What are the appropriate ICD‑10‑CM diagnosis code and ICD‑10‑PCS procedure code for excising skin cancer on the nose?

ICD-10 Coding for Dermatologic Removal of Skin Cancer on the Nose

For coding dermatologic removal of skin cancer on the nose, you need both a diagnosis code specifying the type and location of skin cancer (ICD-10-CM) and a procedure code describing the excision method (ICD-10-PCS).

Diagnosis Codes (ICD-10-CM)

The specific diagnosis code depends on the histologic type of skin cancer:

Basal Cell Carcinoma (BCC)

• C44.311 - Basal cell carcinoma of skin of nose (most common)

Squamous Cell Carcinoma (SCC)

• C44.321 - Squamous cell carcinoma of skin of nose

Melanoma

• C43.31 - Malignant melanoma of nose

Other/Unspecified

• C44.301 - Unspecified malignant neoplasm of skin of nose (use only when histology is not yet confirmed)

Procedure Codes (ICD-10-PCS)

The procedure code depends on the surgical technique and extent:

Standard Excision

• 0HBX series - Excision of skin and breast (X = specific body part code for face/nose)
• The 7-character code structure includes: body system, root operation, body part, approach, device, and qualifier

Mohs Micrographic Surgery

• Typically coded as 0HBX0ZZ with appropriate modifiers, though Mohs may require specific CPT codes (17311-17315) for billing purposes rather than ICD-10-PCS

Clinical Context for Code Selection

The nose is classified as a high-risk location for both BCC and SCC 1, 2. This anatomical designation affects both treatment approach and coding specificity:

• High-risk tumors on the nose require wider excision margins (≥6 mm) or Mohs micrographic surgery 1
• The nose falls within the "H-zone" (high-risk facial area) per NCCN guidelines 3
• Mohs surgery is recommended for high-risk BCC and SCC on the nose 2, 3, 4

Important Coding Considerations

Always code to the highest level of specificity available - this means using the exact histologic subtype once pathology confirms the diagnosis. The evidence shows that unspecified codes should be avoided when detailed information is available 5, 6.

Common Pitfalls to Avoid:

1. Don't use unspecified codes (C44.301) when histology is known - this reduces data accuracy and may affect reimbursement
2. Match the procedure code to the actual technique performed - standard excision vs. Mohs surgery have different codes
3. Include laterality when applicable - though the nose is midline, document if the lesion extends to one side
4. Document margins in the operative note - this supports the procedure code selected 1, 3

Documentation Requirements:

For accurate coding, the medical record should specify:

• Exact anatomic location (e.g., nasal tip, ala, dorsum)
• Histologic type and grade
• Tumor size
• Excision margins taken
• Whether margins were clear on pathology
• Surgical technique used (standard excision, Mohs, etc.)

The ICD-10-CM code should reflect the confirmed pathologic diagnosis, not just clinical suspicion, and the ICD-10-PCS code should accurately represent the surgical procedure performed with complete margin assessment 3, 4.