Alphabetic Index FY2027

M21.2

Flexion deformity

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M20–M25 Other joint disorders

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

M21.2 is a non-billable ICD-10-CM code header for flexion deformity. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M21.20 Flexion deformity, unspecified site; M21.21 Flexion deformity, shoulder; M21.22 Flexion deformity, elbow; M21.23 Flexion deformity, wrist and 4 more. Its coding notes include 3 Excludes1 entries and 13 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from M21 Other acquired deformities of limbs
  • acquired absence of limb (Z89.-)
  • congenital absence of limbs (Q71-Q73)
  • congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from M21 Other acquired deformities of limbs
  • acquired deformities of fingers or toes (M20.-)
  • coxa plana (M91.2)
Also from chapter/block level (11 notes)
Inherited from M20–M25 Other joint disorders
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More specific codes under M21.2 8