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ICD-10 Guide
ICD-10 CodesF31.31

F31.31

Billable

Bipolar disorder, current episode depressed, mild

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

Code Description

ICD-10 F31.31 is a billable code used to indicate a diagnosis of bipolar disorder, current episode depressed, mild.

Key Diagnostic Point:

Bipolar disorder, classified under mood disorders, is characterized by alternating episodes of mania and depression. The current episode of depression is classified as mild, indicating that the symptoms are present but not severe enough to cause significant impairment in social or occupational functioning. Patients may experience low mood, decreased energy, and diminished interest in activities, but they typically retain some ability to function. The diagnosis requires a thorough assessment of the patient's mood history, including the duration and intensity of depressive symptoms, as well as any previous manic episodes. Treatment often involves mood stabilizers, such as lithium or anticonvulsants, and may include psychotherapy. Given the nature of bipolar disorder, there is a heightened risk of suicide, necessitating regular risk assessments and monitoring of the patient's mental state. Accurate coding is essential for appropriate treatment planning and insurance reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between mild, moderate, and severe episodes of depression.
  • Understanding the nuances of bipolar disorder versus unipolar depression.
  • Assessing the patient's history of manic episodes for accurate diagnosis.
  • Documenting the severity and duration of depressive symptoms.

Audit Risk Factors

  • Inadequate documentation of the severity of depressive symptoms.
  • Failure to document the patient's history of manic episodes.
  • Misclassification of the episode as moderate or severe.
  • Lack of regular suicide risk assessments.

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Comprehensive mental health evaluations, including mood assessments and treatment plans.

Common Clinical Scenarios

Patients presenting with depressive symptoms following a manic episode.

Billing Considerations

Regular monitoring for suicidal ideation and medication side effects.

Primary Care

Documentation Requirements

Detailed patient history and mental status examinations.

Common Clinical Scenarios

Patients with a known history of bipolar disorder presenting with depressive symptoms.

Billing Considerations

Coordination with mental health specialists for comprehensive care.

Coding Guidelines

Inclusion Criteria

Use F31.31 When
  • Follow the ICD
  • CM coding guidelines for mood disorders, ensuring accurate documentation of the episode's severity and any relevant comorbidities
  • Include details about the patient's treatment plan and response to therapy

Exclusion Criteria

Do NOT use F31.31 When
No specific exclusions found.

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 disorder.

Documentation Requirements

Document the patient's mood status, medication adherence, and any side effects.

Specialty Considerations

Psychiatrists may require more detailed mental status examinations.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of bipolar disorder, improving the accuracy of diagnoses and treatment plans. This specificity aids in better understanding the patient's condition and tailoring interventions.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of bipolar disorder, improving the accuracy of diagnoses and treatment plans. This specificity aids in better understanding the patient's condition and tailoring interventions.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of bipolar disorder, improving the accuracy of diagnoses and treatment plans. This specificity aids in better understanding the patient's condition and tailoring interventions.

Resources

Clinical References

  • •
    American Psychiatric Association - Diagnostic and Statistical Manual of Mental Disorders

Coding & Billing References

  • •
    American Psychiatric Association - Diagnostic and Statistical Manual of Mental Disorders

Frequently Asked Questions

What is the difference between F31.31 and F31.32?

F31.31 indicates a mild depressive episode in bipolar disorder, while F31.32 indicates a moderate depressive episode. The distinction is based on the severity of symptoms and their impact on functioning.