MAMMOTH HOSPITAL AUXILIARY INC

EIN 95-3141984 MAMMOTH LAKES, CA

Revenue 2024: $428,491
Expenses 2024: $411,774

Program services were 60.9% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection: 03
NTEE code: E22J
Classification: 1000
Street: PO BOX 1399

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Mission and programs · 2024

Mission

To provide support for the medical needs of the community of Mammoth Lakes which includes grants for the purchase of Mammoth Hospital equipment, promoting good healthcare in the hospital and community, and sponsoring medically related education.

Purchase hospital equipment for the Mammoth Hospital based upon their requested needs.

Expenses $201,072
Provide continuing education for hospital employees, either as in-house training for staff based upon hospital approved programs or for reimbursed costs for attending continuing education courses.

Expenses $20,000
Provide (6) college scholarships: (1) for $5,000, (1) for $3,500, (1) for $2,000, (1) for $1,500 and (2) for $1,000 each for students enrolled in medical field courses and maintaining a high GPA.

Expenses $14,000
Support Mammoth Hospital Cancer Outreach Program for local resident travel expenses to treatment facilities outside Eastern Sierra. Advertise Blood Drive In Association with Mammoth Hospital.

Expenses $8,757
Provide High School seniors with achievement awards of $125 to $250 each.

Expenses $5,100
Membership appreciation officer installation, banguets, and newsletters. Also service awards are presented related to the approximately 10,000 plus hours donated by the volunteers.

Expenses $1,493
Co-Sponsor with Mammoth Community Hospital Community Health Programs. Rhiannons Kids Fund to provide financial support to families who must take their child out of Mammoth Lakes to access needed medical services.

Expenses $500
Baby Welcome Program, provided 100 infant onesies for new borns.

As filed on the 2024 return.

Officers and directors · 2024

As listed in Part VII of the 2024 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

Judy Bornfeld

Immed Past President

Total calculated

$0

Hours/week

1
Jan McPherson

Parlimentarian

Total calculated

$0

Hours/week

1
Vicki Mobley

Member at Large

Total calculated

$0

Hours/week

1
Gail Miller

Member at Large

Total calculated

$0

Hours/week

1
Michael Bornfeld

Member at Large

Total calculated

$0

Hours/week

1
Gardiner Miller

Member at Large

Total calculated

$0

Hours/week

1
Lorrie Gould

Vice President

Total calculated

$0

Hours/week

8
Joanne Hunt

Secretary

Total calculated

$0

Hours/week

8
Diane Beglau

Treasurer

Total calculated

$0

Hours/week

8
Karen Curry

President

Total calculated

$0

Hours/week

12

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. Earlier years are each on their own filing page.

Filings

2024

Revenue

$428,491

Expenses

$411,774

Contributions

$425,098

Grants paid

$249,429
2023

Revenue

$475,962

Expenses

$492,980

Contributions

$472,329

Grants paid

$340,502
2022

Revenue

$383,409

Expenses

$396,073

Contributions

$381,046

Grants paid

$186,704

Tax year	Revenue	Expenses	Contributions	Grants paid
2024	$428,491	$411,774	$425,098	$249,429
2023	$475,962	$492,980	$472,329	$340,502
2022	$383,409	$396,073	$381,046	$186,704

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

2021 · 990

Revenue

$309,629

Expenses

$277,932

Assets (EOY)

$1,788,646
2020 · 990

Revenue

$238,005

Expenses

$322,366

Assets (EOY)

$1,756,949
2019 · 990

Revenue

$288,613

Expenses

$383,047

Assets (EOY)

$1,841,310
2018 · 990

Revenue

$337,656

Expenses

$406,013

Assets (EOY)

$1,935,744
2017 · 990

Revenue

$353,134

Expenses

$376,886

Assets (EOY)

$2,004,101
2017 · 990

Revenue

$353,134

Expenses

$376,886

Assets (EOY)

$2,004,101
2016 · 990

Revenue

$313,479

Expenses

$339,614

Assets (EOY)

$2,027,853
2016 · 990

Revenue

$311,380

Expenses

$339,625

Assets (EOY)

$2,027,842
2015 · 990

Revenue

$304,901

Expenses

$365,671

Assets (EOY)

$2,053,988
2014 · 990

Revenue

$300,812

Expenses

$351,787

Assets (EOY)

$2,118,252

Tax year	Form	Revenue	Expenses	Assets (EOY)
2021	990	$309,629	$277,932	$1,788,646
2020	990	$238,005	$322,366	$1,756,949
2019	990	$288,613	$383,047	$1,841,310
2018	990	$337,656	$406,013	$1,935,744
2017	990	$353,134	$376,886	$2,004,101
2017	990	$353,134	$376,886	$2,004,101
2016	990	$313,479	$339,614	$2,027,853
2016	990	$311,380	$339,625	$2,027,842
2015	990	$304,901	$365,671	$2,053,988
2014	990	$300,812	$351,787	$2,118,252

Nonprofiteer parses Forms 990, 990-EZ and 990-PF, in a window of recent tax years. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all. Showing the 10 most recent; the API carries the rest.

Grants made

Southern Mono Hospital

$319,102

2023 Equipment Education & Prgrams
Southern Mono Hospital

$230,329

2024 Equipment Education & Prgrams
Southern Mono Hospital

$166,754

2022 Equipment Education & Programs

Where these grants went next →

Grants received

No itemized grant names this organization as a recipient. Only grants over $5,000 are itemized, and only by filers of the full Form 990.

Related organizations

From Schedule R Part II, where a filer lists the tax-exempt organizations it is related to by control. It does not record shared board members or money.

Declared as related by

MAMMOTH HOSPITAL FOUNDATION

On its 2023 return

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 13 October 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 13 October 2026 and read 26 October 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.