Coding and coverage · ICD-10-CM

S80 › S80.2 › S80.24

S80.249 External constriction, unspecified knee

Not billable (header)Chapter 19

This code needs a 7th character (use X as a placeholder for missing characters).

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7th character codes

  • S80.249A External constriction, unspecified knee, initial encounter
  • S80.249D External constriction, unspecified knee, subsequent encounter
  • S80.249S External constriction, unspecified knee, sequela

Instructional notes

Chapter 19

Excludes2Not included here: the patient may have both; report both when both are present.
Use additional codeAdd a second code for the full picture.
  • code to identify any retained foreign body, if applicable (Z18.-)
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.

Section S80-S89

Excludes2Not included here: the patient may have both; report both when both are present.
  • 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)

S80

Excludes2Not included here: the patient may have both; report both when both are present.
  • superficial injury of ankle and foot (S90.-)
7th charactersThe appropriate 7th character is to be added to each code from category S80
  • A initial encounter
  • D subsequent encounter
  • S sequela

Chapter 19: Injury, poisoning and certain other consequences of external causes · S80-S89 Injuries to the knee and lower leg (S80-S89)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.