ICD-9-CM Vol. 1 Diagnostic Codes →
2. NEOPLASMS (140-239) →
section notes
MALIGNANT NEOPLASM OF BONE, CONNECTIVE TISSUE, SKIN, AND BREAST (170-176) →
section notes
173 Other and unspecified malignant neoplasm of skin →
section notes
173.2 Other and unspecified malignant neoplasm of skin of ear and external auditory canal →
section notes
173.20   Malig neo skin ear NOS
173.21   Basal cell ca skin ear
173.22   Squam cell ca skin ear
173.29   Neo skin ear/ex canl NEC
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