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ICD-10 Guide
ICD-10 CodesF31.81

F31.81

Billable

Bipolar II disorder

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 F31.81 is a billable code used to indicate a diagnosis of bipolar ii disorder.

Key Diagnostic Point:

Bipolar II disorder is characterized by a pattern of depressive episodes and hypomanic episodes, but not the full-blown manic episodes that are typical of Bipolar I disorder. Individuals with Bipolar II disorder experience significant mood swings that can affect their daily functioning and quality of life. The depressive episodes can be severe and may lead to significant impairment in social, occupational, or other important areas of functioning. Hypomanic episodes, while less severe than manic episodes, can still lead to increased energy, decreased need for sleep, and heightened creativity or productivity. Diagnosis is typically made based on a thorough clinical assessment, including a detailed history of mood changes and their impact on the individual’s life. Treatment often involves mood stabilizers, psychotherapy, and lifestyle modifications. Due to the nature of the disorder, individuals with Bipolar II disorder are at an increased risk for suicide, making regular risk assessments and monitoring essential in their management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between Bipolar I and Bipolar II disorders
  • Identifying the presence of hypomanic versus manic episodes
  • Documenting the severity and duration of mood episodes
  • Assessing comorbid conditions such as anxiety or substance use disorders

Audit Risk Factors

  • Inadequate documentation of mood episode duration
  • Failure to assess and document suicide risk
  • Misclassification of hypomanic episodes as depressive episodes
  • Lack of comprehensive treatment plans in documentation

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Detailed patient history, mood episode documentation, treatment plans, and risk assessments.

Common Clinical Scenarios

Initial diagnosis, treatment adjustments, and management of comorbid conditions.

Billing Considerations

Regular assessments for suicide risk and the impact of medication on mood stabilization.

Primary Care

Documentation Requirements

Comprehensive patient history, medication management records, and referrals to mental health specialists.

Common Clinical Scenarios

Routine follow-ups for medication management and monitoring of depressive symptoms.

Billing Considerations

Coordination with mental health providers for integrated care.

Coding Guidelines

Inclusion Criteria

Use F31.81 When
  • According to ICD
  • 10 guidelines, F31
  • 81 should be used when a patient has a confirmed diagnosis of Bipolar II disorder, characterized by at least one hypomanic episode and one major depressive episode

Exclusion Criteria

Do NOT use F31.81 When
  • Exclusion criteria include the absence of manic episodes and the presence of other mood disorders

Related ICD-10 Codes

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for follow-up visits for medication management in patients with Bipolar II disorder.

Documentation Requirements

Documentation of patient history, mood assessment, and treatment plan.

Specialty Considerations

Psychiatrists may require more detailed documentation of mood episodes.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of mood disorders, including Bipolar II disorder, which enhances the accuracy of diagnosis and treatment tracking.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of mood disorders, including Bipolar II disorder, which enhances the accuracy of diagnosis and treatment tracking.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of mood disorders, including Bipolar II disorder, which enhances the accuracy of diagnosis and treatment tracking.

Resources

Clinical References

  • •
    National Institute of Mental Health

Coding & Billing References

  • •
    National Institute of Mental Health

Frequently Asked Questions

What is the difference between Bipolar I and Bipolar II disorder?

Bipolar I disorder includes at least one manic episode, while Bipolar II disorder is characterized by at least one hypomanic episode and one major depressive episode without any manic episodes.