Fax Number Lookup for US Organizations
Look up and search fax numbers for government agencies, doctors and hospitals, insurance companies, and businesses across the US — including reverse fax number lookup and lookup by name.
Always verify before you send. Fax numbers change and can vary by department or region. We work to keep this directory accurate, but it may be outdated or incorrect — always confirm the number directly with the organization (or on the official IRS/agency website) before sending, especially for sensitive documents. FaxFlow is not affiliated with these organizations.
Most Requested Fax Numbers
Frequently used fax numbers for common services
Medicare Part D Prior Authorization
PopularFax Number
800-693-5288
Hours
24/7
Prior authorization requests for Part D medications
Social Security Administration
PopularFax Number
833-515-0516
Hours
Mon-Fri 9am-4pm EST
Disability and benefit applications
United Healthcare Prior Auth
PopularFax Number
888-950-1059
Hours
24/7
Prior authorization requests
U.S. Dept. of Veterans Affairs — Claims Intake Center
PopularFax Number
844-531-7818
Hours
24/7
Toll-free fax for VA disability compensation claims (domestic claimants). Put your file/claim number on every page.
CVS Caremark — Pharmacy Prior Auth (Commercial)
PopularFax Number
888-836-0730
Hours
24/7
Non-Medicare/commercial pharmacy prior-authorization intake. Separate lines: Medicare Part D 855-633-7673, Medicaid 866-255-7569. Plan/region lines may differ.
Complete Fax Directory
37 fax numbers found
Double-check the number before sending. Fax numbers change and can vary by department or region, and some agencies no longer accept faxed documents. Confirm the number on the official IRS/agency website before sending sensitive documents. FaxFlow is not affiliated with these organizations.
IRS Form 2553 (S-Corp Election)
S-Corporation election — routed by state: 855-887-7734 (eastern, Kansas City) or 855-214-7520 (western, Ogden). Full state list at /irs/form-2553.
Numbers change and can vary by department or region — always confirm with the organization before sending.
IRS Form 2848/8821 (POA/TIA)
Power of Attorney / Tax Information Authorization (CAF Unit) — routed by state: 855-214-7519 (eastern) / 855-214-7522 (western) / 855-772-3156 (international). Full state list at /irs/form-2848.
Numbers change and can vary by department or region — always confirm with the organization before sending.
IRS Form 3911 (Missing Refund)
Refund trace — routed to 8 regional IRS centers by your state. Find your number at /irs/form-3911.
Numbers change and can vary by department or region — always confirm with the organization before sending.
IRS Form 14039 (Identity Theft)
Identity Theft Affidavit
Numbers change and can vary by department or region — always confirm with the organization before sending.
Medicare Part D Prior Authorization
Prior authorization requests for Part D medications
Numbers change and can vary by department or region — always confirm with the organization before sending.
CMS (Centers for Medicare & Medicaid)
General correspondence
Numbers change and can vary by department or region — always confirm with the organization before sending.
HIPAA Complaint Office
File HIPAA violations
Numbers change and can vary by department or region — always confirm with the organization before sending.
CDC Immunization Records
Vaccination record requests
Numbers change and can vary by department or region — always confirm with the organization before sending.
Social Security Administration
Disability and benefit applications
Numbers change and can vary by department or region — always confirm with the organization before sending.
Department of Labor - FMLA
Family Medical Leave Act forms
Numbers change and can vary by department or region — always confirm with the organization before sending.
Small Business Administration
SBA loan applications
Numbers change and can vary by department or region — always confirm with the organization before sending.
United Healthcare Prior Auth
Prior authorization requests
Numbers change and can vary by department or region — always confirm with the organization before sending.
Blue Cross Blue Shield Federal
Federal employee program
Numbers change and can vary by department or region — always confirm with the organization before sending.
Aetna Prior Authorization
Medical prior authorizations
Numbers change and can vary by department or region — always confirm with the organization before sending.
Cigna Precertification (Prior Auth)
Medical precertification / prior authorization intake. Pharmacy and plan-specific lines may differ.
Numbers change and can vary by department or region — always confirm with the organization before sending.
Humana Pharmacy Prior Auth
Pharmacy prior authorizations
Numbers change and can vary by department or region — always confirm with the organization before sending.
US Bankruptcy Court (SDNY)
Southern District of New York
Numbers change and can vary by department or region — always confirm with the organization before sending.
US District Court (Central CA)
Central District of California
Numbers change and can vary by department or region — always confirm with the organization before sending.
Dun & Bradstreet
D-U-N-S Number applications
Numbers change and can vary by department or region — always confirm with the organization before sending.
Better Business Bureau
Complaint submissions
Numbers change and can vary by department or region — always confirm with the organization before sending.
FCC Complaints
Communications complaints
Numbers change and can vary by department or region — always confirm with the organization before sending.
OSHA Whistleblower
Safety violation reports
Numbers change and can vary by department or region — always confirm with the organization before sending.
