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ICD-10 Guide
ICD-10 CodesN85.3

N85.3

Billable

Subinvolution of uterus

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/18/2025

Code Description

ICD-10 N85.3 is a billable code used to indicate a diagnosis of subinvolution of uterus.

Key Diagnostic Point:

Subinvolution of the uterus refers to the failure of the uterus to return to its normal size and condition following childbirth. This condition typically occurs in the postpartum period and can lead to complications such as prolonged vaginal bleeding, infection, and uterine atony. The uterus normally involutes, or shrinks, after delivery due to hormonal changes and the expulsion of the placenta. In cases of subinvolution, the uterine muscle fibers do not contract effectively, which can be attributed to retained placental tissue, infection, or other underlying conditions. Clinically, patients may present with symptoms such as abnormal uterine bleeding, pelvic pain, and signs of infection. Diagnosis is often made through clinical examination and imaging studies, such as ultrasound, to assess the size of the uterus and rule out retained products of conception. Management may include medical treatment with uterotonics or surgical intervention if necessary. Understanding this condition is crucial for healthcare providers to prevent complications and ensure proper postpartum care.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between normal postpartum changes and subinvolution
  • Identifying underlying causes such as retained products of conception
  • Variability in clinical presentation among patients
  • Need for imaging studies to confirm diagnosis

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to document imaging studies performed
  • Misdiagnosis due to overlapping symptoms with other conditions
  • Lack of follow-up documentation on treatment outcomes

Specialty Focus

Medical Specialties

Obstetrics and Gynecology

Documentation Requirements

Detailed documentation of postpartum assessments, including uterine size and condition, any interventions performed, and follow-up care.

Common Clinical Scenarios

Postpartum patients presenting with abnormal bleeding or pelvic pain, requiring evaluation for subinvolution.

Billing Considerations

Ensure that all relevant clinical findings and imaging results are documented to support the diagnosis.

Family Medicine

Documentation Requirements

Comprehensive history and physical examination notes, including patient-reported symptoms and any referrals made.

Common Clinical Scenarios

Patients presenting for routine postpartum follow-up with complaints of prolonged bleeding or pain.

Billing Considerations

Coordination with obstetric specialists may be necessary for management and documentation of care.

Coding Guidelines

Inclusion Criteria

Use N85.3 When
  • According to ICD
  • 10 coding guidelines, N85
  • 3 should be used when there is clear documentation of subinvolution of the uterus, with specific attention to the clinical context and any associated conditions
  • It is important to ensure that the diagnosis is supported by clinical findings and imaging results

Exclusion Criteria

Do NOT use N85.3 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

59430CPT Code

Postpartum care visit

Clinical Scenario

Used for follow-up visits in postpartum patients, especially those with complications like subinvolution.

Documentation Requirements

Document the reason for the visit, clinical findings, and any interventions performed.

Specialty Considerations

Obstetricians should ensure comprehensive documentation to support the visit.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like subinvolution of the uterus, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like subinvolution of the uterus, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like subinvolution of the uterus, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What are the common symptoms of subinvolution of the uterus?

Common symptoms include abnormal vaginal bleeding, pelvic pain, and signs of infection such as fever or malaise. Patients may also report fatigue and lightheadedness due to blood loss.

How is subinvolution diagnosed?

Diagnosis is typically made through a combination of clinical examination, patient history, and imaging studies such as ultrasound to assess uterine size and rule out retained products of conception.

What are the treatment options for subinvolution?

Treatment may include medical management with uterotonics to promote uterine contraction, monitoring, and in some cases, surgical intervention if there is retained tissue or severe complications.

How does subinvolution differ from uterine atony?

While both conditions involve inadequate uterine contraction, subinvolution specifically refers to the failure of the uterus to return to its normal size postpartum, often due to retained tissue or infection, whereas atony refers to a lack of muscle tone leading to bleeding.