C43.9

Malignant melanoma of skin, unspecified

Billable / specificHCC V28 23

C43.9 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Applicable to

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

Includes (from C43)

  • Note: Functional activity
  • Note: All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Note: Morphology [Histology]
  • Note: Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Note: Primary malignant neoplasms overlapping site boundaries
  • Note: A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Note: Malignant neoplasm of ectopic tissue
  • Note: Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

Excludes1

Not coded here — never report together with this code.

  • melanoma in situ (D03.-) (from C43)

Excludes2

Not included here — may be reported together when both conditions exist.

  • malignant melanoma of skin of genital organs (C51-C52, C60.-, C63.-) (from C43)
  • Merkel cell carcinoma (C4A.-) (from C43)
  • sites other than skin-code to malignant neoplasm of the site (from C43)

Also known as

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

Parent code

  • C43Malignant melanoma of skinHeader

Related codes

  • C43.0Malignant melanoma of lipBillable
  • C43.1Malignant melanoma of eyelid, including canthusHeader
  • C43.2Malignant melanoma of ear and external auricular canalHeader
  • C43.3Malignant melanoma of other and unspecified parts of faceHeader
  • C43.4Malignant melanoma of scalp and neckBillable
  • C43.5Malignant melanoma of trunkHeader
  • C43.6Malignant melanoma of upper limb, including shoulderHeader
  • C43.7Malignant melanoma of lower limb, including hipHeader
  • C43.8Malignant melanoma of overlapping sites of skinBillable

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