Medical Billing Company in Maryland | CareFirst Expertise

HealthChoice, Maryland's Medicaid managed care program, launched in 1997 and enrolled roughly 80 percent of the Medicaid population into MCOs within less than a year, one of the fastest rollouts of its kind. Maryland contracts with any MCO that meets state requirements rather than limiting the field to a fixed number, which is why the state's roster includes both national for-profit plans like UnitedHealthcare Community Plan and Amerigroup, and several homegrown Maryland plans like Priority Partners, MedStar Family Choice, and Jai Medical Systems. One structural quirk worth knowing: mental health services are carved out of HealthChoice MCOs entirely and billed fee-for-service through the state's public mental health system, even though substance use disorder treatment stays inside the MCO contract.

On the commercial side, CareFirst BlueCross BlueShield dominates with roughly 55 to 60 percent of Maryland's insured population, serving 3.3 to 3.5 million members across Maryland, Washington, D.C., and Northern Virginia. Kaiser Permanente is a distant second at around 26 percent, but operates a closed-network HMO limited to the Baltimore-D.C. corridor. Aetna exited Maryland's individual marketplace for 2026, and 2023 data showed real variation in how carriers handle claims: CareFirst denied about 17 percent, UnitedHealthcare 32 percent, and Kaiser only 7 percent.