U.S. Dept. of Veterans Affairs — Claims Intake Center
Toll-free fax for VA disability compensation claims (domestic claimants). Put your file/claim number on every page.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
U.S. Dept. of Veterans Affairs — Claims Intake (foreign claimants)
VA Claims Intake Center fax for foreign/overseas claimants submitting disability compensation claims.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
Federal Student Aid — Public Service Loan Forgiveness (PSLF)
Toll-free fax for PSLF and Direct Loan documents, processed by MOHELA (the Dept. of Education's PSLF servicer). You can also upload at StudentAid.gov.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
FEMA — Individual Assistance (applications, appeals & documents)
Toll-free fax for FEMA disaster Individuals & Households Program documents and appeals. Write your FEMA application number and disaster number on every page.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
California EDD — Work Opportunity Tax Credit (WOTC) Center
EDD fax for WOTC supporting documentation ONLY. Do NOT fax Disability Insurance or Paid Family Leave documents here.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
New York State Dept. of Labor — Unemployment Insurance
Fax for general NY unemployment insurance correspondence. Put your Social Security number in the top-right corner of every page.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
CVS Caremark — Pharmacy Prior Auth (Commercial)
Non-Medicare/commercial pharmacy prior-authorization intake. Separate lines: Medicare Part D 855-633-7673, Medicaid 866-255-7569. Plan/region lines may differ.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
CVS Caremark — Pharmacy Prior Auth (Medicare Part D)
Medicare Part D pharmacy prior-authorization intake. Plan/region lines may differ.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
OptumRx — Pharmacy Prior Auth
General (non-urgent) pharmacy prior-authorization fax. OptumRx is migrating to ePA/CoverMyMeds and retiring many fax lines — confirm it's still active for your plan.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
Express Scripts — Medicare Part D Prior Auth / Coverage Determination
Medicare Part D coverage-determination / prior-authorization fax (Attn: Medicare Reviews). Commercial/employer plan lines differ.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
WellCare — Medical Drug (Part B) Prior Auth
National medical (Part B) drug prior-authorization intake. Pharmacy/Part D and state medical-service lines differ.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
Oscar Health — Medical Prior Auth
Medical prior-authorization request fax (non-CA/FL form). CA/FL and Cigna+Oscar lines may differ.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
TRICARE East (Humana Military) — Medical/Surgical Prior Auth
Non-urgent medical/surgical referral & prior-authorization fax for TRICARE East. Mental-health uses 877-378-2316; TRICARE West differs.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
U.S. SEC — Investor Complaints (OIEA)
Office of Investor Education & Advocacy — complaints about brokers, advisers, and funds. Online (sec.gov) and mail also accepted.
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
California DMV — Public Records Requests
Legal Affairs Division — Public Records Act / Information Practices Act requests only (not general DMV transactions).
Verified · official source ↗Numbers change and can vary by department or region — always confirm with the organization before sending.
How to Find Any Fax Number
Tips and resources for locating fax numbers by category
Find IRS Fax Numbers
Each IRS form has a specific fax number based on your state and the processing center. Always verify on the official form instructions before sending.
- Form 2553 — S-Corp Election
- Form 2848 — Power of Attorney
- Form 3911 — Missing Refund
- Form 8821 — Tax Info Authorization
Fax Number Lookup for Doctors & Hospitals
Doing a fax number lookup for doctors, clinics, or a hospital? Medical offices typically list fax numbers on their websites, patient portals, or business cards. You can also:
- Call the office and ask for their fax number
- Check the patient portal or after-visit summary
- Look on prescription labels or referral forms
- Search online healthcare provider directories
Filter the directory above by Healthcare to see common medical fax lines — Medicare Part D, CMS, the CDC, and insurer prior-authorization numbers. Always confirm the number with the office before faxing patient information.
Find Government Fax Numbers
Government agencies publish fax numbers on official .gov websites. Look for the "Contact Us" page or specific form instructions.
- Social Security Administration
- US Passport Agency
- USCIS (Immigration)
- Department of Labor
Find Business Fax Numbers
Most businesses list fax numbers on their websites or Google Business profiles. Try these methods:
- Check the company's "Contact Us" page
- Search Google for the company name + fax number
- Call the main phone number and ask
- Check industry-specific directories
Once you find the number, send your fax instantly with FaxFlow — no fax machine needed.
Send Fax NowFax Number Lookup Guides & Tools
Explore focused guides and tools for finding, identifying, and verifying fax numbers.
Reverse Fax Lookup
Whose fax number is this? How reverse lookup works and how to identify who a number belongs to.
Lookup by Name
Find a fax number for a business when you know the name, with proven step-by-step methods.
Business Fax Lookup
Find fax numbers for doctors, pharmacies, providers, and offices by business type.
Fax Number Checker
Verify and validate a US or international fax number format before you send.
Fax Numbers Directory
Browse our curated directory of US organization fax numbers, organized by category.
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