Alphabetic Index FY2027

S86.912S

Strain of unspecified muscle(s) and tendon(s) at lower leg level, left leg, sequela

FY2027Chapter 19: Injury, poisoning and certain other consequences of external causes/S80–S89 Injuries to the knee and lower leg

BillableComplete code, valid to report
Care settingsHome Health Primary · Musculoskeletal Rehabilitation

S86.912S (also written S86912S) is a billable ICD-10-CM diagnosis code for strain of unspecified muscle(s) and tendon(s) at lower leg level, left leg, sequela. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 216 codes in category S86 (Injury of muscle, fascia and tendon at lower leg level). Its 7th character, S, means sequela. Its coding notes include a Use additional code instruction, a Code also instruction and 9 Excludes2 entries.

7th character

Category S86 requires a 7th character.

Assembled code S86.912S Open code

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.

Guidelines I.C.19.aInjuries: application of 7th charactersRead the official text

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.

Guidelines I.C.19.bCoding of injuriesRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • 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.

Inherited from S86 Injury of muscle, fascia and tendon at lower leg level
  • any associated open wound (S81.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from S86 Injury of muscle, fascia and tendon at lower leg level
  • injury of muscle, fascia and tendon at ankle (S96.-)
  • injury of patellar ligament (tendon) (S76.1-)
  • sprain of joints and ligaments of knee (S83.-)
Also from chapter/block level (6 notes)
Inherited from S80–S89 Injuries to the knee and lower leg
  • burns and corrosions (T20-T32)
  • frostbite (T33-T34)
  • injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
  • insect bite or sting, venomous (T63.4)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Musculoskeletal Rehabilitation clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

Notes

Also from chapter/block level (2 notes)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • 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.