2024 ICD-10-CM Diagnosis Code M21.6X9

Other acquired deformities of unspecified foot

ICD-10-CM Code:
M21.6X9
ICD-10 Code for:
Other acquired deformities of unspecified foot
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

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

M21.6X9 is a billable diagnosis code used to specify a medical diagnosis of other acquired deformities of unspecified foot. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like M21.6X9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Abduction deformity of foot
  • Absent bone in foot
  • Acquired abduction deformity of foot
  • Acquired adduction deformity of foot
  • Acquired cavovarus deformity of foot
  • Acquired cavus deformity of foot
  • Acquired dorsiflexed first ray
  • Acquired dorsiflexed forefoot
  • Acquired dorsiflexion deformity of foot
  • Acquired equinus deformity of foot
  • Acquired forefoot abductus
  • Acquired forefoot adductus
  • Acquired metatarsus adductus
  • Acquired plantar-flexed fifth ray
  • Acquired plantar-flexed first ray
  • Acquired plantar-flexed forefoot
  • Acquired pronated forefoot
  • Acquired pronation deformity of foot
  • Acquired serpentine deformity of foot
  • Acquired supination deformity of foot
  • Acquired supination deformity of forefoot
  • Adductus deformity of foot
  • Angulation of bone in foot
  • Bowing of foot bone
  • Calcaneovalgus deformity of foot
  • Cavovarus deformity of foot
  • Correction of low arch on tiptoe
  • Defect of articular cartilage
  • Deformity of bone in foot
  • Deformity of metatarsal
  • Dorsiflexion deformity of foot
  • Finding of movement of foot
  • Forefoot adductus
  • Loss of protective sensation of skin
  • Osteochondral defect of talus
  • Peripheral vascular disease of foot with loss of protective sensation and deformity
  • Plantar flexion deformity of midtarsal joint
  • Plantarflexion deformity of foot
  • Postural calcaneovalgus
  • Pronated forefoot
  • Pronation deformity of the foot
  • Pronation of foot
  • Shortening of bone in foot
  • Supination deformity of foot
  • Supination deformity of forefoot
  • Talar tilt
  • Toeing-out

Clinical Classification

Convert M21.6X9 to ICD-9-CM

  • ICD-9-CM Code: 736.79 - Acq ankle-foot def NEC
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education


Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:

  • Bunions - hard, painful bumps on the big toe joint
  • Corns and calluses - thickened skin from friction or pressure
  • Plantar warts - warts on the soles of your feet
  • Fallen arches - also called flat feet

Ill-fitting shoes often cause these problems. Aging and being overweight also increase your chances of having foot problems.


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.