2021

  1. ICD-10-CM Codes
    2. ›
  2. C00-D49 Neoplasms
    3. ›
  3. C43-C4A Melanoma and other malignant neoplasms of skin
    4. ›
  4. C4A- Merkel cell carcinoma
    5. ›
  5. 2021 ICD-10-CM Diagnosis Code C4A.121

2021 ICD-10-CM Diagnosis Code C4A.121

Merkel cell carcinoma of left upper eyelid, including canthus

    2019 - New Code 2020 2021 Billable/Specific Code
  • C4A.121 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Merkel cell carcinoma of left upper eyelid, inc canthus
  • The 2021 edition of ICD-10-CM C4A.121 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of C4A.121 - other international versions of ICD-10 C4A.121 may differ.
The following code(s) above C4A.121 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 C4A.121:
  • C00-D49
    2021 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
ICD-10-CM C4A.121 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 595 Major skin disorders with mcc
  • 596 Major skin disorders without mcc
Code History
  • 2019 (effective 10/1/2018): New code
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
ICD-10-CM Codes Adjacent To C4A.121
C43.8 Malignant melanoma of overlapping sites of skin
C43.9 Malignant melanoma of skin, unspecified
C4A Merkel cell carcinoma
C4A.0 Merkel cell carcinoma of lip
C4A.1 Merkel cell carcinoma of eyelid, including canthus
C4A.10 Merkel cell carcinoma of unspecified eyelid, including canthus
C4A.11 Merkel cell carcinoma of right eyelid, including canthus
C4A.111 Merkel cell carcinoma of right upper eyelid, including canthus
C4A.112 Merkel cell carcinoma of right lower eyelid, including canthus
C4A.12 Merkel cell carcinoma of left eyelid, including canthus
C4A.121 Merkel cell carcinoma of left upper eyelid, including canthus
C4A.122 Merkel cell carcinoma of left lower eyelid, including canthus
C4A.2 Merkel cell carcinoma of ear and external auricular canal
C4A.20 Merkel cell carcinoma of unspecified ear and external auricular canal
C4A.21 Merkel cell carcinoma of right ear and external auricular canal
C4A.22 Merkel cell carcinoma of left ear and external auricular canal
C4A.3 Merkel cell carcinoma of other and unspecified parts of face
C4A.30 Merkel cell carcinoma of unspecified part of face
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

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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