Applicability of Service Encounter Reporting Instructions (SERI) and various behavioral health billing guide webinar and materials

Washington State Health Care Authority sent this bulletin at 02/10/2026 12:09 PM PST

February 10, 2026

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Applicability of Service Encounter Reporting Instructions (SERI) and various behavioral health billing guide webinar and materials

The Health Care Authority (HCA) hosted a webinar on January 13, presenting information about:

The WA state plan
The mental health and substance use billing guides
SERI
General guidance and expectations for behavioral health Medicaid providers

At this time, we do not have another webinar scheduled; however, a recording of this webinar is available on the HCA website in the Training section. A copy of the slides and a quick guide with resources are also available.

We encourage review of these materials and to reach out to HCA if there are any questions and/or feedback.

Visit the SERI website.

About the Health Care Authority (HCA)

Functioning as both the state's largest health care purchaser and its behavioral health authority, the Washington State Health Care Authority (HCA) is a leader in ensuring Washington residents have the opportunity to be as healthy as possible.

There are three pillars of our work: Apple Health (Medicaid); the Public Employees Benefits Board (PEBB) and School Employees Benefits Board (SEBB) programs; and behavioral health and recovery. Under these pillars, HCA purchases health care, including behavioral health treatment for more than 2.7 million Washington residents and provides behavioral health prevention, crisis, and recovery supports to all Washington residents.

Please do not reply directly to this message. For more information, visit the HCA website, where you'll also find contact information.

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Nondiscrimination

The Washington State Health Care Authority (HCA) complies with all applicable federal and Washington state civil rights laws and is committed to providing equal access to our services. Visit HCA’s website to view complete nondiscrimination statements.