2023

  1. ICD-10-CM Codes
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  2. C00-D49
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  3. C43-C4A
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  4. C43-
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  5. 2023 ICD-10-CM Diagnosis Code C43

2023 ICD-10-CM Diagnosis Code C43

Malignant melanoma of skin

    2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
  • C43 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2023 edition of ICD-10-CM C43 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of C43 - other international versions of ICD-10 C43 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as C43. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • melanoma in situ (
    ICD-10-CM Diagnosis Code D03
    • D03 Melanoma in situ
      • D03.0 Melanoma in situ of lip
      • D03.1 Melanoma in situ of eyelid, including canthus...
        • D03.10 Melanoma in situ of unspecified eyelid, inclu...
        • D03.11 Melanoma in situ of right eyelid, including c...
          • D03.111 Melanoma in situ of right upper eyelid, inclu...
          • D03.112 Melanoma in situ of right lower eyelid, inclu...
        • D03.12 Melanoma in situ of left eyelid, including ca...
          • D03.121 Melanoma in situ of left upper eyelid, includ...
          • D03.122 Melanoma in situ of left lower eyelid, includ...
      • D03.2 Melanoma in situ of ear and external auricula...
        • D03.20 Melanoma in situ of unspecified ear and exter...
        • D03.21 Melanoma in situ of right ear and external au...
        • D03.22 Melanoma in situ of left ear and external aur...
      • D03.3 Melanoma in situ of other and unspecified par...
        • D03.30 Melanoma in situ of unspecified part of face
        • D03.39 Melanoma in situ of other parts of face
      • D03.4 Melanoma in situ of scalp and neck
      • D03.5 Melanoma in situ of trunk
        • D03.51 Melanoma in situ of anal skin
        • D03.52 Melanoma in situ of breast (skin) (soft tissu...
        • D03.59 Melanoma in situ of other part of trunk
      • D03.6 Melanoma in situ of upper limb, including sho...
        • D03.60 Melanoma in situ of unspecified upper limb, i...
        • D03.61 Melanoma in situ of right upper limb, includi...
        • D03.62 Melanoma in situ of left upper limb, includin...
      • D03.7 Melanoma in situ of lower limb, including hip...
        • D03.70 Melanoma in situ of unspecified lower limb, i...
        • D03.71 Melanoma in situ of right lower limb, includi...
        • D03.72 Melanoma in situ of left lower limb, includin...
      • D03.8 Melanoma in situ of other sites
      • D03.9 Melanoma in situ, unspecified
    D03.-
    )
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (C43) and the excluded code together.
  • malignant melanoma of skin of genital organs (
    ICD-10-CM Diagnosis Code C51

    Malignant neoplasm of vulva

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • carcinoma in situ of vulva (D07.1)
    C51
    -
    ICD-10-CM Diagnosis Code C52

