ICD-10-CM 2027
ICD-10 code for knee sprain
From the official ICD-10-CM alphabetic index entry “Sprain (joint) (ligament) › knee”. Page updated September 29, 2026.
About coding knee sprain
The ICD-10-CM code for knee sprain is S83.9 (Sprain of unspecified site of knee). The official index lists 11 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on S83.9.
Within S83, choose S83.9 (Sprain of unspecified site of knee) only when documentation doesn't support a more specific option: subluxation and dislocation of patella (S83.0), subluxation and dislocation of knee (S83.1), tear of meniscus, current injury (S83.2), tear of articular cartilage of knee, current (S83.3), sprain of collateral ligament of knee (S83.4), sprain of cruciate ligament of knee (S83.5), sprain of the superior tibiofibular joint and ligament (S83.6) and sprain of other specified parts of knee (S83.8).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific knee sprain codes (official index)
- collateral ligament S83.40 — Sprain of unspecified collateral ligament of knee
- lateral (fibular) S83.42 — Sprain of lateral collateral ligament of knee
- medial (tibial) S83.41 — Sprain of medial collateral ligament of knee
- cruciate ligament S83.50 — Sprain of unspecified cruciate ligament of knee
- anterior S83.51 — Sprain of anterior cruciate ligament of knee
- posterior S83.52 — Sprain of posterior cruciate ligament of knee
- lateral (fibular) collateral ligament S83.42 — Sprain of lateral collateral ligament of knee
- medial (tibial) collateral ligament S83.41 — Sprain of medial collateral ligament of knee
- patellar ligament S76.11 — Strain of quadriceps muscle, fascia and tendon
- specified site NEC S83.8X — Sprain of other specified parts of knee
- superior tibiofibular joint (ligament) S83.6 — Sprain of the superior tibiofibular joint and ligament
Common questions about knee sprain ICD-10 codes
What is the ICD-10 code for knee sprain?
- S83.9 — Sprain of unspecified site of knee (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: S83.40, S83.42, S83.41, S83.50 and others below.
What is the ICD-10 code for collateral ligament knee sprain?
- S83.40 — Sprain of unspecified collateral ligament of knee (header code; choose a more specific subcode).
What is the ICD-10 code for cruciate ligament knee sprain?
- S83.50 — Sprain of unspecified cruciate ligament of knee (header code; choose a more specific subcode).
What is the ICD-10 code for lateral collateral ligament knee sprain?
- S83.42 — Sprain of lateral collateral ligament of knee (header code; choose a more specific subcode).
What is the ICD-10 code for medial collateral ligament knee sprain?
- S83.41 — Sprain of medial collateral ligament of knee (header code; choose a more specific subcode).
What is the ICD-10 code for patellar ligament knee sprain?
- S76.11 — Strain of quadriceps muscle, fascia and tendon (header code; choose a more specific subcode).
What is the ICD-10 code for superior tibiofibular joint knee sprain?
- S83.6 — Sprain of the superior tibiofibular joint and ligament (header code; choose a more specific subcode).
Is S83.9 billable?
- No. S83.9 is a header code. Report one of its more specific subcodes instead.