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ICD-10 Guide
ICD-10 CodesL03.31

L03.31

Non-billable

Cellulitis of trunk

BILLABLE STATUSNo
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/06/2025

Code Description

ICD-10 L03.31 is a used to indicate a diagnosis of cellulitis of trunk.

Key Diagnostic Point:

Cellulitis of the trunk is a bacterial skin infection that affects the dermis and subcutaneous tissues, characterized by redness, swelling, warmth, and pain in the affected area. This condition typically arises from breaks in the skin, such as cuts, insect bites, or surgical wounds, allowing bacteria, most commonly Streptococcus and Staphylococcus species, to penetrate deeper layers. The trunk, which includes the chest and abdomen, is a common site for cellulitis due to its exposure to various environmental factors and potential for skin trauma. Disease progression can lead to systemic symptoms such as fever, chills, and malaise if left untreated. Diagnosis is primarily clinical, supported by patient history and physical examination, although imaging may be warranted in complicated cases to rule out abscess formation or deeper tissue involvement. Laboratory tests, including blood cultures, may be performed in severe cases to identify the causative organism and guide antibiotic therapy. Prompt diagnosis and treatment are crucial to prevent complications such as sepsis or necrotizing fasciitis.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Diagnostic complexity: Requires clinical evaluation and sometimes imaging
  • Treatment complexity: May involve antibiotics and, in severe cases, surgical intervention
  • Documentation requirements: Detailed clinical notes and treatment plans are essential
  • Coding specificity: Requires accurate coding to differentiate from other skin infections

Audit Risk Factors

  • Common coding errors: Misclassification with other skin infections
  • Documentation gaps: Insufficient detail on the extent of infection or treatment
  • Billing challenges: Potential denials if clinical necessity is not well-documented

Specialty Focus

Medical Specialties

Primary medical specialty: Dermatology

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Secondary specialty: Infectious Disease

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Related ICD-10 Codes

Related CPT Codes

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

Cellulitis of the trunk can significantly impact patient health, leading to increased healthcare utilization due to hospitalizations and outpatient visits. The condition is prevalent among populations with compromised skin integrity or immune function. Quality measures related to timely diagnosis and treatment are essential to reduce complications and improve patient outcomes. Understanding the epidemiology of cellulitis can help healthcare providers implement preventive strategies and allocate resources effectively.

ICD-9 vs ICD-10

Cellulitis of the trunk can significantly impact patient health, leading to increased healthcare utilization due to hospitalizations and outpatient visits. The condition is prevalent among populations with compromised skin integrity or immune function. Quality measures related to timely diagnosis and treatment are essential to reduce complications and improve patient outcomes. Understanding the epidemiology of cellulitis can help healthcare providers implement preventive strategies and allocate resources effectively.

Reimbursement & Billing Impact

Reimbursement considerations include the severity of the infection and the complexity of care provided. Common denials may arise from insufficient documentation or failure to demonstrate medical necessity for the services rendered. Coders should ensure that the diagnosis is clearly linked to the services billed, and that any procedures performed are appropriately documented to support the claims.

Resources

Clinical References

  • •
    ICD-10 Official Guidelines for L00-L99
  • •
    Clinical Documentation Requirements

Coding & Billing References

  • •
    ICD-10 Official Guidelines for L00-L99
  • •
    Clinical Documentation Requirements

Frequently Asked Questions

What specific conditions are covered by L03.31?

L03.31 specifically covers cellulitis localized to the trunk, which may include infections arising from skin trauma, surgical wounds, or other breaches in skin integrity. It does not cover cellulitis of other body parts, which are classified under different codes.

When should L03.31 be used instead of related codes?

L03.31 should be used when the infection is localized to the trunk. If the cellulitis is located in the lower limb, L03.32 should be used. Accurate anatomical localization is crucial for correct coding.

What documentation supports L03.31?

Documentation should include a detailed description of the clinical presentation, including the onset of symptoms, physical examination findings, any relevant laboratory results, and the treatment plan. Clear documentation of the trunk's involvement is essential.