    Malignant neoplasm of vagina

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Female Dx
    Type 1 Excludes
    • carcinoma in situ of vagina (D07.2)
    C52
    ,
    ICD-10-CM Diagnosis Code C60
    • C60 Malignant neoplasm of penis
      • C60.0 Malignant neoplasm of prepuce
      • C60.1 Malignant neoplasm of glans penis
      • C60.2 Malignant neoplasm of body of penis
      • C60.8 Malignant neoplasm of overlapping sites of pe...
      • C60.9 Malignant neoplasm of penis, unspecified
    C60.-
    ,
    ICD-10-CM Diagnosis Code C63
    • C63 Malignant neoplasm of other and unspecified m...
      • C63.0 Malignant neoplasm of epididymis
        • C63.00 Malignant neoplasm of unspecified epididymis
        • C63.01 Malignant neoplasm of right epididymis
        • C63.02 Malignant neoplasm of left epididymis
      • C63.1 Malignant neoplasm of spermatic cord
        • C63.10 Malignant neoplasm of unspecified spermatic c...
        • C63.11 Malignant neoplasm of right spermatic cord
        • C63.12 Malignant neoplasm of left spermatic cord
      • C63.2 Malignant neoplasm of scrotum
      • C63.7 Malignant neoplasm of other specified male ge...
      • C63.8 Malignant neoplasm of overlapping sites of ma...
      • C63.9 Malignant neoplasm of male genital organ, uns...
    C63.-
    )
  • Merkel cell carcinoma (
    ICD-10-CM Diagnosis Code C4A
    • C4A Merkel cell carcinoma
      • C4A.0 Merkel cell carcinoma of lip
      • C4A.1 Merkel cell carcinoma of eyelid, including ca...
        • C4A.10 Merkel cell carcinoma of unspecified eyelid, ...
        • C4A.11 Merkel cell carcinoma of right eyelid, includ...
          • C4A.111 Merkel cell carcinoma of right upper eyelid, ...
          • C4A.112 Merkel cell carcinoma of right lower eyelid, ...
        • C4A.12 Merkel cell carcinoma of left eyelid, includi...
          • C4A.121 Merkel cell carcinoma of left upper eyelid, i...
          • C4A.122 Merkel cell carcinoma of left lower eyelid, i...
      • C4A.2 Merkel cell carcinoma of ear and external aur...
        • C4A.20 Merkel cell carcinoma of unspecified ear and ...
        • C4A.21 Merkel cell carcinoma of right ear and extern...
        • C4A.22 Merkel cell carcinoma of left ear and externa...
      • C4A.3 Merkel cell carcinoma of other and unspecifie...
        • C4A.30 Merkel cell carcinoma of unspecified part of ...
        • C4A.31 Merkel cell carcinoma of nose
        • C4A.39 Merkel cell carcinoma of other parts of face
      • C4A.4 Merkel cell carcinoma of scalp and neck
      • C4A.5 Merkel cell carcinoma of trunk
        • C4A.51 Merkel cell carcinoma of anal skin
        • C4A.52 Merkel cell carcinoma of skin of breast
        • C4A.59 Merkel cell carcinoma of other part of trunk
      • C4A.6 Merkel cell carcinoma of upper limb, includin...
        • C4A.60 Merkel cell carcinoma of unspecified upper li...
        • C4A.61 Merkel cell carcinoma of right upper limb, in...
        • C4A.62 Merkel cell carcinoma of left upper limb, inc...
      • C4A.7 Merkel cell carcinoma of lower limb, includin...
        • C4A.70 Merkel cell carcinoma of unspecified lower li...
        • C4A.71 Merkel cell carcinoma of right lower limb, in...
        • C4A.72 Merkel cell carcinoma of left lower limb, inc...
      • C4A.8 Merkel cell carcinoma of overlapping sites
      • C4A.9 Merkel cell carcinoma, unspecified
    C4A.-
    )
  • sites other than skin-code to malignant neoplasm of the site
The following code(s) above C43 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C43:
  • C00-D49
    2023 ICD-10-CM Range C00-D49

    Neoplasms

    Note
    • Functional activity
    • 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.
    • Morphology [Histology]
    • 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.
    • Primary malignant neoplasms overlapping site boundaries
    • 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.
    • Malignant neoplasm of ectopic tissue
    • 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).
    Neoplasms
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.
Code 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
Code annotations containing back-references to C43:
  • Type 1 Excludes: C44
    ICD-10-CM Diagnosis Code C44

    Other and unspecified malignant neoplasm of skin

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Includes
    • malignant neoplasm of sebaceous glands
    • malignant neoplasm of sweat glands
    Type 1 Excludes
    • Kaposi's sarcoma of skin (C46.0)
    • malignant melanoma of skin (C43.-)
    • malignant neoplasm of skin of genital organs (C51-C52, C60.-, C63.2)
    • Merkel cell carcinoma (C4A.-)
  • Applicable To: Z85.820
    ICD-10-CM Diagnosis Code Z85.820

    Personal history of malignant melanoma of skin

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt
    Applicable To
    • Conditions classifiable to C43
ICD-10-CM Codes Adjacent To C43
C40.90 Malignant neoplasm of unspecified bones and articular cartilage of unspecified limb
C40.91 Malignant neoplasm of unspecified bones and articular cartilage of right limb
C40.92 Malignant neoplasm of unspecified bones and articular cartilage of left limb
C41 Malignant neoplasm of bone and articular cartilage of other and unspecified sites
C41.0 Malignant neoplasm of bones of skull and face
C41.1 Malignant neoplasm of mandible
C41.2 Malignant neoplasm of vertebral column
C41.3 Malignant neoplasm of ribs, sternum and clavicle
C41.4 Malignant neoplasm of pelvic bones, sacrum and coccyx
C41.9 Malignant neoplasm of bone and articular cartilage, unspecified
C43 Malignant melanoma of skin
C43.0 Malignant melanoma of lip
C43.1 Malignant melanoma of eyelid, including canthus
C43.10 Malignant melanoma of unspecified eyelid, including canthus
C43.11 Malignant melanoma of right eyelid, including canthus
C43.111 Malignant melanoma of right upper eyelid, including canthus
C43.112 Malignant melanoma of right lower eyelid, including canthus
C43.12 Malignant melanoma of left eyelid, including canthus
C43.121 Malignant melanoma of left upper eyelid, including canthus
C43.122 Malignant melanoma of left lower eyelid, including canthus
C43.2 Malignant melanoma of ear and external auricular canal

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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