GUO

BCBS Prefix GUO

Premera Blue Cross

Washington • HMO, Medicare Advantage, POS

Billing essentials

Provider phone
(877) 342-5258
Electronic payer ID
00851
Claims mailing address
P.O. Box 91059, Seattle, WA 98111-9159
Timely filing limit
90 daysCompare all plans
Prior authorization phone
(877) 342-5258

Coverage under prefix GUO

HMO

This is a Health Maintenance Organization (HMO) prefix. HMO plans have stricter routing requirements than PPO plans. Members select a PCP who manages their care and issues referrals. Claims for specialist services should include the referral number. Out-of-network claims will typically be denied unless emergency criteria are met.

Medicare Advantage

Medicare Advantage coverage under this prefix means the plan administers Medicare Part A and Part B benefits on behalf of CMS. These claims may have different processing rules than commercial claims, including different prior authorization requirements and appeal timelines. CMS timely filing rules (365 days) typically apply.

POS

POS coverage under this prefix operates on a tiered system. Tier 1 (in-network with referral) provides the highest coverage. Tier 2 (in-network without referral) provides moderate coverage. Tier 3 (out-of-network) provides the lowest coverage. Verify which tier applies before submitting the claim.

About Premera Blue Cross

Independent licensee providing commercial, Medicare and Medicaid plans to Washington members.