Overview: Underwriters rely on multiple independent information sources to build a complete, accurate risk picture — each source revealing different information.

The application gives the underwriter the applicant's self-reported story. Every other source is used to verify, supplement, and cross-check that story. The combination of sources is what makes underwriting both thorough and defensible.

The Application Itself

As discussed, the application is the primary document. It reveals demographics, lifestyle factors (especially tobacco use), medical history, family history, and occupation. Its key limitation is that it is entirely self-reported — applicants can omit, minimize, or misrepresent information, intentionally or not. Every other source exists, in part, to verify the application.

The Paramedical Exam

A paramedical exam — conducted by a trained nurse or technician at the applicant's home, office, or clinic — provides objective, real-time physiological data. A standard paramedical exam typically includes:

Height and weight (for BMI)
Blood pressure and pulse
Blood draw (for cholesterol, glucose/HbA1c, liver function, kidney function, lipid panel)
Urinalysis (checking for protein, blood, glucose, cotinine/nicotine)
Electrocardiogram (ECG/EKG) for older applicants or larger coverage amounts

The exam serves two important functions: it identifies conditions the applicant may not know they have (undiagnosed diabetes, hypertension) and it verifies claims the applicant made (such as being a non-smoker — a cotinine-positive urine test contradicts that claim). Higher coverage amounts and older applicants typically trigger more extensive testing.

Attending Physician Statements (APS)

An attending physician statement (APS) is a detailed report requested directly from the applicant's treating physician or specialist. Unlike raw medical records, an APS is a structured clinical summary that typically includes:

The exact diagnosis and date of onset
Current treatment plan and medications
Lab results, imaging findings, and specialist consultations
Physician's assessment of disease severity, control, and prognosis
Patient compliance with treatment

The APS is the "gold standard" of medical underwriting information. The medical exam shows what the applicant looks like today; the APS shows the full clinical history and trajectory. Underwriters order an APS when:

A significant condition is disclosed (cancer, heart disease, diabetes, psychiatric illness)
Paramedical exam results are abnormal
Prescription database data is inconsistent with the application
MIB codes flag prior activity that needs clarification
Coverage amounts are very high or the applicant is older

The APS can work in the applicant's favor as well as against them. A paramedical exam may show an elevated blood glucose reading. The APS might clarify that the applicant failed to fast before the draw, and their physician confirms A1c of 5.2% — well within normal. The underwriter can then rate the applicant favorably rather than applying a diabetes rating.

The main disadvantage of the APS is time. Busy physicians' offices may take weeks to complete them, delaying the underwriting decision and frustrating applicants.

Prescription Drug Records

Underwriters access prescription drug databases — such as Milliman IntelliScript or LexisNexis RxHistories — to retrieve a detailed history of the applicant's filled prescriptions, typically covering the past 5–7 years. This is one of the most revealing sources in the underwriting toolkit because:

Medications often indirectly disclose conditions the applicant did not report (insulin → diabetes; beta-blockers + ACE inhibitors → hypertension or heart failure; antipsychotics → severe psychiatric illness)
Dosage trends reveal whether a condition is stable or worsening
Fill frequency reveals medication adherence (filling once a year instead of monthly suggests non-compliance)
Prescriber specialty provides clinical context (an oncologist's prescription carries different implications than a general practitioner's)

A classic example: an applicant checks "no medical conditions" on the application, but the Rx database shows three years of metformin, a statin, and a daily aspirin. This combination suggests uncontrolled diabetes, cardiovascular risk, and preventive cardiac management — conditions the applicant failed to disclose.

These databases are classified as consumer reporting agencies under the Fair Credit Reporting Act (FCRA), which means applicants have the right to request a copy and dispute inaccuracies.

Medical Records

Full medical records — including physician progress notes, diagnostic imaging, pathology reports, operative reports, and discharge summaries — provide the most detailed picture of the applicant's health history. Underwriters request these when an APS alone is insufficient or when the underwriter needs to see raw clinical documentation rather than a physician's summary.

Medical records reveal:

Surgical history and outcomes
Emergency room utilization patterns (repeated ER visits without clear acute cause may suggest unmanaged chronic illness or substance abuse)
Psychiatric treatment history, including hospitalizations
Substance abuse treatment documentation
Patterns suggesting "doctor shopping" or medication-seeking behavior
Unexplained symptoms or ongoing diagnostic workups

The Medical Information Bureau (MIB)

The MIB Group is a not-for-profit, member-owned organization founded in 1902 that functions as an information-sharing network among approximately 430 life and health insurers in the United States and Canada. Think of it as the "credit bureau of the insurance industry."

When an applicant applies for underwritten coverage, the insurer queries the MIB database using the applicant's identifying information. If the applicant has applied for coverage at any MIB member company in the past seven years, there may be a file. That file contains coded alphanumeric entries — not medical records, not full diagnoses — indicating that a significant medical condition, high-risk activity, or adverse finding was previously noted during underwriting. The codes are intentionally vague to protect privacy while alerting subsequent underwriters to investigate further.

Critical rules governing MIB use:

An insurer cannot deny coverage or set premiums based solely on an MIB code. The MIB file is a prompt to investigate, not a final determination.
If a discrepancy is found between the application and the MIB file, the underwriter must independently verify through medical records, APS, or exams.
Applicants have the right to request a free copy of their MIB file annually and dispute any inaccurate entries.
MIB is regulated under the FCRA.

It is important to note: the ACA prohibits medical underwriting for major medical plans. MIB checks are not used in the individual ACA-compliant market. They are most relevant for life insurance, disability insurance, long-term care insurance, and Medigap plans where medical underwriting applies.