2024 ICD-10-CM Diagnosis Code C43.9

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Malignant melanoma of skin, unspecified

  • C43.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM C43.9 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of C43.9 – other international versions of ICD-10 C43.9 may differ.

Applicable To

  • Malignant melanoma of unspecified site of skin
  • Melanoma (malignant) NOS

The following code(s) above C43.9 contain annotation back-references

 that may be applicable to C43.9:

  • C00-D49  Neoplasms
  • C43  Malignant melanoma of skin

Approximate Synonyms

  • Acral lentiginous malignant melanoma of skin
  • Amelanotic malignant melanoma of skin
  • Carcinomatosis melanoma
  • Desmoplastic malignant melanoma
  • Lentigo maligna melanoma
  • Malignant melanoma of skin
  • Malignant melanoma of unknown origin
  • Melanoma
  • Melanoma, carcinomatosis
  • Melanoma, metastatic
  • Melanoma, metastatic to bilateral lungs
  • Melanoma, metastatic to bone
  • Melanoma, metastatic to kidney
  • Melanoma, metastatic to left lung
  • Melanoma, metastatic to liver
  • Melanoma, metastatic to lung
  • Melanoma, metastatic to lymph node
  • Melanoma, metastatic to pancreas
  • Melanoma, metastatic to right lung
  • Melanoma, metastatic to skin
  • Melanoma, skin, acrolentiginous
  • Melanoma, skin, amelanotic
  • Melanoma, skin, desmoplastic
  • Melanoma, skin, nodular
  • Melanoma, skin, superficial spreading
  • Melanoma, unknown primary
  • Metastatic malignant melanoma
  • Nodular malignant melanoma of skin
  • Secondary malignant melanoma of bilateral lungs
  • Secondary malignant melanoma of bone
  • Secondary malignant melanoma of kidney
  • Secondary malignant melanoma of left lung
  • Secondary malignant melanoma of liver
  • Secondary malignant melanoma of lung
  • Secondary malignant melanoma of lymph node
  • Secondary malignant melanoma of pancreas
  • Secondary malignant melanoma of right lung
  • Secondary malignant melanoma of skin
  • Superficial spreading malignant melanoma of skin

Clinical Information

  • A primary melanoma arising from atypical melanocytes in the skin. Precursor lesions include acquired and congenital melanocytic nevi, and dysplastic nevi. Several histologic variants have been recognized, including superficial spreading melanoma, acral lentiginous melanoma, nodular melanoma, and lentigo maligna melanoma.

ICD-10-CM C43.9 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 595 Major skin disorders with mcc
  • 596 Major skin disorders without mcc

Convert C43.9 to ICD-9-CMCode History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change

Diagnosis Index entries containing back-references to C43.9: