383.31
Mucosal cyst of postmastoidectomy cavity
The ICD-9 code for mucosal cyst of postmastoidectomy cavity is 383.31.
Legacy code — retired October 1, 2015ICD-10-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents.
View ICD-9 → ICD-10 crosswalk for 383.31 →