S83.146
Lateral dislocation of proximal end of tibia, unspecified knee
Not billable — category only FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 5 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 14 never code together
S83code
Excludes2
- derangement of patella (M22.0-M22.3)M22.0-M22.3
- injury of patellar ligament (tendon) (S76.1-)S76.1-
- internal derangement of knee (M23.-)M23.-
- old dislocation of knee (M24.36)M24.36
- pathological dislocation of knee (M24.36)M24.36
- recurrent dislocation of knee (M22.0)M22.0
- strain of muscle, fascia and tendon of lower leg (S86.-)S86.-
S80-S89block
Excludes2 — not included here, but the patient may have both. Code both when documented.
7th character 3
A initial encounter
D subsequent encounter
S sequela
Instructional notes 11
S83code
Includes
- avulsion of joint or ligament of knee
- laceration of cartilage, joint or ligament of knee
- sprain of cartilage, joint or ligament of knee
- traumatic hemarthrosis of joint or ligament of knee
- traumatic rupture of joint or ligament of knee
- traumatic subluxation of joint or ligament of knee
- traumatic tear of joint or ligament of knee
Code also
- any associated open wound
S00-T88chapter
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.
Use additional code
- code to identify any retained foreign body, if applicable (Z18.-)Z18.-
Index entries leading here 2
Alongside this code 5 same parent — S83.14
S83.141 Lateral subluxation of proximal end of tibia, right knee category S83.142 Lateral subluxation of proximal end of tibia, left knee category S83.143 Lateral subluxation of proximal end of tibia, unsp knee category S83.144 Lateral dislocation of proximal end of tibia, right knee category S83.145 Lateral dislocation of proximal end of tibia, left knee category
Subordinate codes 3
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.