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ICD-10-CM Codes
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C00-D49
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C43-C4A
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C4A-
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2023 ICD-10-CM Diagnosis Code C4A.121
2023 ICD-10-CM Diagnosis Code C4A.121
Merkel cell carcinoma of left upper eyelid, including canthus
2019 - New Code 2020 2021 2022 2023 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 2023 edition of ICD-10-CM C4A.121 became effective on October 1, 2022.
- 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:
ICD-10-CM C4A.121 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
- 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
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): 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.