Overview: The application is the primary underwriting document — its sections each serve a specific risk-assessment purpose.

When an applicant seeks coverage in a market that still uses medical underwriting, the application is the first and most important document the underwriter reviews. Every section is designed to reveal a different dimension of risk.

Part 1 — Personal Information: Name, date of birth, address, Social Security number, and gender. Age is one of the most significant actuarial rating factors because medical utilization rises with age. Geographic location identifies the local healthcare cost environment. Under ACA-compliant plans, gender cannot be used as a rating factor. Under non-ACA plans, it remains relevant for some products.

Part 2 — Coverage Requested: The plan selected, desired effective date, coverage tier, and listed dependents. This section establishes what the applicant wants and how many lives are to be covered.

Part 3 — Medical History: In markets where medical underwriting is permitted, this is the most consequential section. It asks about current and past illnesses, surgeries, hospitalizations, medications, and chronic conditions. It may also ask about height and weight (for BMI calculation), which correlates with risks like diabetes, sleep apnea, and cardiovascular disease. This section is entirely absent from ACA Marketplace applications because health status cannot influence eligibility or pricing.

Part 4 — Lifestyle and Habits: Tobacco use, alcohol consumption, and high-risk hobbies or occupations. Tobacco use is one of the few health-related factors the ACA permits as a rating variable — insurers may charge tobacco users up to 50% more than non-users in the individual market. Non-ACA plans use a broader range of lifestyle questions to assess behavioral risks.

Part 5 — Other Insurance Coverage: Existing or prior coverage, gaps in coverage, and coordination of benefits information. If an applicant has dual coverage, this section establishes which insurer is primary and which is secondary.

Part 6 — Authorizations and Signatures: The applicant's signature binds them to the truthfulness of the application and grants the insurer legal permission to access medical records, prescription histories, and MIB data. Signing also exposes the applicant to the legal consequences of misrepresentation.

The application's importance cannot be overstated: it is the basis for the entire underwriting decision, and inaccurate or incomplete answers can lead to claim denial or policy rescission years after the policy is issued.