ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.0 > S86.01 S86.01 Strain of Achilles tendon Non-Billable/Non-Specific Codes S86.011Strain of right Achilles tendonS86.011A..., initial encounterS86.011D..., subsequent encounterS86.011S..., sequelaS86.012Strain of left Achilles tendonS86.012A..., initial encounterS86.012D..., subsequent encounterS86.012S..., sequelaS86.019Strain of unspecified Achilles tendonS86.019A..., initial encounterS86.019D..., subsequent encounterS86.019S..., sequela