Hoarding Disorder (ICD-11: 6B24): Complete Guide for Coding and Diagnosis

1. Introduction

Hoarding disorder represents a complex psychiatric condition that affects millions of people worldwide, characterized by persistent difficulty discarding possessions, regardless of their actual value. This condition goes far beyond simple disorganization or sentimental attachment to objects, manifesting as a pathological inability to dispose of items that results in dangerously congested home environments.

The clinical importance of hoarding disorder has become more evident in recent decades, leading to its classification as an independent diagnostic entity in ICD-11. Previously considered only a symptom of other disorders, the recognition of its unique characteristics and specific treatment patterns justified this reclassification.

The impact on public health is significant and multifaceted. People with hoarding disorder face increased risks of fires, infestations, falls, and social isolation. The condition frequently leads to serious family conflicts, evictions, interventions by health authorities, and in extreme cases, mortality related to unsanitary living conditions.

Correct coding of hoarding disorder is fundamental to various aspects of healthcare. It enables appropriate epidemiological tracking, facilitates research on effective treatments, ensures appropriate reimbursement of mental health services, and guarantees that patients receive evidence-based interventions. Furthermore, accurate documentation aids in care coordination among different professionals and services, including social assistance, mental health, and community services.

2. Correct ICD-11 Code

Code: 6B24

Description: Hoarding disorder

Parent category: Obsessive-compulsive or related disorders

Official definition: Hoarding disorder is characterized by the accumulation of possessions that results in cluttering of living areas to the point of compromising their use or safety. The accumulation occurs due to impulses or repetitive behaviors related to acquiring items, as well as difficulty discarding possessions due to a perceived need to keep items and distress associated with discarding them.

A crucial aspect of diagnosis is that if living areas are uncluttered, this is solely due to intervention by third parties, such as family members, cleaning professionals, or authorities. Accumulation can manifest passively, such as the gradual buildup of flyers, mail, or packaging that arrives naturally, or actively, through excessive acquisition of free items, purchased items, or even stolen items.

Symptoms must result in significant distress or substantial impairment in personal, family, social, educational, occupational, or other important areas of functioning. This classification recognizes the disorder as a distinct condition that requires specific therapeutic approaches differentiated from other obsessive-compulsive disorders.

3. When to Use This Code

Code 6B24 should be applied in specific clinical situations where diagnostic criteria are clearly present:

Scenario 1: Accumulation with severe functional impairment A 58-year-old person lives in an apartment where only small pathways allow movement between rooms. Kitchen, bathroom, and bedrooms are filled with newspapers, magazines, packaging, and various objects accumulated over decades. The person reports intense distress when attempting to discard any item, believing they "may need it in the future." They have been unable to receive visitors for years and face eviction threat. This is a typical case for 6B24 coding.

Scenario 2: Compulsive acquisition with accumulation A 42-year-old patient regularly frequents stores with free products, promotions, and collects discarded items from the street. Their residence is so congested that the family can no longer use the living room, kitchen, or one of the bedrooms. When family members attempt to help organize, the patient experiences extreme anxiety and prevents any discarding. Code 6B24 is appropriate when this pattern causes significant functional impairment.

Scenario 3: Passive accumulation with safety risk An elderly person accumulates mail, newspapers, and packaging that they have not discarded for years. The accumulation has blocked emergency exits, created fire risk, and attracted pests. Health services were contacted after neighbors reported unsanitary conditions. The person demonstrates inability to discard items due to intense emotional distress associated with discarding. Code 6B24 should be used in this context.

Scenario 4: Accumulation with preserved insight but inability to change A 35-year-old professional recognizes that their accumulation is problematic and causes embarrassment, but cannot discard possessions. They have lost relationships due to the condition and face difficulties at work by bringing accumulated objects to the office. Despite insight, the distress when attempting to discard items is paralyzing. This profile justifies the use of code 6B24.

Scenario 5: Recurrent accumulation after forced cleanings A person has had their residence cleaned by family members or authorities on multiple occasions, but quickly reaccumulates items. Each cleaning attempt generates extreme distress, and the accumulation pattern returns within weeks or months. The person does not maintain unobstructed spaces without continuous external intervention. This recurrent timeline clearly indicates code 6B24.

