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.

Documentation tips

What should appear in the chart to support M92.61.

Source · Editorial brief grounded in 6 cited references ↓

• Specify laterality explicitly as 'right ankle' or 'right tarsus' — do not use 'affected side' or leave side undocumented, which forces a drop to M92.60 (unspecified).
• Identify the specific tarsal bone involved (e.g., navicular, calcaneus, os tibiale externum) to support clinical specificity and defend the diagnosis against audit queries.
• Record the patient's age and skeletal maturity status — this is a juvenile osteochondrosis code and is inappropriate for skeletally mature adults.
• Document imaging findings that support the diagnosis: plain radiograph findings (fragmentation, sclerosis, flattening of tarsal ossification centers), MRI signal changes, or bone scan results.
• Note whether conservative treatment has been attempted (activity restriction, orthotics, casting) to substantiate medical necessity for further workup or intervention.

Related CPT procedures

Procedure codes commonly billed with M92.61. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M92.61 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Assigning M92.61 to an adult patient: this code is restricted to juvenile (pediatric/adolescent) osteochondrosis — use M93.x or other adult osteochondropathy codes for mature patients.
• Using M92.61 alone to represent bilateral tarsal osteochondrosis — bilateral cases require both M92.61 (right) and M92.62 (left), since no standalone bilateral code exists under M92.6.
• Defaulting to M92.60 (unspecified ankle) when the chart clearly documents right-sided involvement — always capture the documented laterality.
• Confusing tarsal osteochondrosis (M92.6x) with metatarsal osteochondrosis (M92.7x) — confirm the anatomical location before selecting between these sibling categories.
• Applying a 7th-character extension to M92.61 — M-codes do not use 7th-character trauma extensions (A/D/S); those apply to S-codes only.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

Sibling codes

Other billable codes under M92.6 (laterality / anatomic variants).