16.1 Health Underwriting and Risk Selection

What Underwriting Accomplishes

Underwriting is the process of evaluating an applicant's risk, deciding whether to accept it, and setting the premium that fairly reflects that risk. In health insurance the underwriter must protect the risk pool so that premiums collected match expected claims plus expenses and a margin.

The central problem underwriting solves is adverse selection: the tendency of people who expect to file claims to buy more insurance than healthier people. If an insurer cannot screen or price for this, sicker applicants concentrate in the pool, claims exceed premiums, rates rise, healthier insureds leave, and the pool spirals. Sound risk selection keeps the pool balanced.

Underwriting also enforces the law of large numbers — the larger and more homogeneous the pool, the more predictable aggregate claims become. By grouping applicants with similar expected loss into the same rate class, the underwriter makes the insurer's pricing actuarially sound and treats insureds equitably, since each pays a premium proportional to the risk they bring.

Sources of Underwriting Information

Underwriters gather facts from several independent sources and reconcile them. No single source is conclusive.

The insurer pays for any exam or report it orders. The MIB exists to deter fraud, not to make the underwriting decision by itself.

Risk Classification

After gathering information, the underwriter assigns a class:

• Preferred – better-than-average health, lowest premium
• Standard – average risk, normal rates
• Substandard (rated) – higher-than-average risk, extra premium
• Declined – risk too great to insure at any price

Substandard applicants are not simply rejected; they are charged additional premium so the pool stays balanced. Two methods are tested heavily:

1. Table rating – expresses extra mortality/morbidity as a percentage above standard. Each table (often Table 1 through Table 16, or A–P) adds roughly 25% of the standard premium. Table 4 means about 100% extra, i.e., double the standard rate.
2. Flat extra – adds a fixed dollar amount per $1,000 of coverage for a specific, often temporary, hazard (for example a dangerous hobby). A temporary flat extra is removed when the hazard ends; a permanent flat extra continues for the life of the policy.

Worked Example: Table Rating

Assume a standard annual premium of $1,200 and the applicant is rated Table 4, where each table adds 25%.

• Extra percentage = 4 tables × 25% = 100%
• Extra premium = $1,200 × 100% = $1,200
• Total annual premium = $1,200 + $1,200 = $2,400

Now add a permanent flat extra of $5 per $1,000 on a $50,000 policy:

• Flat extra = ($50,000 ÷ $1,000) × $5 = $250
• Final premium = $2,400 + $250 = $2,650

Note the order: the table rating scales the base premium, while the flat extra is added afterward as a separate dollar charge.

Field Underwriting and Selection of Risk

The producer performs field underwriting: completing the application accurately, recording all material information, and screening out clearly uninsurable or fraudulent applications before they reach the home office. Good field underwriting lowers the insurer's expense and protects the loss ratio.

Underwriters must also follow fair-discrimination rules: they may classify by genuine, actuarially supported risk factors (age, tobacco use, occupation hazard, health history) but may not decline or rate based on prohibited categories such as race or national origin. Distinguishing permissible risk classification from unfair discrimination is a frequent exam point.

STOLI, Insurable Interest, and Exclusion Riders

Underwriters also confirm insurable interest exists at the time of application — the policyowner must suffer a genuine loss from the insured's death or illness. Stranger-originated arrangements (STOLI), where an investor with no insurable interest induces a person to take out coverage, are prohibited and a red flag in underwriting.

When a specific impairment is acceptable everywhere except for one condition, the underwriter may attach an exclusion rider (impairment rider) that removes coverage for losses arising from that named condition, allowing an otherwise insurable applicant to obtain a policy at standard rates for everything else.

Morbidity, Persistency, and the Loss Ratio

Health underwriting is built on morbidity — the expected rate of sickness or disability in a group — rather than mortality alone. Accurate morbidity assumptions let the insurer set rates that cover claims.

Two measures show whether underwriting is working. Persistency is the rate at which policies stay in force; poor risk selection often produces early lapses and surrenders. The loss ratio (incurred claims ÷ earned premium) reveals whether the pool is priced correctly: a ratio well above the insurer's target signals adverse selection or lax field underwriting that must be corrected.