Scenario 6: Accumulation with multiple categories of objects A patient accumulates clothes, books, household utensils, packaging, papers, and various other items with no apparent value. They cannot use bed, table, or other furniture due to clutter. Reports that each object has special meaning or future utility, experiencing panic when considering discarding them. The functional impairment and behavior pattern justify code 6B24.

4. When NOT to Use This Code

It is fundamental to differentiate hoarding disorder from other conditions that may present object accumulation as a secondary feature:

Obsessive-compulsive disorder (6B20): Do not use 6B24 when accumulation results from specific obsessions unrelated to the perceived value of objects. For example, if a person accumulates newspapers exclusively out of fear of accidentally discarding important information related to checking obsessions, the appropriate code would be 6B20. The fundamental difference lies in the nature of underlying concerns.

Neurocognitive disorders: When accumulation emerges following the onset of dementia or another neurocognitive disorder and is clearly related to cognitive decline, use the specific code for the neurocognitive disorder. Accumulation in these cases typically presents a different pattern and is associated with other cognitive deficits.

Major depressive episode: Avoid using 6B24 when accumulation is a direct result of apathy, lack of energy, and lack of motivation characteristic of depression, without the presence of specific difficulty discarding objects or active acquisition. In these cases, accumulation typically improves with treatment of depression.

Schizotypal personality disorder: When accumulation occurs in the context of bizarre beliefs or magical thinking characteristic of psychotic or schizotypal disorders, and is not primarily related to attachment to objects, consider the code for the primary disorder.

Normative collecting: Do not code as 6B24 cases of organized collecting, even if extensive, where items are systematically organized, properly displayed, and do not compromise the functionality of living spaces. Typical collectors maintain their spaces functional and safe.

Socioeconomic limitations: Situations where accumulation results primarily from poverty, lack of access to garbage collection services, or inadequate housing conditions should not be coded as 6B24, unless there is clearly a psychopathological component of difficulty discarding associated with emotional distress.

5. Step-by-Step Coding Process

Step 1: Assess diagnostic criteria

Diagnostic confirmation requires systematic evaluation of multiple criteria. First, objectively document the degree of clutter using validated scales such as the Clutter Image Rating Scale, which presents photographs of environments with different levels of congestion. Assess each main room of the residence.

Investigate the nature of the difficulty in discarding through detailed clinical interview. Ask about specific thoughts and emotions that arise when the person considers discarding objects. Identify whether there are beliefs about future need, exaggerated sentimental value, or responsibility in preserving items.

Determine whether there are excessive acquisition behaviors, whether through shopping, collecting free items, or other forms. Quantify the frequency and intensity of these behaviors. Assess whether the person can resist impulses to acquire new items.

Document the specific functional impact: areas of the house that cannot be used for their original purpose, identified safety risks, impairments in relationships, occupational functioning, or other areas. Obtain collateral information from family members when possible, as people with hoarding disorder frequently minimize severity.

Step 2: Verify specifiers

Assess the severity of the disorder considering the degree of clutter, level of functional impairment, and health and safety risks. Mild cases may involve clutter that begins to limit the use of some spaces, while severe cases present imminent safety risks with blocked exits, fire risk, or unsanitary conditions.

Determine the duration of symptoms. Hoarding disorder typically develops gradually over years or decades, with progressive worsening. Document when the hoarding began to cause significant functional impairment.

Identify the patient's level of insight. Some individuals fully recognize that their behavior is problematic (good insight), while others believe that their hoarding is reasonable and justified (poor or absent insight). This aspect influences therapeutic planning.

Assess whether excessive acquisition is a prominent feature, as this may require additional specific interventions for acquisition impulse control beyond work with discarding.

Step 3: Differentiate from other codes

6B20 - Obsessive-compulsive disorder: The fundamental difference lies in the nature of the concerns. In OCD, hoarding generally relates to specific obsessions (contamination, checking, intrusive thoughts) and not to the perceived value of the objects themselves. People with OCD may hoard out of fear of accidentally discarding something important, while in hoarding disorder, the attachment is to the objects themselves.

