honesty. If you work for this organization, you can send corrections or results, confirm you want gifts through Veridonate, or ask to be removed from giving.