Back to ICD-10 library
ICD-10-CM · FY 2026 APRIL UPDATE

M65

Synovitis and tenosynovitis

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
M65.0Abscess of tendon sheathCategory
M65.00Abscess of tendon sheath, unspecified siteBillable
M65.01Abscess of tendon sheath, shoulderCategory
M65.011Abscess of tendon sheath, right shoulderBillable
M65.012Abscess of tendon sheath, left shoulderBillable
M65.019Abscess of tendon sheath, unspecified shoulderBillable
M65.02Abscess of tendon sheath, upper armCategory
M65.021Abscess of tendon sheath, right upper armBillable
M65.022Abscess of tendon sheath, left upper armBillable
M65.029Abscess of tendon sheath, unspecified upper armBillable
M65.03Abscess of tendon sheath, forearmCategory
M65.031Abscess of tendon sheath, right forearmBillable
M65.032Abscess of tendon sheath, left forearmBillable
M65.039Abscess of tendon sheath, unspecified forearmBillable
M65.04Abscess of tendon sheath, handCategory
M65.041Abscess of tendon sheath, right handBillable
M65.042Abscess of tendon sheath, left handBillable
M65.049Abscess of tendon sheath, unspecified handBillable
M65.05Abscess of tendon sheath, thighCategory
M65.051Abscess of tendon sheath, right thighBillable
M65.052Abscess of tendon sheath, left thighBillable
M65.059Abscess of tendon sheath, unspecified thighBillable
M65.06Abscess of tendon sheath, lower legCategory
M65.061Abscess of tendon sheath, right lower legBillable
M65.062Abscess of tendon sheath, left lower legBillable
M65.069Abscess of tendon sheath, unspecified lower legBillable
M65.07Abscess of tendon sheath, ankle and footCategory
M65.071Abscess of tendon sheath, right ankle and footBillable
M65.072Abscess of tendon sheath, left ankle and footBillable
M65.079Abscess of tendon sheath, unspecified ankle and footBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.