6B21 - Body dysmorphic disorder: This condition involves excessive concern with perceived defects in physical appearance. Although there may be repetitive behaviors, there is no relationship with object hoarding. The differentiation is generally clear, as the central concerns are completely distinct.

6B22 - Olfactory reference disorder: Characterized by persistent concern about emitting offensive body odor. It does not present overlap with hoarding behaviors. The differentiation is based on a completely different symptom focus.

Also check differential diagnoses outside the category of obsessive-compulsive disorders, including neurocognitive, depressive, and psychotic disorders, as described previously.

Step 4: Required documentation

Adequate documentation should include:

Mandatory checklist:

Detailed description of the degree of clutter in each room
Specific assessment of safety risks (blocked exits, fire risk, infestations)
Documentation of difficulty in discarding and associated emotions/thoughts
Record of acquisition behaviors, if present
Quantification of functional impairment across multiple domains
Duration of symptoms and temporal course
Patient's level of insight
Previous treatment or cleaning attempts
Collateral information from family members or other sources
Assessment of psychiatric comorbidities
Exclusion of other medical or psychiatric conditions that better explain the symptoms

Photographs of the environments, when consented to by the patient, can be extremely useful for objective documentation and monitoring of therapeutic progress.

6. Complete Practical Example

Clinical Case

Maria, 52 years old, retired teacher, was referred by social services after neighbors reported concerning conditions in her residence. During the initial evaluation, Maria reports that "I've always had difficulty throwing things away," but the problem intensified over the last ten years, especially after her mother's death.

During the home visit, it is observed that the living room is completely inaccessible, filled with newspapers, magazines, correspondence, clothing, and various objects stacked from floor to ceiling. The kitchen has only a small usable space at the stove, with the sink inaccessible due to piles of utensils, packaging, and plastic containers. The bedroom has a narrow pathway from the door to the bed, which is partially covered by clothing and books. The bathroom is the only relatively functional space, although hygiene products and towels are accumulated in excessive quantities.

Maria explains that each item has "potential value" or "could be useful someday." She mentions that magazines contain recipes she intends to try, clothing that no longer fits can be altered, and plastic containers "are useful for organization." When questioned about discarding some items, she demonstrates visible anxiety, arguing that it would be "wasteful" and that she would feel "guilty and distressed."

She reports that adult children attempted to help organize the house on two occasions, resulting in intense conflicts. After these attempts, Maria quickly reaccumulated items. Currently, children rarely visit due to the condition of the residence. Maria expresses loneliness and embarrassment, but feels unable to change the pattern.

Beyond passive accumulation, Maria regularly attends community donations and sales, acquiring items that "are in good condition" even without need. She estimates bringing "some things" home weekly.

Social services reported risk of pest infestation and safety concerns due to blocked exits. Maria acknowledges that the situation is problematic, but feels paralyzed to act.

Coding Step by Step

Criteria analysis:

Accumulation with clutter: Present. Multiple rooms compromised in their functionality and safety.
Difficulty discarding: Clearly documented, with emotional distress (anxiety, guilt) associated with discarding.
Perceived need to keep items: Present through beliefs about future value and potential utility of objects.
Active and/or passive accumulation: Both present. Passive accumulation of correspondence and newspapers, in addition to active acquisition at donations and sales.
Third-party intervention: Family attempts to organize were necessary, but without sustained success.
Significant functional impairment: Documented in multiple areas: use of residence, family relationships, social isolation, safety risks.

Code selected: 6B24 - Hoarding disorder

Complete justification:

Maria presents all essential diagnostic criteria for hoarding disorder. The severe clutter compromises the safe use of her residence, with documented safety risks. The persistent difficulty in discarding objects is clearly associated with beliefs about the value and utility of items, accompanied by significant emotional distress when considering discarding.

The pattern includes both passive accumulation and active excessive acquisition behaviors. Family intervention attempts did not result in sustained improvement, indicating that decluttering does not occur without external intervention. Functional impairment is evident in social isolation, family conflicts, and health and safety risks.

