ICD-10 diagnosis code

M65 Synovitis and tenosynovitis

M65 is the ICD-10 code for Synovitis and tenosynovitis. It is a three-character category divided into 7 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block M65–M68 (Disorders of synovium and tendon) in Chapter XIII, Diseases of the musculoskeletal system and connective tissue.

Code type: Category (3 characters)
Chapter: XIII · M00–M99
Classification: WHO ICD-10, 2019 version

What M65 excludes

Conditions that look similar but belong under another code.

chronic crepitant synovitis of hand and wrist M70.0
current injury - see injury of ligament or tendon by body region
soft tissue disorders related to use, overuse and pressure M70.-

Subcodes of M65

M65 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

M65Synovit och tenosynovit (inflammation i ledhinnor och senor)

DenmarkICD-10-DK

DM65Betændelse i ledkapselhinde og seneskede

FinlandICD-10-FI

M65Nivelkalvon tai jännetupen tulehdus

GermanyICD-10-GM

M65Synovitis und Tenosynovitis

FranceICD-10-FR

M65Synovite et ténosynovite

NetherlandsICD-10-NL

M65synoviitis en tendovaginitis

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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