M65.962 ICD-10-CM Code: Unspecified synovitis and tenosynovitis, left lower leg
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Disorders of synovium and tendon (M65-M67)
M65.962
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceUnspecified synovitis and tenosynovitis, left lower leg
Inflammation of the tissue lining the tendons in the left lower leg, cause unknown. This causes pain and swelling below the knee.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for M65.962 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for M65.962 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M65.962 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for M65.962 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for M65.962 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for M65.962 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for M65.962 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is M65.962 an HCC code?
No. M65.962 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- M65.962
- Description
- Unspecified synovitis and tenosynovitis, left lower leg
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
Get the V28 RAF + MEAT cheat sheet
One printable page: confirm a code's V28 HCC status, its RAF weight, and the MEAT your note needs to make it stick. Free, no card.
Free PDF. No card. Unsubscribe anytime.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
M65.962 is the ICD-10-CM diagnosis code for unspecified synovitis and tenosynovitis, left lower leg. Inflammation of the tissue lining the tendons in the left lower leg, cause unknown. This causes pain and swelling below the knee. M65.962 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering disorders of synovium and tendon (m65-m67).
M65.962 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify left lower leg is clearly documented in the clinical record.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M65.962 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify left lower leg is clearly documented in the clinical record
- •Note whether the condition involves the anterior tibialis, gastrocnemius, or other lower leg tendons