The absence of symptoms suggesting other primary conditions (typical OCD obsessions, cognitive decline, psychotic symptoms, or current major depressive episode) reinforces the diagnosis of hoarding disorder as the primary condition.

Applicable complementary codes:

Assess the need for additional codes to document:

Psychiatric comorbidities if present (anxiety, depression)
Medical conditions related to environmental risks
Codes for factors influencing health status related to inadequate housing conditions

7. Related Codes and Differentiation

Within the Same Category

6B20: Obsessive-compulsive disorder

When to use 6B20 vs. 6B24: Use 6B20 when intrusive obsessions and ritualized compulsions are the central features. In OCD, if hoarding occurs, it typically relates to specific obsessions (fear of contamination, need for symmetry, concerns about excessive responsibility) and not to attachment or perceived value of the objects themselves.

Main difference: In OCD, hoarding is secondary to obsessions and serves to neutralize anxiety related to those obsessions. In hoarding disorder (6B24), the focus is on the perceived value of objects, difficulty discarding them, and specific distress related to discarding, independent of other obsessions.

6B21: Body dysmorphic disorder

When to use 6B21 vs. 6B24: Code 6B21 is appropriate when the central concern involves perceived defects in physical appearance, with repetitive behaviors focused on checking, camouflaging, or correcting these perceived defects.

Main difference: Body dysmorphic disorder does not present with hoarding characteristics. Concerns are exclusively related to physical appearance. The differentiation is clear, as the symptom domains are completely distinct.

6B22: Olfactory reference disorder

When to use 6B22 vs. 6B24: Use 6B22 when persistent concern involves emitting offensive body odor, with repetitive behaviors of checking, excessive cleaning, or avoidance of social situations due to these concerns.

Main difference: There is no symptom overlap with hoarding disorder. The focus in olfactory reference disorder is on olfactory concerns and related behaviors, without involvement of object hoarding.

Important Differential Diagnoses

Neurocognitive disorders: Hoarding can emerge in dementias, especially frontotemporal dementia. It is differentiated by the presence of progressive cognitive decline across multiple domains, typically later age of onset, and often a different hoarding pattern (accumulation of specific items, such as food).

Depressive disorder: Apathy and lack of energy in depression can lead to passive accumulation of objects. It is differentiated by the absence of specific difficulty in discarding objects when energy is present and by improvement in hoarding with treatment of depression.

Obsessive-compulsive personality disorder: Although perfectionism and difficulty discarding may be present, the pattern is generally less severe and does not result in clutter that compromises the functionality of spaces.

8. Differences with ICD-10

In ICD-10, there was no specific code for hoarding disorder as an independent diagnostic entity. Cases of hoarding were typically coded within F42 (Obsessive-compulsive disorder) or other related categories, depending on clinical presentation and comorbidities.

The main change in ICD-11 was the recognition of hoarding disorder as a distinct condition with code 6B24. This modification was based on growing evidence that hoarding disorder presents phenomenological, neurobiological, and treatment response characteristics different from classic OCD.

The practical impact of this change is significant. It allows more precise identification of patients with hoarding disorder, facilitating specific research on epidemiology, neurobiology, and effective treatments. Mental health professionals can now diagnose and document the condition more appropriately, avoiding misclassification as OCD when characteristics do not correspond to this diagnosis.

The differentiation also impacts therapeutic planning, as effective treatments for OCD (such as exposure and traditional response prevention) require specific adaptations for hoarding disorder. Specialized interventions include training in categorization, decision-making about discarding, and gradual exposure to object disposal, components not necessarily central to OCD treatment.

Health systems and researchers can now specifically track cases of hoarding disorder, improving understanding of its prevalence, course, and risk factors. This change represents an important advance in psychiatric nosology and in the clinical care of these patients.

9. Frequently Asked Questions

1. How is hoarding disorder diagnosed?

The diagnosis is primarily clinical, based on detailed interview and, ideally, direct observation of the home environment. Mental health professionals use specific criteria including assessment of clutter severity, difficulty discarding objects, acquisition behaviors, and functional impairment. Standardized scales such as the Clutter Image Rating Scale assist in objective quantification. Collateral information from family members is valuable, as patients frequently minimize severity. There are no specific laboratory or imaging tests for diagnosis, although neuropsychological evaluation may be useful to exclude neurocognitive disorders in cases of late onset.

