Columbia-Suicide Severity Rating Scale (C-SSRS): Subscales, FDA Guidance, and EHR Integration

The Columbia–Suicide Severity Rating Scale (C-SSRS) is a structured assessment instrument developed by investigators at Columbia University, the University of Pennsylvania, and the University of Pittsburgh (Posner et al., 2011) to quantify the severity and intensity of suicidal ideation and classify suicidal behavior across clinical trials and healthcare settings. Unlike general depression questionnaires such as the PHQ-9—whose ninth item combines passive thoughts of death and self-harm into a single question without assessing intent or plan—the C-SSRS separates passive ideation from active ideation with specific method, intent, and plan, and distinguishes suicidal behavior from non-suicidal self-injurious behavior.

What Is the Columbia-Suicide Severity Rating Scale and How Is It Used in Clinical Research and Healthcare?

Validated initially across three multisite studies involving adolescents and adults (American Journal of Psychiatry, 2011), the full C-SSRS evaluates four distinct constructs across defined recall periods (such as Baseline/Lifetime and Since Last Visit):

1. Severity of Suicidal Ideation Subscale (Levels 1–5)

The Ideation Severity Subscale is a 5-point ordinal scale anchored from passive wish to be dead to active suicidal ideation with a specific plan and intent:

Severity Level	C-SSRS Ideation Category	Construct Definition
Level 1	Wish to be dead	Endorsement of thoughts about wishing to be dead or wishing to go to sleep and not wake up (passive ideation).
Level 2	Non-specific active suicidal thoughts	General, non-specific thoughts of wanting to end one’s life without thoughts of ways to kill oneself or associated intent or plan during the assessment period.
Level 3	Active suicidal ideation with any methods (not plan) without intent to act	Thoughts of suicide and having thought of at least one method during the assessment period, without a specific plan of when, where, or how to carry it out and without intent to act.
Level 4	Active suicidal ideation with some intent to act, without specific plan	Active suicidal thoughts of killing oneself paired with some degree of intent to act on those thoughts, but without a worked-out specific plan.
Level 5	Active suicidal ideation with specific plan and intent	Thoughts of killing oneself with details of plan fully or partially worked out and the individual has some intent to carry it out.

2. Intensity of Ideation Subscale

For the most severe level of ideation endorsed (Levels 1–5), the C-SSRS rates five intensity items, each scored on a 5-point ordinal scale (1 to 5): Frequency, Duration, Controllability, Deterrents (factors stopping the individual from acting), and Reasons for Ideation (e.g., stopping pain vs. getting attention). The five items sum to an Intensity of Ideation score ranging from 2 to 25 (or 0 if no ideation is present).

3. Suicidal Behavior Subscale

The Behavior Subscale classifies behavioral events into four suicidal behavior categories plus one non-suicidal category:

• Actual Attempt: A potentially self-injurious act committed with at least some wish to die as a result of the act (intent does not need to be 100%, and physical injury does not need to occur if intent was present).
• Interrupted Attempt: When the person is interrupted by an outside circumstance from starting the potentially self-injurious act that otherwise would have occurred.
• Aborted Attempt (or Self-Interrupted Attempt): When the person begins to take steps toward making a suicide attempt, but stops themselves before engaging in any self-destructive behavior.
• Preparatory Acts or Behavior: Acts or preparation toward imminently making a suicide attempt (such as assembling a method, writing a suicide note, or giving away valuables).
• Non-Suicidal Self-Injurious Behavior (NSSI): Self-injurious behavior engaged in purely for other reasons (such as relieving internal tension or affect regulation) with zero intent to die. Recording NSSI explicitly prevents false-positive classification of non-suicidal self-harm as a suicide attempt in trial safety databases.

4. Lethality Subscale

For any actual attempt, the C-SSRS evaluates Actual Lethality/Medical Damage on a 6-point ordinal scale ranging from 0 (no physical damage or very minor physical damage) to 5 (death). Whenever Actual Lethality is rated 0, the rater scores Potential Lethality on a 3-point scale (0 = behavior not likely to result in injury; 1 = behavior likely to result in injury but not likely to cause death; 2 = behavior likely to result in death despite available medical care).

