W4212: Minimally invasive knee replacement
Minimally invasive knee replacement +/- cement +/- patella resurfacing - unilateral
For guidance only. Always check the code and obtain authorisation from your insurer before treatment. Other insurers may use different codes and coding rules.
Also known as
For guidance only. Procedure codes and descriptions on this site are provided for general guidance only and are not a guarantee of insurance cover or payment. Always check the correct code with your surgeon's secretary and obtain authorisation from your insurer before treatment. Insurers shown are examples only. Other insurers are available, and each may use the same, similar or different codes and coding rules.
Insurer listing
| Insurer | Status | Notes |
|---|---|---|
| Bupa | Listed | Listed by Bupa |
| AXA Health | Listed | Listed by AXA Health |
| Vitality | Listed | Listed by Vitality |
| WPA | Listed | Listed by WPA |
Codes that can't be billed with W4212
Neither code can be billed with the other
- W8700: Diagnostic arthroscopic examination of joint, +/- biopsy (not otherwise specified) (as sole procedure)
- W9240: Examination/ manipulation of joint under general anaesthetic +/- injection +/- arthrogram (as sole procedure)
- W9040: Injection(s) +/- aspiration, into joint, cyst, bursa - unilateral
- W0633: Prosthetic replacement of patellofemoral joint - bilateral (as sole procedure)
- W5830: Robotic assisted total knee replacement – unilateral +/- cement, +/- patella
- W4210: Total prosthetic replacement of knee joint +/- cement +/- patella resurfacing - unilateral
- W9020: Dynamic arthrogram of joint
- W5822: Robotic assisted revision of unicompartmental knee replacement - unilateral
W4212 can't be billed with
AXA Health also lists these codes as unacceptable combinations (10)
- W9040: Injection(s) +/- aspiration, into joint, cyst, bursa - unilateral
- W5800: Conversion of a unicompartmental knee replacement to a total replacement of knee joint
- A7350: Local anaesthetic blockade of named major nerve or plexus
- W9030: Injection(s) +/- aspiration, into joint, cyst, bursa with image guidance - unilateral
- W9020: Dynamic arthrogram of joint
- W8700: Diagnostic arthroscopic examination of joint, +/- biopsy (not otherwise specified) (as sole procedure)
- W0633: Prosthetic replacement of patellofemoral joint - bilateral (as sole procedure)
- W5210: Revision of unicompartmental knee replacement - unilateral
- W4210: Total prosthetic replacement of knee joint +/- cement +/- patella resurfacing - unilateral
- W9240: Examination/ manipulation of joint under general anaesthetic +/- injection +/- arthrogram (as sole procedure)
Related codes
- W4280: Total prosthetic replacement of knee joint +/- cement +/- patella resurfacing - bilateral
- W4210: Total prosthetic replacement of knee joint +/- cement +/- patella resurfacing - unilateral
- W5831: Robotic assisted total knee replacement - bilateral +/- cement, +/- patella
- W5830: Robotic assisted total knee replacement – unilateral +/- cement, +/- patella
- W5810: Patella resurfacing (as sole procedure)
- W5300: Bicompartmental knee resurfacing
Frequently asked questions
What is the procedure code for minimally invasive knee replacement?
The procedure code is W4212: Minimally invasive knee replacement +/- cement +/- patella resurfacing - unilateral.
Which insurers list W4212?
W4212 is listed by Bupa, AXA Health, Vitality and WPA. Always confirm the code and cover with your insurer.
Can W4212 be billed with other procedures?
The coding rules say W4212 cannot be billed together with 11 other codes, including W8700 (Diagnostic arthroscopic examination of joint, +/- biopsy (not otherwise specified) (as sole procedure)), W9240 (Examination/ manipulation of joint under general anaesthetic +/- injection +/- arthrogram (as sole procedure)), W9040 (Injection(s) +/- aspiration, into joint, cyst, bursa - unilateral). See the full list above.
About the surgeon
Mr Jakub Kozdryk, Consultant Orthopaedic Surgeon, performs hip and knee replacement and revision surgery at Nuffield Health Warwickshire and Circle Meriden Hospital.
Knee replacement with Mr Kozdryk →Book an appointment with Mr Kozdryk →
For guidance only. Procedure codes and descriptions on this site are provided for general guidance only and are not a guarantee of insurance cover or payment. Always check the correct code with your surgeon's secretary and obtain authorisation from your insurer before treatment. Insurers shown are examples only. Other insurers are available, and each may use the same, similar or different codes and coding rules.
Codes and descriptions are for guidance only. Insurer listing and cover information is taken from each insurer's published schedule and is for guidance only: always confirm the code and cover with the insurer before treatment. This site is not affiliated with CCSD or any insurer. No fees are shown.
Last checked: 2026-10-01