Inventory of Complicated Grief

You suspect your client's grief has crossed from painful-but-adaptive into something more disabling. They can't return to work. They avoid every restaurant they shared with the deceased. Their sleep pattern collapsed four months ago and hasn't recovered. The question isn't whether they're hurting — it's whether the clinical picture warrants a different treatment approach.

The Inventory of Complicated Grief (ICG) gives you an empirically validated answer.

What the ICG Measures

Developed by Holly Prigerson and colleagues, the ICG is a 19-item self-report instrument designed to identify grief reactions severe enough to interfere with daily functioning. Each item targets a specific dimension of grief — intrusive thoughts about the deceased, intense yearning, disbelief about the death, feeling stunned or dazed, anger related to the loss, and difficulty trusting others since the death.

Respondents rate each item on a five-point Likert scale ranging from 0 (never) to 4 (always). Total scores run from 0 to 76. A cutoff score of 25 or higher suggests clinically significant complicated grief and supports a comprehensive clinical assessment; it does not establish PGD by itself.

The ICG differs from general depression screeners in one critical way: it isolates yearning-focused sorrow and loss-specific avoidance from the generalized anhedonia measured by tools like the PHQ-9 or BDI-II. A client can score low on a depression screen and still present with severe complicated grief.

Administering the ICG in Practice

The ICG works as either a paper self-report or a clinician-guided interview. For clients in acute distress, guided administration is preferable — it lets you monitor emotional flooding and pause if needed without invalidating the results.

Timing matters. The assessment timeline places an initial ICG or AAG screen at three to six months post-loss. Re-administer the ICG at defined follow-up intervals to track trajectory. A stable or rising score across follow-ups is a reason to review functioning and treatment fit; structured protocols like Complicated Grief Therapy (CGT) or CBT-G are supported for clinically significant grief presentations.

Document the score, the administration date, and a brief clinical note connecting the result to your treatment plan. Insurance reviewers and licensing boards evaluate whether your treatment decisions were evidence-informed. A documented ICG score at each decision point gives you that paper trail.

ICG vs PG-13-R: Choosing the Right Assessment

The ICG and the Prolonged Grief Disorder-13-Revised (PG-13-R) cover related but distinct clinical territory. The PG-13-R maps directly onto DSM-5-TR diagnostic criteria for Prolonged Grief Disorder (PGD), requiring the temporal threshold (at least 12 months for adults, 6 months for minors), a total symptom score of 30 or above, and confirmed functional impairment. The ICG casts a wider net — it can flag clinically significant complicated grief before the PGD diagnostic window opens.

Use the ICG for screening and treatment monitoring. Use the PG-13-R when you need diagnostic precision, particularly if you're documenting medical necessity for insurance authorization.

Pair either scale with the Brief Grief Questionnaire (BGQ) at initial intake — its five items take under two minutes, and a score of 4 or above indicates that a comprehensive assessment is needed.

When the Score Changes Your Treatment Plan

A score below 25 does not by itself establish clinically significant complicated grief. Continue to assess symptoms, functioning, and the client's clinical course when choosing supportive or structured care.

A score of 25 or above changes the clinical picture. At this threshold, consider structured, manualized protocols: Complicated Grief Therapy (a 16-session model with imaginal and situational exposure), or CBT-G with its emphasis on cognitive restructuring of counterfactual "if-only" thinking. Open-ended supportive therapy alone doesn't have the same evidence base for complicated grief presentations.

When a client reports passive reunion fantasies ("I just want to be with them"), assess suicide risk directly regardless of the ICG score. Differentiate passive yearning from active suicidal planning, document your assessment, and implement a collaborative safety plan using the Stanley-Brown framework if indicated.

Building the ICG into Your Clinical Workflow

The simplest approach: add the ICG to your standard assessment battery alongside your existing depression and anxiety screeners. Score it before the session, document it in your progress note, and let the number inform your clinical reasoning — not replace it.

The Therapist's Grief Counseling Framework includes the complete assessment battery structure alongside treatment-planning templates that integrate ICG scoring directly into your documentation workflow, so the screening-to-intervention pathway is built into your session notes rather than handled as a separate step.