Samples / Healthcare / Deep dive / Determination methodology
Deep dive — methodology

How the Category A / B / C determination is derived

Every $499 Snapshot lands on exactly one overall determination. Not a color code, not a health score — a A/B/C determination tied to attestation stance. Here is exactly how it is derived.

The three categories

CategoryMeaningAttestation stance
A No high-severity drift events. No group-differential signal. Baseline vs recent distributions match within threshold. Sufficient for attestation. Signed evidence available on file.
B Medium-severity drift or single-event high-severity without group-differential signal. Aggregate metrics stable. Conditional. Named remediation + re-audit within defined window supports attestation.
C Multiple high-severity drift events + group-differential signal fired. Insufficient. Operator should not represent the AI as compliance-defensible until remediation completes.

The evidence chain

  1. Sensor thresholds active during the audit:
    • Mean-shift threshold: 1.5 standard deviations from baseline
    • Variance-ratio threshold: 1.5x baseline
    • KL-divergence threshold: 0.2
    • Group adverse-impact differential threshold: 12% shift across patient groups
  2. Event classification:
    • Any single-threshold cross → medium-severity event
    • KL-divergence > 1.0 OR group-differential signal → high-severity event
  3. Category assignment:
    • 0 high-severity + 0 group-differential → A
    • 1-2 high-severity, no group-differential signal → B
    • ≥ 3 high-severity or any group-differential signal fired → C

Why this sample lands on C

9 high-severity drift events + Day-89 cross-group differential signal fired (12.4% differential exceeded 12% threshold). Either condition alone is sufficient for C. Both are present. The determination is not marginal.

Why the A/B/C structure matters

Continuous-scale scores (0-100 dashboard, red/yellow/green tri-lights, "health-score" percentages) push operators toward "just above the threshold" gaming behavior. A/B/C determinations force a single stance question:

Would you sign the attestation as-is today? A/B/C answers the question that regulators, boards, and carriers actually ask — instead of the question the vendor's dashboard prefers.

How does this help me?

Knowing your category BEFORE the survey / OCR letter / board deck lands is the whole value of the $499 discipline.

Read: The value of knowing your category first →

$499 Snapshot. 3 business days.

Get your hospital's Category A / B / C determination on your actual AI surface — before someone else's question forces the answer.

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