ICD-10-CM > M00-M99 > M20-M25 > M23 > M23.6 > M23.64 M23.64 Other spontaneous disruption of lateral collateral ligament of knee Non-Billable/Non-Specific Codes M23.641Other spontaneous disruption of lateral collateral ligament of right kneeM23.642Other spontaneous disruption of lateral collateral ligament of left kneeM23.649Other spontaneous disruption of lateral collateral ligament of unspecified knee