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ICD-10 Guide
ICD-10 CodesC44.721

C44.721

Billable

Squamous cell carcinoma of skin of unspecified lower limb, including hip

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

Code Description

ICD-10 C44.721 is a billable code used to indicate a diagnosis of squamous cell carcinoma of skin of unspecified lower limb, including hip.

Key Diagnostic Point:

Squamous cell carcinoma (SCC) is a common form of skin cancer that arises from the squamous cells in the epidermis. This specific code, C44.721, refers to SCC located on the skin of the unspecified lower limb, including the hip. SCC is often associated with prolonged sun exposure, which can lead to DNA damage in skin cells. Risk factors include fair skin, a history of sunburns, and immunosuppression. Clinically, SCC may present as a persistent sore, a scaly patch, or a growth that may bleed or crust. Diagnosis is typically confirmed through a biopsy. Treatment options vary based on the size and location of the tumor and may include surgical excision, Mohs micrographic surgery, cryotherapy, or topical chemotherapy. Surgical margins are critical in ensuring complete removal of the cancerous tissue, and reconstruction may be necessary depending on the extent of the excision. Follow-up care is essential to monitor for recurrence, especially in high-risk patients.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in presentation and symptoms of SCC
  • Need for precise documentation of surgical margins
  • Potential for reconstruction procedures post-excision
  • Differentiation from other skin lesions

Audit Risk Factors

  • Inadequate documentation of tumor size and location
  • Failure to document surgical margins
  • Lack of follow-up documentation
  • Inconsistent coding of related procedures

Specialty Focus

Medical Specialties

Dermatology

Documentation Requirements

Detailed descriptions of lesion characteristics, biopsy results, and treatment plans.

Common Clinical Scenarios

Diagnosis and treatment of SCC, follow-up for recurrence, and management of skin lesions.

Billing Considerations

Ensure accurate documentation of the lesion's size, location, and any prior treatments.

Oncology

Documentation Requirements

Comprehensive treatment plans, including surgical and non-surgical interventions.

Common Clinical Scenarios

Management of advanced SCC, coordination of care with dermatology, and monitoring for metastasis.

Billing Considerations

Document any systemic therapies or clinical trials being considered.

Coding Guidelines

Inclusion Criteria

Use C44.721 When
  • According to ICD
  • 10 guidelines, C44
  • 721 should be used when the specific site of the squamous cell carcinoma is not documented
  • Coders should ensure that the diagnosis is confirmed through appropriate clinical documentation and that any related procedures are accurately coded

Exclusion Criteria

Do NOT use C44.721 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

11600CPT Code

Excision, malignant skin lesion

Clinical Scenario

Used when excising SCC from the lower limb.

Documentation Requirements

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

Specialty Considerations

Dermatologists should ensure clear documentation of the procedure and follow-up care.

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, improving the accuracy of data collection and reimbursement processes. C44.721 provides granularity that was not available in ICD-9, facilitating better tracking of treatment outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of skin cancers, improving the accuracy of data collection and reimbursement processes. C44.721 provides granularity that was not available in ICD-9, facilitating better tracking of treatment outcomes.

Reimbursement & Billing Impact

reimbursement processes. C44.721 provides granularity that was not available in ICD-9, facilitating better tracking of treatment outcomes.

Resources

Clinical References

  • •
    American Academy of Dermatology

Coding & Billing References

  • •
    American Academy of Dermatology

Frequently Asked Questions

What is the significance of documenting surgical margins?

Documenting surgical margins is crucial to ensure complete removal of cancerous tissue and to assess the risk of recurrence. Clear margins indicate that the cancer has been fully excised, which is vital for patient prognosis.