Convert to ICD-10-CM:
172.4 converts approximately to:
- 2015/16 ICD-10-CM C43.4 Malignant melanoma of scalp and neck
Or:
- 2015/16 ICD-10-CM D03.4 Melanoma in situ of scalp and neck
ICD-9-CM Volume 2 Index entries containing back-references to
172.4:
- Melanoma (malignant) (M8720/3) 172.9

neck 172.4
scalp 172.4