ICD-10-CM > K00-K95 > K00-K14 > K12 > K12.0 K12.0 Recurrent oral aphthae Billable/Specific Copy Code Copy Description Applicable To Aphthous stomatitis (major) (minor)Bednar's aphthaePeriadenitis mucosa necrotica recurrensRecurrent aphthous ulcerStomatitis herpetiformis