Non-Billable / Non-Specific Code
ICD-10-CM M21.8 is the diagnosis code for Other specified acquired deformities of limbs. 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 are not included in M21.8. If the patient has both, code each condition separately:
Understanding where M21.8 sits in the ICD-10-CM classification helps ensure proper coding:
No, M21.8 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
M21.8 is the ICD-10-CM diagnosis code for "Other specified acquired deformities of limbs". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M21.8 is M21 ("Other acquired deformities of limbs"). M21.8 provides a more specific classification within this category.
M21.8 is located in Section M20-M25 â "Other joint disorders" within Chapter 13 of the ICD-10-CM Tabular List.
M21.8 has 5 sub-code(s) that provide more specific detail: M21.80, M21.82, M21.83, M21.85, M21.86.
Use M21.8 when the patients documented diagnosis matches "Other specified acquired deformities of limbs" 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 Other specified acquired deformities of limbs is M21.8.
No, M21.8 is non-billable. Use a more specific sub-code for primary diagnosis billing.
M21.8 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M21.8 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.