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Malignant melanoma vs Melanoma In Situ mappings from ICD10 to SNOMED

These four ICD10 codes:
C43.111 | Malignant melanoma of right upper eyelid, including canthus
C43.112 | Malignant melanoma of right lower eyelid, including canthus
C43.121 | Malignant melanoma of left upper eyelid, including canthus
C43.122 | Malignant melanoma of left lower eyelid, including canthus

are all mapped to this CONCEPT_ID
4033836 | Melanoma in situ of eyelid, including canthus

This seems to be an outlier, because malignant melanoma is different than melanoma in situ. There is another, probably better code to map to:
40390677 | Malignant melanoma of eyelid including canthus
but this code is marked as non-standard.

Any suggestions?

@scottduvall sorry for not getting back to you earlier, having looked into the issue you made a great call as the concept ID 4033836 doesn’t exactly provide a good mapping to any of the aforementioned ICD codes.
The suggested concept ID 40390677 which is a more suitable mapping is however marked as non-standard because it has been deprecated and replaced by concept ID 4338760.
Here is a github issue link for tracking it https://github.com/OHDSI/Vocabulary-v5.0/issues/704