M21.20
Billable codeFlexion deformity, unspecified site
The ICD-10 code for flexion deformity, unspecified site is M21.20.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- M21.21Flexion deformity, shouldernon-billable header
- M21.22Flexion deformity, elbownon-billable header
- M21.23Flexion deformity, wristnon-billable header
- M21.24Flexion deformity, finger jointsnon-billable header
- M21.25Flexion deformity, hipnon-billable header
- M21.26Flexion deformity, kneenon-billable header
- M21.27Flexion deformity, ankle and toesnon-billable header
- M21.20Flexion deformity, unspecified site
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 73689Approximate match
Associated MS-DRGs
M21.20 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.