Sierra Spine Society

  • Newbury Park, CA
  • Tax exemption issued: June 2019
  • EIN: 83-0821669

Organization summary

Type of Nonprofit

Designated as a Organizations for any of the following purposes: religious, educational, charitable, scientific, literary, testing for public safety, fostering national or international amateur sports competition (as long as it doesn't provide athletic facilities or equipment), or the prevention of cruelty to children or animals.

Category: Medical Research / Neurology, Neuroscience Research (NTEE)

Donations to this organization are tax deductible.

Tax Filings by Year

Form 990 is an information return that most organizations claiming federal tax-exempt status must file yearly with the IRS. Nonprofit Explorer has IRS digitized Form 990 data for filings processed in 2012 and later. Duplicate download links may indicate a resubmission or amendment to this organization's original return. Organizations with gross receipts of less than $50,000 can file the form 990-N postcard filing, which doesn’t include financial details. All Form 990 data is from the IRS.

Fiscal Year Ending Dec.
2025

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$159,320
Expenses
$146,184
Net Income
$13,136
Net Assets
$66,627
Notable Sources of Revenue Percent of Total Revenue
Contributions $145,595
91.4%
Program Services $13,725
8.6%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $66,627
Total Liabilities $0
Net Assets $66,627
Compensation
Key Employees and Officers Compensation Other
Michael Dorsi (President) $0 $0

Document Links

990-EZ
Filed on Aug. 28, 2026

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2024

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$121,540
Expenses
$103,908
Net Income
$17,632
Net Assets
$53,491
Notable Sources of Revenue Percent of Total Revenue
Contributions $99,838
82.1%
Program Services $21,702
17.9%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $53,491
Total Liabilities $0
Net Assets $53,491
Compensation
Key Employees and Officers Compensation Other
Michael Dorsi (President) $0 $0

Document Links

990-EZ
Filed on Nov. 3, 2025

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2023

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$142,400
Expenses
$143,634
Net Income
-$1,234
Net Assets
$35,859
Notable Sources of Revenue Percent of Total Revenue
Contributions $0
Program Services $142,400
100%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $35,859
Total Liabilities $0
Net Assets $35,859
Compensation
Key Employees and Officers Compensation Other
Michael Dorsi (President) $0 $0

Document Links

990-EZ
Filed on Aug. 19, 2024

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2022

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$100,257
Expenses
$84,216
Net Income
$16,041
Net Assets
$37,093
Notable Sources of Revenue Percent of Total Revenue
Contributions $64,307
64.1%
Program Services $35,950
35.9%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $37,093
Total Liabilities $0
Net Assets $37,093
Compensation
Key Employees and Officers Compensation Other
Michael Dorsi (President) $0 $0

Document Links

990-EZ
Filed on Oct. 26, 2023

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2021

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$30,086
Expenses
$21,739
Net Income
$8,347
Net Assets
$21,052
Notable Sources of Revenue Percent of Total Revenue
Contributions $16,824
55.9%
Program Services $13,262
44.1%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $21,052
Total Liabilities $0
Net Assets $21,052
Compensation
Key Employees and Officers Compensation Other
Michael Dorsi (President) $0 $0

Document Links

990-EZ
Filed on June 2, 2022

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2020

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$52,125
Expenses
$43,101
Net Income
$9,024
Net Assets
$12,705
Notable Sources of Revenue Percent of Total Revenue
Contributions $39,975
76.7%
Program Services $12,150
23.3%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $12,705
Total Liabilities $0
Net Assets $12,705
Compensation
Key Employees and Officers Compensation Other
Michael Dorsi (President) $0 $0

Document Links

990-EZ
Filed on Nov. 16, 2021

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2019

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$30,124
Expenses
$27,706
Net Income
$2,418
Net Assets
$3,681
Notable Sources of Revenue Percent of Total Revenue
Contributions $19,924
66.1%
Program Services $10,200
33.9%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $3,681
Total Liabilities $0
Net Assets $3,681
Compensation
Key Employees and Officers Compensation Other
Michael Dorsi (President) $0 $0

Document Links

990-EZ
Filed on Nov. 13, 2020

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2018

Gross receipts
Less than $50,000

Postcard filings do not ask for a specific revenue amount and provide no additional financial details.

Document Links

990-N

Postcard filing for an organization with gross receipts less than $50,000. These filings do not generate a downloadable form.

About This Data

What Is This Data?

Nonprofit Explorer includes summary data for nonprofit tax returns and full Form 990 documents, in both PDF and digital formats.

The summary data contains financial information from tax returns processed by the IRS since the 2012 calendar years, as well as data extracted from digital filings. IRS summary data also includes limited older records. This data release includes only a subset of what can be found in the full Form 990s.

In addition to the raw summary data, we link to PDFs and digital copies of full Form 990 documents wherever possible. This consists of separate releases by the IRS of Form 990 documents processed by the agency, which we update regularly.

We also link to copies of audits for nonprofit organizations that spent $750,000 or more in federal grant money in a single fiscal year since 2016. These audits are copied from the Federal Audit Clearinghouse.

Which Organizations Are Here?

Most organizations that have been recognized as tax exempt by the IRS have to file the Form 990 every year, unless they make less than $200,000 in revenue and have less than $500,000 in assets, in which case they have to file the Form 990-EZ. Organizations making less than $50,000 don’t have to file either form but do have to let the IRS they’re still in business via a Form 990N "e-Postcard," which does not contain financial details. Churches are not required to file Form 990.

Nonprofit Explorer has organizations that are claiming tax exemption in any of the 27 subsections of the 501(c) section of the tax code. Taxable trusts and private foundations that are required to file a form 990PF are also included.

Types of Nonprofits

There are 27 nonprofit designations based on the numbered subsections of section 501(c) of the tax code. See the list »

Get the Data

For those interested in acquiring the original data from the source, here’s where our data comes from:

  • Raw filing data. Includes Employer Identification Numbers and summary financials as structured data.
  • Exempt Organization profiles. Includes organization names, addresses, etc. You can merge this with the raw filing data using EIN numbers.
  • Form 990 documents. Prior to 2017, these documents were obtained and processed by Public.Resource.org and ProPublica.
  • Form 990 documents as XML files. Includes complete filing data (financial details, names of officers, tax schedules, etc.) in machine-readable format. Only available for electronically filed documents. Electronic data released prior to October 2021 is also available through Amazon Web Services.
  • Audits. PDFs of single or program-specific audits for nonprofit organizations that spent $750,000 or more in federal grant money in a single fiscal year. Available for fiscal year 2015 and later.

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About Nonprofit Explorer

Nonprofit Explorer

Browse millions of annual returns filed by tax-exempt organizations with ProPublica’s Nonprofit Explorer. See details like executive compensation, revenue, expenses and more. Search for an organization or a person, or search the full text of filings.

By Andrea Suozzo, Alec Glassford, Ash Ngu and Brandon Roberts.

Design by Jeff Frankl. Additional development by Ken Schwencke, Mike Tigas, and Sisi Wei.

E-file viewer adapted from IRS e-File Viewer by Ben Getson. Code for scraping audit documents adapated from Govwiki.

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