Non-Billable / Non-Specific Code
ICD-10-CM M23 is the diagnosis code for Internal derangement of knee. This code falls under the section "Other joint disorders" within Chapter 13 â 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 M23. They are mutually exclusive:
The following conditions are not included in M23. If the patient has both, code each condition separately:
Understanding where M23 sits in the ICD-10-CM classification helps ensure proper coding:
No, M23 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
M23 is the ICD-10-CM diagnosis code for "Internal derangement of knee". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
M23 is located in Section M20-M25 â "Other joint disorders" within Chapter 13 of the ICD-10-CM Tabular List.
M23 has 8 sub-code(s) that provide more specific detail: M23.0, M23.2, M23.3, M23.4, M23.5 and more.
Use M23 when the patients documented diagnosis matches "Internal derangement of knee" 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 Internal derangement of knee is M23.
No, M23 is non-billable. Use a more specific sub-code for primary diagnosis billing.
M23 is in Chapter 13 of the ICD-10-CM Tabular List.
Type 1 Excludes for M23 include: ankylosis (M24.66); deformity of knee (M21.-); osteochondritis dissecans (M93.2).
Yes, M23 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.