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M21.379BillableSave

M21.379 - Foot drop, unspecified foot

ICD-10-CM Chapter 13: Diseases of the musculoskeletal system and connective tissue · M20-M25 Other joint disorders (M20-M25) · Subcategory of M21.37 · FY2027

Includes, Excludes and Coding Notes

Excludes 1 — Not Coded HereFrom M21

Mutually exclusive: these conditions are never reported together with this code.

  • acquired absence of limb (Z89.-)
  • congenital absence of limbs (Q71-Q73)
  • congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
Excludes 2 — Not Included HereFrom M21

Not part of this code; report both codes when the patient has both conditions.

  • acquired deformities of fingers or toes (M20.-)
  • coxa plana (M91.2)
Excludes 2 — Not Included HereFrom M20-M25 Other joint disorders (M20-M25)

Not part of this code; report both codes when the patient has both conditions.

  • joints of the spine (M40-M54)
Excludes 2 — Not Included HereFrom Chapter M00-M99

Not part of this code; report both codes when the patient has both conditions.

  • 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)
NotesFrom Chapter M00-M99

Instructional notes from the ICD-10-CM tabular list.

  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with M21.379.