Premium billing software that supports both individual and group health plans uses a single billing engine to generate receivables and payables from enrollment data and rate rules, regardless of whether the member pays directly or an employer group pays on their behalf. The platform configuration, not custom code, determines which business rules, payment methods, and invoice formats apply to each market segment.
This matters because most health plans operate in multiple segments simultaneously: individual on-exchange, individual off-exchange, small group, large group, Medicare Advantage, and sometimes Medigap or voluntary products. A billing system that handles only one segment forces the plan to maintain multiple platforms, multiple data sources, and multiple reconciliation processes.
Why most billing systems fail at both
The challenge is not generating an invoice. It is managing the fundamentally different billing logic that applies to individuals versus groups while keeping all financial data in one system.
Individual billing requires member-level invoicing, diverse payment methods (ACH, credit card, retail cash, check), member self-service portals, and delinquency management tied to individual grace periods. Group billing requires employer-level invoicing, self-billing capabilities, group payment application that cascades to member-level records, and often list billing where the plan generates the invoice based on enrolled members.
Systems built for one market struggle to adapt to the other. Group billing modules bolted onto enrollment platforms rarely handle the complexity of individual direct-bill accounts. Individual billing systems rarely support the employer hierarchy and self-billing workflows that group markets require.
How a unified platform handles both
A purpose-built premium billing platform uses an entity hierarchy flexible enough to accommodate both markets. Individual accounts require only a billable person or family. Group accounts use a sponsor entity with a multi-level structure (Sponsor Group, Sponsor, Site, Department), enabling consolidation at any level.
Both account types are created through automated enrollment interfaces. The same billing engine calculates charges, generates invoices, applies payments, and manages delinquency for both, but configuration determines the specific rules for each segment.
Certifi’s William™ platform establishes entity collections by market segment, each with its own business rules and payment options: Individual On Exchange, Individual Off Exchange, Small Group On Exchange, Small Group Off Exchange, Large Group Off Exchange, Medicare Advantage, and Medigap. All segments run on the same platform instance, sharing a single source of financial truth.
Billing across market boundaries
Real-world billing frequently crosses the boundary between individual and group. A member may have an employer contribution that covers part of their premium, with the remainder individually responsible. ICHRA (Individual Coverage Health Reimbursement Arrangement) scenarios require coordinating employer reimbursements with individual marketplace enrollment.
A platform that supports both markets handles this. A single member’s charges can contain multiple receivable components, each routed to separate invoices and separate entities. One component flows to a group invoice. Another flows to an individual direct bill.
This also supports third-party payor scenarios where a portion of an individual member’s premium is paid by an entity other than the member or their employer.
Group payments that maintain member-level precision
When an employer group submits a single payment covering hundreds of members, the billing system must do two things simultaneously: post the payment to the group account and update the payment status of every underlying member-level transaction.
This is where platforms built only for group billing fail at the individual level. They track group-level financials but cannot report on individual member payment status with precision. Purpose-built platforms cascade group payments to member-level records automatically, enabling accurate paid-through-date reporting to claims systems regardless of whether the payment originated from an individual or a group.
Self-billing and list billing in one platform
Some employer groups self-administer their billing. They report headcount and calculate their own premium amount rather than receiving a list bill from the health plan. Other groups in the same health plan receive a traditional list bill.
A platform supporting both individual and group markets handles self-administered billing alongside list billing without creating parallel processes. Employers enter headcount, volume, and adjusted rate amounts. Defaults carry forward monthly. Retroactive adjustments are supported. Meanwhile, individuals on the same platform receive direct bills calculated from their enrollment and rate data.
The Certifi team has built seven billing platforms over the past 30 years and currently serves some of the largest public and private exchanges in the United States, handling both individual market and employer group billing from a single platform. Named in two 2026 Gartner® Reports, the William platform was purpose-built for this multi-segment complexity.
Learn how Certifi eliminates billing complexity. Request a demo.
Frequently asked questions
Can one billing system really handle individual ACA exchange billing and billing large groups?
Yes. A purpose-built billing platform uses configuration to apply different business rules, grace periods, payment methods, and invoice formats to each segment while maintaining all financial data in a single system. The key is a flexible entity hierarchy and configurable rate rules.
How does a billing platform handle APTC subsidies for individual members within a multi-segment system?
Subsidy amounts are applied as receivable components on the individual member’s account. The platform tracks the federal APTC payment separately from the member’s portion, enabling accurate reconciliation with CMS while the member sees only their net amount due.
What happens when a member moves from individual to group coverage mid-year?
The platform processes the enrollment change, terminates the individual billing account as of the effective date, and begins billing through the group account. Retroactive adjustments to prior periods are handled automatically, crediting the individual account and initiating charges through the group.
Related Resources
- Premium Billing Features & Capabilities
- How Do Health Plans Manage Billing Across Multiple Lines of Business in One Platform?
- ACH, Lockbox, and Premium Billing Payment Methods: What Health Plans Need From Their Billing Platform