2. Is treatment available in public health systems?

The availability of specialized treatment for hoarding disorder varies considerably among different regions and health systems. Many public mental health services offer cognitive-behavioral therapy, which can be adapted for hoarding disorder. However, access to professionals specifically trained in specialized protocols for hoarding may be limited. Some systems have developed multidisciplinary programs involving mental health, social services, and environmental health. Patients should consult local mental health services for information about availability of specialized treatment in their area.

3. How long does treatment last?

Treatment of hoarding disorder is typically prolonged, generally requiring months to years of intervention. Specialized cognitive-behavioral therapy protocols frequently involve 20-30 initial sessions, with subsequent booster sessions. Progress tends to be gradual, and many patients require continued support to maintain therapeutic gains. Factors influencing duration include severity of clutter, presence of comorbidities, level of insight, family support, and treatment adherence. Some patients may require intermittent interventions throughout life to prevent relapse. Realistic expectation of prolonged treatment is important for patients and family members.

4. Can this code be used in medical certificates?

Yes, code 6B24 can be used in official medical documentation, including certificates, when clinically appropriate. However, professionals should consider issues of confidentiality and stigma. In some contexts, it may be preferable to use more general terminology or codes related to specific symptoms, depending on the purpose of the certificate. For documentation of occupational disability, the functional impact is usually described without necessarily specifying the detailed diagnosis. The decision regarding level of diagnostic specificity in certificates should balance the need for adequate documentation with protection of privacy and minimization of stigma.

5. Do people with hoarding disorder have awareness of the problem?

The level of insight varies considerably. Some patients fully recognize that their behavior is problematic and causes impairment, experiencing significant distress due to this awareness. Others have partial insight, recognizing some problematic aspects but minimizing severity or justifying the hoarding. A subgroup presents poor or absent insight, genuinely believing that their hoarding is reasonable and necessary. The level of insight significantly influences motivation for treatment and prognosis. Patients with better insight generally show greater treatment adherence, although they may experience more emotional distress related to the condition.

6. Is hoarding disorder hereditary?

Family studies suggest a significant genetic component, with higher rates of hoarding disorder among first-degree relatives of affected individuals. Twin research indicates substantial heritability. However, environmental factors are also important, including experiences of loss, material deprivation, family modeling of hoarding behaviors, and stressful life events. The condition likely results from complex interaction between genetic vulnerability and environmental factors. Having a family member with hoarding disorder increases risk, but does not inevitably determine development of the condition.

7. Can children present with hoarding disorder?

Although hoarding behaviors may be observed in children and adolescents, formal diagnosis is generally reserved for adults, as some attachment to objects is normative in child development. When hoarding behaviors in young people cause significant functional impairment, are persistent, and do not respond to appropriate parental interventions, specialized evaluation is indicated. Early intervention may be beneficial, as hoarding disorder typically has a chronic course when untreated. Professionals should carefully differentiate developmentally appropriate behaviors from pathological patterns that warrant intervention.

8. What is the difference between hoarding and collecting?

Collectors systematically organize their items, frequently display them with pride, maintain their spaces functional and safe, and experience pleasure with their collections. In hoarding disorder, objects are disorganized, cause clutter that compromises space functionality, create safety risks, and frequently generate distress and embarrassment. Collectors can describe their collections and their organization in detail, whereas people with hoarding disorder frequently cannot locate specific items or adequately justify why each object should be kept. The distinction is based primarily on degree of organization, functional impact, and associated distress.

Conclusion:

Code 6B24 for hoarding disorder in ICD-11 represents an important advance in recognition of this debilitating condition as a distinct diagnostic entity. Precise coding facilitates appropriate patient identification, adequate therapeutic planning, specific research, and allocation of health resources. Professionals should familiarize themselves with specific diagnostic criteria, differentiation of related conditions, and appropriate documentation to optimize care of these complex patients.

External References

This article was prepared based on reliable scientific sources:

References verified on 2026-02-02

Hoarding Disorder

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