GXK

BCBS Prefix GXK

CareFirst BlueCross BlueShield

Maryland/District of Columbia/Northern Virginia • Medicare Advantage, POS, PPO

Billing essentials

Provider phone
(800) 842-5975
Electronic payer ID
580
Claims mailing address
10455 Mill Run Circle, P.O. Box 825, Owings Mills, MD 21117
Timely filing limit
180 daysCompare all plans
Prior authorization phone
(866) 773-2884

Coverage under prefix GXK

Medicare Advantage

Medicare Advantage (MA) coverage means this member receives their Medicare benefits through a private BCBS plan rather than through original Medicare. MA plans may have different payer IDs and claims addresses than the commercial plan. Check with the payer to confirm the correct submission details for Medicare Advantage claims.

POS

This prefix is linked to a POS plan. Point of Service coverage gives members a choice at the time of service: use the HMO-style in-network benefit with a referral for lower costs, or access out-of-network providers at reduced coverage levels. The billing approach depends on which option the member chooses.

PPO

This is a Preferred Provider Organization (PPO) prefix. PPO plans are the most common BCBS plan type. Members have the freedom to self-refer to specialists. Claims for in-network services are typically processed faster and reimbursed at higher rates than out-of-network claims.

About CareFirst BlueCross BlueShield

Independent licensee of the Blue Cross Blue Shield Association serving Maryland, District of Columbia and Northern Virginia.