Important Medicare phone numbers

Acumentra Health is a nonprofit healthcare Quality Improvement Organization. We contract with Medicare to improve health care for Medicare beneficiaries. All of our services to Medicare beneficiaries are free.

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If you have questions or complaints—call these numbers. The phone numbers and website addresses listed below do not include all agencies handling Medicare issues. They are the numbers most often used by Medicare beneficiaries. Phone numbers with a prefix of 800, 866, 877, or 888 are toll-free calls.

National Medicare Helpline

24 hours a day, 7 days a week, in English and Spanish

1-800-MEDICARE (1-800-633-4227)
TTY 1-877-486-2048

Medicare website

Medicare Billing Questions, Parts A & B:
Medicare Administrative Contractor (MAC)

1-800-MEDICARE (1-800-633-4227)
TTY 1-877-486-2048

Part A

  • Get answers to billing questions for inpatient care in hospitals and
    skilled nursing facilities, hospice care, and some home health care
  • Pays Part B bills for outpatient hospital Services

Part B

  • Get answers to billing questions for doctors’ bills and other services
    not covered by Part A

Medicare Coordinator of Benefits (COB)

TTY 1-800-318-8782

  • Coordinates benefits when Medicare is the secondary payer

Senior Health Insurance Benefits Assistance (SHIBA)

TTY 1-800-735-2900

  • Free assistance with Medicare insurance, Medicare Advantage plans, supplemental insurance (Medigap), and long-term care insurance
  • One-on-one counseling for help comparing insurance policies, understanding Medicare Part D prescription drug coverage, filing claims, and dealing with payment denials or appeals

Oregon Insurance Division—Consumer Protection


  • Report an insurance company or agent complaint
  • Get information to make informed health insurance decisions

Oregon Department of Human Services
Seniors and People with Disabilities Division

TTY 1-800-282-8096

  • Licensing & regulatory agency for long-term care services
  • Skilled nursing facilities
  • In-home services
  • Community-based care facilities
    (such as foster homes, assisted living, residential care)
  • Senior Prescription Drug Assistance Program
  • Qualified Medicare Beneficiaries—program to help pay
    Medicare premiums and deductibles for low-income individuals
  • Meal programs
  • Investigation of suspected Medicare fraud or elder abuse
  • Area Agencies on Aging

Oregon Health Care Regulation & Quality Improvement

971-673-0540 (not toll free)
TTY 1-971-673-0372

  • Licensing & regulatory agency for Oregon hospitals, home health agencies, in-home care agencies, hospice programs, ambulatory surgical centers, rural health clinics, special inpatient care facilities, community mental health centers, end-stage renal disease dialysis facilities, rehabilitation agencies and clinics, comprehensive outpatient rehabilitation facilities, birthing centers, hemodialysis technicians and portable x-ray suppliers.
  • Investigates complaints about health and safety that involve potential violation of applicable state rules or federal regulations in those facilities and agencies

Emergency Medical Services & Trauma Systems

TTY: 971-673-0372

  • Licensing and regulatory agency for systems in Oregon that provide quality emergency care to victims of sudden illness or traumatic injury
  • Investigates complaints about ambulance services

Social Security Administration

TTY 1-800-325-0778

  • Obtain Medicare enrollment and premium information
  • Replace a lost or damaged card

Office for Civil Rights—Health Information Privacy

TDD 1-800-537-7697

  • File a health information privacy complaint

Office of Inspector General Hotline

TTY 1-800-377-4950

Oregon Medical Board

1-877-254-6263 (use if in Oregon, outside Portland area)
  • Licensing body for Oregon physicians, podiatrists, physician assistants, and licensed acupuncturists
  • Investigates complaints about licensed practitioners (listed above)

Oregon Office of the Long-Term Care Ombudsman

TTY 1-866-926-6600

  • Advocates for long-term care residents
  • Investigates and resolves complaints about long-term care facilities

Oregon Health Plan (Medicaid)

TTY 1-800-621-5260

  • Healthcare coverage for individuals with low incomes

*About these listings

The phone numbers and website addresses listed on this page are provided for your convenience and information only; their inclusion does not imply endorsement by Acumentra Health. The links listed on this page will take you to non-Acumentra Health websites. Please note that the statements in Acumentra Health’s Internet privacy policy apply only to the Acumentra Health website. If you wish to know the privacy policy of the site where you are going, contact the webmaster of that site.

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Last updated June 21, 2012