What Standards or Regulatory Requirements Govern the Columbia-Suicide Severity Rating Scale?

1. FDA Clinical Trial Safety Guidance and C-CASA Mapping

Under the U.S. Food and Drug Administration (FDA) Center for Drug Evaluation and Research (CDER) 2012 guidance, Suicidal Ideation and Behavior: Prospective Assessment of Occurrence in Clinical Trials, sponsors conducting clinical trials for psychiatric indications—as well as neurologic and non-psychiatric drugs with central nervous system activity or neuropsychiatric safety signals—are expected to perform prospective assessments at baseline and at every scheduled study visit.

Historically, retrospective adjudication of adverse event logs using the Columbia Classification Algorithm of Suicide Assessment (C-CASA) suffered from incomplete narrative descriptions. The FDA guidance designates the C-SSRS as an acceptable prospective instrument because its five ideation levels and four behavior categories map directly one-to-one onto the regulatory C-CASA categories (C-CASA Codes 1–5 for ideation and Codes 6–9 for preparatory actions and attempts), enabling standardized pooled safety analyses of treatment-emergent suicidal ideation and behavior across clinical trial endpoints and statistical analysis plans (SAPs).

2. Hospital Patient Safety Screening (NPSG.15.01.01)

In hospital emergency departments, inpatient psychiatry, and primary care workflows, the abbreviated 6-item C-SSRS Screener (The Columbia Lighthouse Project) is widely used to satisfy The Joint Commission’s National Patient Safety Goal NPSG.15.01.01 (identifying individuals at risk for suicide using an evidence-based screening tool) and to prevent serious reportable events. Items 1–5 screen the five ideation severity levels over the past month, and Item 6 screens lifetime and recent (past 3 months) suicidal behavior to stratify patients into low, moderate, or high risk pathways.

How Does the Columbia-Suicide Severity Rating Scale Integrate With EHR and Health Informatics Workflows?

• LOINC and HL7 FHIR Encoding: The C-SSRS Screener and full-scale items are standardized in LOINC (including LOINC panel code 93373-9 for the Columbia-Suicide Severity Rating Scale Screener). Certified EHRs represent C-SSRS assessments using HL7 FHIR R4 Questionnaire and QuestionnaireResponse resources or discrete Observation entries, triggering automated clinical decision support (CDS) alerts when a patient endorses Level 3–5 ideation or recent behavior (Item 6).
• CDISC SDTM Representation in Clinical Trials: In electronic data capture (EDC) andelectronic clinical outcome assessment (eCOA) platforms, C-SSRS data are mapped into the CDISC SDTM Questionnaires (QS) domain under QSCAT = "C-SSRS" using standardized CDISC C-SSRS controlled terminology for baseline/lifetime, since-last-visit, and screening versions.

Sources

• Posner, K., Brown, G. K., Stanley, B., Brent, D. A., Yershova, K. V., Oquendo, M. A., et al. (2011). The Columbia–Suicide Severity Rating Scale: Initial Validity and Internal Consistency Findings From Three Multisite Studies With Adolescents and Adults. American Journal of Psychiatry, 168(12), 1266–1277. https://pmc.ncbi.nlm.nih.gov/articles/PMC3893686/
• U.S. Food and Drug Administration (FDA), CDER (2012). Guidance for Industry: Suicidal Ideation and Behavior: Prospective Assessment of Occurrence in Clinical Trials. https://www.fda.gov/regulatory-information/search-fda-guidance-documents/suicidal-ideation-and-behavior-prospective-assessment-occurrence-clinical-trials
• The Columbia Lighthouse Project. Columbia-Suicide Severity Rating Scale (C-SSRS) Triage and Clinical Resources. https://cssrs.columbia.edu/