M65.1
M65.1 — Other infective (teno)synovitis
Non-billable headerICD-10-CM
M65.1 is a non-billable header ICD-10-CM code for other infective (teno)synovitis. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with M65.1
These codes carry an Excludes1 note pointing at M65.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M65.1 alone.
- M25.4Effusion of joint
Risk adjustment
M65.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead M65.1
10 child codes. Green means billable.
- M65.10Other infective (teno)synovitis, unspecified site
- M65.11Other infective (teno)synovitis, shoulder
- M65.12Other infective (teno)synovitis, elbow
- M65.13Other infective (teno)synovitis, wrist
- M65.14Other infective (teno)synovitis, hand
- M65.15Other infective (teno)synovitis, hip
- M65.16Other infective (teno)synovitis, knee
- M65.17Other infective (teno)synovitis, ankle and foot
- M65.18Other infective (teno)synovitis, other site
- M65.19Other infective (teno)synovitis, multiple sites
Related codes at this level
Codes that share M65. If M65.1 is not quite right, the correct code is usually one of these.
Questions about M65.1
- Is M65.1 a billable ICD-10-CM code?
- No. M65.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does M65.1 sit in the tabular list?
- Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Disorders of synovium and tendon (M65-M67).