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Table 1 ICD-10 classification of perineal injuries

From: Impact of electronic and blended learning programs for manual perineal support on incidence of obstetric anal sphincter injuries: a prospective interventional study

Degree Definition
First Injury to vaginal mucosa or perineal skin only
Second Injury to vaginal mucosa or perineal skin and superficial perineal muscles
Third Injury to anal sphincter muscles and subdivided into
 3A < 50% of external anal sphincter muscles is injured
 3B > 50% of external anal sphincter muscle is injured
 3C External and internal anal sphincter muscles are injured
Fourth Injury involving external and internal anal sphincter muscles and anal epithelium