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v1.0.0
ICD-10 Guide
ICD-10 CodesC44.5

C44.5

Billable

Other and unspecified malignant neoplasm of skin of trunk

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

Code Description

ICD-10 C44.5 is a billable code used to indicate a diagnosis of other and unspecified malignant neoplasm of skin of trunk.

Key Diagnostic Point:

C44.5 refers to malignant neoplasms of the skin located on the trunk that do not fit into more specific categories of skin cancer. This includes a variety of skin malignancies that may arise from different skin layers, such as basal cell carcinoma, squamous cell carcinoma, and melanoma, among others. The trunk encompasses the chest, abdomen, and back, making it a common site for skin cancers, particularly in individuals with significant sun exposure. Risk factors include prolonged UV exposure, fair skin, and a history of sunburns. Surgical management often involves excision of the tumor with clear margins to ensure complete removal and minimize recurrence. Reconstruction may be necessary depending on the size and location of the excised lesion, which can involve techniques such as skin grafting or flap surgery. Accurate coding is essential for proper treatment planning and reimbursement, as well as for tracking cancer incidence and outcomes.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in documentation of tumor type and location
  • Need for precise surgical margin descriptions
  • Differentiation from benign skin lesions
  • Potential for multiple malignancies in the same patient

Audit Risk Factors

  • Inadequate documentation of tumor characteristics
  • Failure to specify surgical margins
  • Misclassification of benign versus malignant lesions
  • Inconsistent coding of multiple skin cancers

Specialty Focus

Medical Specialties

Dermatology

Documentation Requirements

Detailed descriptions of lesion characteristics, size, location, and surgical margins.

Common Clinical Scenarios

Diagnosis and treatment of skin cancers, including excisions and reconstructions.

Billing Considerations

Ensure clear documentation of malignancy type and treatment rationale to support coding.

Oncology

Documentation Requirements

Comprehensive treatment plans, including chemotherapy or radiation therapy details if applicable.

Common Clinical Scenarios

Management of advanced skin cancers requiring multidisciplinary approaches.

Billing Considerations

Document staging and grading of tumors for accurate coding and treatment planning.

Coding Guidelines

Inclusion Criteria

Use C44.5 When
  • Follow ICD
  • CM guidelines for coding neoplasms, ensuring to document the specific site, type, and behavior of the tumor
  • 5 is used when the malignancy is unspecified or does not fit into more specific categories
  • Ensure compliance with the latest coding updates and guidelines

Exclusion Criteria

Do NOT use C44.5 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

11400CPT Code

Excision, malignant skin lesion

Clinical Scenario

Used when excising a malignant skin lesion on the trunk.

Documentation Requirements

Document size, location, and margins of the excised lesion.

Specialty Considerations

Dermatologists should ensure accurate coding based on the excised lesion's characteristics.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of skin cancers, but C44.5 remains important for unspecified cases. It emphasizes the need for thorough documentation to avoid ambiguity in treatment and billing.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of skin cancers, but C44.5 remains important for unspecified cases. It emphasizes the need for thorough documentation to avoid ambiguity in treatment and billing.

Reimbursement & Billing Impact

billing.

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

When should I use C44.5 instead of more specific codes?

C44.5 should be used when the specific type of malignant neoplasm is not documented or when it does not fit into more specific categories. Always refer to pathology reports and clinical notes for guidance.