Evidence Checklist: Anal Fistula (Fistula in Ano)
DC 7335
Significant gaps — claim likely to be denied or underrated
Specialist Opinion (Highest Value)
Proctologic examination documenting fistula tract, external opening, and drainageCritical
Clinical examination documenting the external opening location (Parks classification), internal opening, tract complexity (simple vs. complex/intersphincteric/trans-sphincteric), and drainage characteristics.
MRI pelvis (MRI fistulography) mapping fistula tract anatomyCritical
High-resolution MRI of the pelvis documenting the fistula tract anatomy relative to the sphincter muscles — essential for surgical planning and documenting complexity.
Nexus opinion linking anal fistula to service ("at least as likely as not")Critical
A medical opinion connecting fistula formation to service-connected Crohn's disease, perianal abscess during service, perineal trauma, or other service-related anorectal disease.
Treating Physician
Documentation of chronic drainage and wound care requirements
Medical records or personal statement documenting persistent drainage from the fistula, wound care requirements (dressings, padding), fecal soiling, and hygiene impact.
Fecal incontinence documentation (if sphincter damage present)
Clinical documentation of fecal incontinence resulting from sphincter damage from the fistula tract or surgical repair — supports additional rating consideration.
Treatment Records
Surgical records for fistulotomy, seton placement, or flap repair
Operative reports documenting surgical procedures performed (fistulotomy, seton placement, LIFT procedure, advancement flap, fibrin glue), recurrence, and post-operative course.
Lay Statements & Personal Documentation
Buddy statement from spouse, family, or fellow service member
A written statement from someone who can describe observable symptoms and how your condition affects daily life.
Personal statement describing symptoms and functional impact
Your own written account of how this condition affects your daily activities, work, and relationships. Describe your worst days.
Disability Benefits Questionnaire (DBQ)
Completed DBQ Rectum and Anus ConditionsCritical
Standardized form capturing fistula anatomy, drainage, sphincter integrity, incontinence, and treatment history.
Service Records
Service treatment records (STRs)Critical
Military medical records showing in-service treatment, complaints, or injuries related to this condition.