OST

BCBS Prefix OST

Highmark Blue Cross Blue Shield Delaware

Delaware • Medicare Advantage, POS, Traditional Indemnity

Billing essentials

Provider phone
(800) 452-8507
Electronic payer ID
58379
Claims mailing address
P.O. Box 1991, Wilmington, DE 19801-1368
Timely filing limit
180 daysCompare all plans
Prior authorization phone
(800) 452-8507
Provider website
https://www.highmark.com

Coverage under prefix OST

Medicare Advantage

This prefix includes Medicare Advantage coverage. MA plans follow CMS guidelines for timely filing (365 days from date of service), which may differ from the commercial plan's deadline. The payer ID for Medicare Advantage claims may differ from the standard commercial payer ID. Verify before submitting.

POS

This is a Point of Service (POS) prefix. POS plans offer flexibility similar to a PPO but incentivize in-network care through lower cost-sharing. Members designate a primary care physician who can issue referrals for the highest level of benefits. Out-of-network claims are covered but at significantly reduced rates.

Traditional Indemnity

This prefix includes traditional indemnity coverage. Indemnity plans are the oldest form of health insurance and offer maximum provider choice with no network restrictions. Members pay a percentage of charges after meeting their deductible. Reimbursement is based on reasonable and customary rates for the service area.

About Highmark Blue Cross Blue Shield Delaware

Independent licensee of the Blue Cross Blue Shield Association providing coverage in Delaware.