Non-Billable / Non-Specific Code
ICD-10-CM M65 is the diagnosis code for Synovitis and tenosynovitis. This code falls under the section "Disorders of synovium and tendon" within Chapter 13 — Diseases of the musculoskeletal system and connective tissue (M00-M99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as M65. They are mutually exclusive:
Understanding where M65 sits in the ICD-10-CM classification helps ensure proper coding:
No, M65 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
M65 is the ICD-10-CM diagnosis code for "Synovitis and tenosynovitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
M65 is located in Section M65-M67 — "Disorders of synovium and tendon" within Chapter 13 of the ICD-10-CM Tabular List.
M65 has 7 sub-code(s) that provide more specific detail: M65.0, M65.1, M65.2, M65.3, M65.4 and more.
Use M65 when the patients documented diagnosis matches "Synovitis and tenosynovitis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Synovitis and tenosynovitis is M65.
No, M65 is non-billable. Use a more specific sub-code for primary diagnosis billing.
M65 is in Chapter 13 of the ICD-10-CM Tabular List.
Type 1 Excludes for M65 include: 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.-).
Yes, M65 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.