M21.6X9
✓ Billable
Other acquired deformities of unspecified foot
ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue
Code
M21.6X9
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Musculoskeletal System and Connective Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code M21.6X9?
ICD-10-CM code M21.6X9 represents Other acquired deformities of unspecified foot. It is a billable diagnosis code in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is M21.6X9 billable?
Yes. M21.6X9 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is M21.6X9 in?
M21.6X9 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.
Related codes in the M21 category
M21
Other acquired deformities of limbs
Non-billable
M21.0
Valgus deformity, not elsewhere classified
Non-billable
M21.1
Varus deformity, not elsewhere classified
Non-billable
M21.2
Flexion deformity
Non-billable
M21.3
Wrist or foot drop (acquired)
Non-billable
M21.4
Flat foot [pes planus] (acquired)
Non-billable
M21.5
Acquired clawhand, clubhand, clawfoot and clubfoot
Non-billable
M21.6
Other acquired deformities of foot
Non-billable
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