S86.10
Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level
S86.10 is a non-billable ICD-10-CM code header for unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are S86.101 Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, right leg; S86.102 Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, left leg and S86.109 Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg. Its coding notes include a Use additional code instruction, a Code also instruction and 9 Excludes2 entries.
7th characters
Every code below needs one of these (defined at S86).
The appropriate 7th character is to be added to each code from category S86
- Ainitial encounter
- Dsubsequent encounter
- Ssequela
Guidelines tips
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.
Each injury gets its own code unless a combination code exists, with the most serious injury first. Superficial injuries at the same site as a more severe injury are not coded. Injuries during medical care are coded as complications.
Use additional code
Add the listed code as a secondary code, if known.
Also from chapter/block level (1 note)
- code to identify any retained foreign body, if applicable (Z18.-)
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (6 notes)
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
Notes
Also from chapter/block level (2 notes)
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry
More specific codes under S86.10 3
- S86.101Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, right leg7th char needed
- S86.102Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, left leg7th char needed
- S86.109Unspecified injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level, unspecified leg7th char needed