Foot & ankle ICD-10 codes

Acquired lateral deviation of the great toe (hallux valgus / bunion) where the treating clinician has not documented or cannot determine which foot is affected.

M20.11 identifies an acquired lateral deviation of the great toe at the first metatarsophalangeal joint, confirmed on the right foot, resulting from structural changes rather than a congenital condition.

Acquired lateral deviation of the left great toe at the first metatarsophalangeal joint, commonly presenting as a visible medial bony prominence (bunion) of the left foot.

Hallux rigidus of an unspecified foot — stiffness and limited dorsiflexion at the first metatarsophalangeal joint due to degenerative or acquired changes, coded when chart documentation does not specify right or left.

Degenerative arthritis of the right first metatarsophalangeal (MTP) joint causing progressive loss of dorsiflexion range of motion, classified as an acquired deformity of the toe under ICD-10-CM Chapter 13.

Degenerative arthritis of the left first metatarsophalangeal (MTP) joint causing progressive stiffness and loss of dorsiflexion, classified as an acquired deformity under ICD-10-CM chapter M20.

Acquired medial deviation of the great toe at the first metatarsophalangeal joint, laterality not documented or not specified by the treating provider.

Acquired medial deviation of the right great toe, where the hallux angles toward the midline of the body — the opposite direction from hallux valgus — resulting from post-surgical, traumatic, or inflammatory causes rather than congenital malformation.

Acquired medial deviation of the left great toe at the first metatarsophalangeal joint, resulting from a non-congenital cause such as prior surgery, trauma, or inflammatory arthritis.

Acquired hammer toe deformity affecting one or more lesser toes, with laterality not documented or unspecified in the medical record.

M20.41 identifies an acquired hammertoe deformity affecting one or more lesser toes of the right foot, distinguished from congenital deformities and from deformities of the great toe.

M20.42 identifies an acquired hammer toe deformity affecting one or more toes of the left foot, distinguished from congenital deformity by its post-birth onset.

M20.60 classifies an acquired deformity of one or more toes where neither the specific deformity type nor the affected foot (right or left) is documented.

M20.61 identifies an acquired deformity affecting one or more toes of the right foot where the specific deformity type is not documented or does not fit a more precise subcategory.

M20.62 captures an acquired deformity of one or more toes of the left foot where the specific deformity type is not documented or does not map to a more precise code in the M20 series.

Acquired flat foot (pes planus) affecting an unspecified foot — meaning laterality was not documented or cannot be determined from the record.

Acquired collapse of the medial longitudinal arch of the right foot, coded specifically when pes planus developed after birth due to injury, tendon dysfunction, arthritis, or other acquired cause — not a structural anomaly present at birth.

Acquired collapse of the medial longitudinal arch of the left foot, documented as developing after birth due to an identifiable cause such as posterior tibial tendon dysfunction, trauma, or arthritis — not a congenital structural variant.

Acquired shortening of the Achilles tendon at an unspecified ankle, classified under other disorders of synovium and tendon. Use only when the affected side is not documented.

Acquired shortening of the Achilles tendon at the right ankle, classified under other disorders of synovium and tendon (M67), distinct from congenital or traumatic rupture etiologies.

Acquired shortening of the Achilles tendon at the left ankle, classified as a non-traumatic soft tissue disorder under ICD-10-CM category M67.0.

Achilles tendinitis or Achilles bursitis affecting an unspecified leg — use only when the clinical note fails to document right or left laterality.

M76.61 identifies inflammatory or degenerative pathology of the Achilles tendon localized to the right leg, classified under lower-limb enthesopathies (M76). Per the ICD-10-CM Tabular List, Achilles bursitis of the right side maps here as well.

Achilles tendinitis of the left leg — inflammation of the left Achilles tendon, classified under lower-limb enthesopathies (M76), also covering left Achilles bursitis per the Applicable To note at the M76.6 parent level.

M76.70 identifies peroneal tendinitis when the treating provider has not specified whether the affected leg is right or left. It covers chronic, overuse-driven inflammation of the peroneal tendons without a documented laterality.

M76.71 identifies inflammation of the peroneal tendons (peroneus longus and/or brevis) along the lateral aspect of the right lower leg, classified as a lower-limb enthesopathy under the musculoskeletal chapter.

Inflammatory condition of the peroneal tendons (peroneus longus and/or brevis) localized to the left lower leg, classified as an enthesopathy of the lower limb excluding the foot.

M77.30 identifies a calcaneal spur — a bony outgrowth on the inferior surface of the heel bone — when the affected foot is not specified in the documentation as right or left.

A bony projection arising from the calcaneus of the right foot, classified as an enthesopathy under ICD-10-CM Chapter 13 (Diseases of the musculoskeletal system and connective tissue).

A bony outgrowth (osteophyte) arising from the calcaneus of the left foot, classified under enthesopathies and other soft tissue disorders of the lower extremity.

Pain in the metatarsal region of an unspecified foot, encompassing discomfort in the metatarsal bones, metatarsophalangeal joints, and/or intermetatarsal joints without documented laterality.

Pain localized to the metatarsal head region of the right foot, classified under enthesopathies and other soft tissue disorders of the foot.

M77.42 classifies metatarsalgia localized to the left foot — pain and inflammation at the metatarsal heads, typically aggravated by weight-bearing and tight footwear.

M77.50 classifies enthesopathy affecting tendon or ligament insertion points at the foot and/or ankle when the laterality (right vs. left) is not documented in the medical record.

M77.51 captures enthesopathy affecting tendon and ligament insertion sites of the right foot and ankle — excluding plantar fasciitis, Achilles enthesopathy, and calcaneal spur, which have their own dedicated codes.

M77.52 identifies enthesopathy affecting the tendon or ligament insertion sites of the left foot and ankle, excluding plantar fasciitis, Achilles tendinitis, and other named enthesopathies with dedicated codes.

M92.60 captures juvenile osteochondrosis affecting the tarsal bones when the affected ankle is not specified as right or left in the documentation.

M92.61 identifies juvenile osteochondrosis affecting the tarsal bones of the right ankle — a disorder of endochondral ossification occurring during skeletal growth in children and adolescents.

Juvenile osteochondrosis affecting the tarsal bones of the left ankle — a growth-related disruption of blood supply to one or more tarsal ossification centers in a skeletally immature patient.

M92.70 identifies juvenile osteochondrosis of the metatarsus when foot laterality has not been documented. It captures avascular necrosis or osteochondrosis of the metatarsal bones in a skeletally immature patient, including both Freiberg disease (second metatarsal) and Iselin disease (fifth metatarsal), when the provider's note does not specify right or left foot.

Juvenile osteochondrosis of the metatarsus, right foot — avascular necrosis or disrupted ossification affecting one or more metatarsal bones in a skeletally immature patient on the right side.

Juvenile osteochondrosis affecting the metatarsal bones of the left foot, classified under the category of other juvenile osteochondroses (M92), representing avascular necrosis or abnormal ossification of the metatarsal head(s) in a skeletally immature patient.

Narrowing of the neural canal in the lower extremity caused by a subluxation — a partial dislocation or biomechanical displacement — that mechanically compresses the neural passageway in that region.

M99.56 identifies intervertebral disc stenosis of the neural canal specifically attributed to biomechanical lesion at the lower extremity region, classified under the M99 biomechanical lesions category.

M72.2 covers fibroblastic thickening of the plantar fascia, encompassing both plantar fascial fibromatosis (Ledderhose disease, with palpable nodules) and the far more common plantar fasciitis.