ICD-10-CM Code M21.37

Not Valid for Submission

M21.37 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of foot drop (acquired). The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code M21.37 are found in the index:

• - Deformity - Q89.9
  • - limb (acquired) - M21.90
    • - foot
      • - drop - M21.37

Clinical Information

• PERONEAL NEUROPATHIES-. disease involving the common peroneal nerve or its branches the deep and superficial peroneal nerves. lesions of the deep peroneal nerve are associated with paralysis of dorsiflexion of the ankle and toes and loss of sensation from the web space between the first and second toe. lesions of the superficial peroneal nerve result in weakness or paralysis of the peroneal muscles which evert the foot and loss of sensation over the dorsal and lateral surface of the leg. traumatic injury to the common peroneal nerve near the head of the fibula is a relatively common cause of this condition. from joynt clinical neurology 1995 ch51 p31

Code Classification

• Diseases of the musculoskeletal system and connective tissue (M00–M99)
  • Other joint disorders (M20-M25)
    • Other acquired deformities of limbs (M21)

Code History

• FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
  (First year ICD-10-CM implemented into the HIPAA code set)
• FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
• FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
• FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
• FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

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