M65.98 — Unspecified synovitis and tenosynovitis, other site
M65.98 is a billable, specific ICD-10-CM code for unspecified synovitis and tenosynovitis, other site. It is valid for submission on a claim.
Risk adjustment
M65.98 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.
Medicare coverage
M65.98 is named in 13 Medicare coverage policies — 7 listing it as supporting medical necessity, and 6 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A58865Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A58893Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A59374Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A59434Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
How M65.98 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to M65.98.
- Synovitis›specified site, unspecified type
Related codes at this level
Codes that share M65.9. If M65.98 is not quite right, the correct code is usually one of these.
- M65.90Unspecified synovitis and tenosynovitis, unspecified site
- M65.91Unspecified synovitis and tenosynovitis, shoulder
- M65.92Unspecified synovitis and tenosynovitis, upper arm
- M65.93Unspecified synovitis and tenosynovitis, forearm
- M65.94Unspecified synovitis and tenosynovitis, hand
- M65.95Unspecified synovitis and tenosynovitis, thigh
- M65.96Unspecified synovitis and tenosynovitis, lower leg
- M65.97Unspecified synovitis and tenosynovitis, ankle and foot
- M65.99Unspecified synovitis and tenosynovitis, multiple sites
Questions about M65.98
- Is M65.98 a billable ICD-10-CM code?
- Yes. M65.98 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does M65.98 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).