T84.041 ICD-10-CA code: Mechanical complication of knee prosthesis, instability
T84.041 is the ICD-10-CA code for “Mechanical complication of knee prosthesis, instability” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
T84.041Mechanical complication of knee prosthesis, instability
Short description: Mech complic instability knee prosth
ICD-10-CA · Canada · Also written T84041
Index terms
Entries in CIHI’s alphabetical index that lead to T84.041. Searching the index by the condition the note names is how coders reach this code.
- Instability, knee (chronic), prosthetic
- Dislocation (articular), knee (closed/open), prosthesis
- Instability, joint (posttraumatic), knee (chronic), prosthetic
- Maltracking, patella (patellar) due to presence of knee prosthesis
- Complication, complications (from) (of), prosthetic device, graft or implant, joint, mechanical, knee, instability
- Complication, complications (from) (of), prosthetic device, graft or implant, joint, mechanical, knee, subluxation
- Complication, complications (from) (of), prosthetic device, graft or implant, joint, mechanical, knee, maltracking, patella
- Complication, complications (from) (of), prosthetic device, graft or implant, joint, mechanical, knee, dislocation (complete) (partial)
Notes for T84.041
As CIHI prints them, with any note T84.041 takes from the headings above it.
Includes
- Dislocation (complete) (partial)Patella maltracking or instability in the presence of a knee prosthesisSubluxation
- Conditions listed in T82.0 due to joint prosthesisFrom T84.0 Mechanical complication of internal joint prosthesis
Use additional code
Add a code for this detail when the note documents it.
- Use additional code (B95-B97) to identify infectious agent.From T80-T88 Complications of surgical and medical care, not elsewhere classified
- Use additional external cause code (Chapter XX) to identify devices involved and details of circumstances.From T80-T88 Complications of surgical and medical care, not elsewhere classified
Excludes
Conditions classified elsewhere.
- Failure and rejection of transplanted organs and tissues (T86.-)fracture of bone following insertion of orthopaedic implant, joint prosthesis or bone plate (M96.6-)From T84 Complications of internal orthopaedic prosthetic devices, implants and grafts
- Adverse effects of drugs and medicaments (A00-R99, T78.-)any encounters with medical care for postoperative conditions in which no complications are present, such as:• artificial opening status (Z93.-)• closure of external stoma (Z43.-)• fitting and adjustment of external prosthetic device (Z44.-)burns and corrosions from local applications and irradiation (T20-T32)complications of surgical procedures during pregnancy, childbirth and the puerperium (O00-O99)poisoning and toxic effects of drugs and chemicals (T36-T65)specified complications classified elsewhere, such as:• cataract (lens) fragments in eye following cataract surgery (H59.80)• colostomy malfunction (K91.4)• complications associated with artificial fertilization (N98.-)• disorders of fluid and electrolyte balance (E86-E87)• functional disturbance following cardiac surgery or due to presence of cardiac prosthesis (I97.0-I97.1)• postgastric surgery syndromes (K91.1)• postlaminectomy syndrome NEC (M96.1)• postmastectomy lymphoedema syndrome (I97.2)• postsurgical blind-loop syndrome (K91.2)From T80-T88 Complications of surgical and medical care, not elsewhere classified
- Birth trauma (P10-P15)obstetric trauma (O70-O71)From Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
Note
- 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 multiple or unspecified body regions as well as poisoning and certain other consequences of external causes.Where multiple sites of injury are specified in the titles, the word "with" indicates involvement of both sites, and the word "and" indicates involvement of either or both sites.The principle of multiple coding of injuries should be followed wherever possible.Combination categories for multiple injuries is provided for use when there are insufficient detail as to the nature of the individual conditions, or for primary tabulation purposes when it is more convenient to record single code; otherwise, the component injuries should be coded separately.Reference should also be made to the coding rules and guidelines.The blocks of the S-section as well as (T00-T14 and T90-T98) contain injuries at the three-character level classified by type as follows:Superficial injury including:abrasionblister (nonthermal)contusion, including bruise and haematomainjury from superficial foreign body (splinter) without major open woundinsect bite (nonvenomous)Open wound including:animal bitecutlacerationpuncture wound:• NOS• with (penetrating) foreign bodyFracture including:Fracture:closed: comminuted, depressed, elevated, fissured, greenstick, impacted, linear, simple, slipped epiphysis, spiral — with or without delayed healingdislocateddisplacedFracture:open: compound, infected, missile, puncture, with foreign body — with or without delayed healingExcludes:malunion of fracture (M84.0)nonunion of fracture [pseudoarthrosis] (M84.1)pathological fracture (M84.4):• with osteoporosis (M80.-)stress fracture (M84.3)Dislocation, sprain and strain including:avulsion, laceration, sprain, strain, traumatic: haemarthosis, rupture, subluxation, tear of cartilage, joint (capsule), ligamentInjury to nerves and spinal cord including:complete or incomplete lesion of spinal cordlesion incontinuity of nerves and spinal cordtraumatic:• division of nerve• haematomyelia• paralysis (transient)• paraplegia• quadriplegiaInjury to blood vessels includingavulsion, cut, laceration, traumatic: aneurysm or fistula (arteriovenous), arterial haematoma, rupture of blood vesselsInjury of muscle, fascia and tendon including:avulsion, cut, laceration, strain, traumatic rupture of muscle, fascia and tendonCrushing InjuryTraumatic amputationInjury to internal organs including:blast injuries, bruise, concussion injuries, crushing, laceration, traumatic: haematoma, puncture, rupture, tear of internal organsOther and unspecified injuriesFrom Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
Where T84.041 sits
- 1ChapterChapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
- 2Block T80-T88Complications of surgical and medical care, not elsewhere classified
- 3Category T84Complications of internal orthopaedic prosthetic devices, implants and grafts
- 4Subcategory T84.0Mechanical complication of internal joint prosthesis
- 5Subcategory T84.04Mechanical complication of knee prosthesis
- 6Valid code T84.041Mechanical complication of knee prosthesis, instability
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code T84.041 mean?
T84.041 is the ICD-10-CA code for “Mechanical complication of knee prosthesis, instability” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is T84.041 in ICD-10-CA?
T84.041 sits under T84.04 Mechanical complication of knee prosthesis, within T84.0 Mechanical complication of internal joint prosthesis, within T84 Complications of internal orthopaedic prosthetic devices, implants and grafts, within T80-T88 Complications of surgical and medical care, not elsewhere classified, within Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98).
What coding notes apply to T84.041?
ICD-10-CA lists Includes, Excludes, Use additional code, Note notes for T84.041, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside T84.041
View T84.04T84.040Mechanical complication of knee prosthesis, looseningT84.042Mechanical complication of knee prosthesis, wear of articular bearing surfaceT84.043Mechanical complication of knee prosthesis, breakage and dissociationT84.044Mechanical complication of knee prosthesis, osteolysis around joint prosthesisT84.045Mechanical complication of knee prosthesis, destruction or cartilage wear of jointT84.048Mechanical complication of knee prosthesis, otherT84.049Mechanical complication of knee prosthesis, unspecified