All ICD10 Codes

M65

Non-Billable
ChapterM00–M99
Rankcategory
Official Description

Synovitis and tenosynovitis

Use a more specific code (1 billable, 6 non-billable)
M65.0Abscess of tendon sheathhas subcodesM65.1Other infective (teno)synovitishas subcodesM65.2Calcific tendinitishas subcodesM65.3Trigger fingerhas subcodesM65.4Radial styloid tenosynovitis [de Quervain]M65.8Other synovitis and tenosynovitishas subcodesM65.9Synovitis and tenosynovitis, unspecifiedhas subcodes
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

CH13 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Instructional Notes

Excludes1(Not coded here. Use a different 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.-)

Clinical Hierarchy

BillableHas subcodes
CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M65-M67Disorders of synovium and tendon (M65-M67)
M65Synovitis and tenosynovitisNot billable
M65.0Abscess of tendon sheathSubcodes
M65.1Other infective (teno)synovitisSubcodes
M65.2Calcific tendinitisSubcodes
M65.3Trigger fingerSubcodes
M65.4Radial styloid tenosynovitis [de Quervain]Billable
M65.8Other synovitis and tenosynovitisSubcodes
M65.9Synovitis and tenosynovitis, unspecifiedSubcodes

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M65:

chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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