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.

Documentation tips

What should appear in the chart to support M76.62.

Source · Editorial brief grounded in 6 cited references ↓

• Explicitly name the affected side — 'left Achilles tendinitis' — not just 'Achilles pain' or 'bilateral symptoms'; unspecified laterality forces M76.60 and may trigger payer queries.
• Record the anatomic location of tenderness (e.g., 3–5 cm proximal to calcaneal insertion) to distinguish mid-substance tendinitis from insertional tendinitis and support the M76.62 selection over M77.5- codes.
• Document imaging findings that support the diagnosis — ultrasound showing tendon thickening, MRI demonstrating fusiform enlargement without full-thickness tear — to satisfy medical necessity for injections billed under CPT 20550.
• Note objective clinical findings: tenderness on palpation, painful arc sign, and results of single-leg heel-raise testing. These support clinical validation if the claim is audited.
• Document any prior conservative treatment attempted (physical therapy, NSAIDs, orthotics) when billing injection procedures — payers commonly require documented conservative care failure for M76.62-linked injection claims.

Related CPT procedures

Procedure codes commonly billed with M76.62. 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 M76.62 and adjacent codes.

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

• Using M76.62 for an acute Achilles rupture or strain — acute traumatic injuries require an S86.01x- code with the appropriate 7th character (A, D, or S), not an M-code enthesopathy.
• Coding M76.62 when the note documents only 'Achilles tendinitis' without laterality — the unspecified code M76.60 is required; do not assume left based on prior encounters.
• Confusing Achilles bursitis with retrocalcaneal bursitis coded elsewhere — M76.62 covers left Achilles bursitis per the Applicable To note at M76.6, but verify the provider's specific bursitis terminology before selecting this code.
• Selecting M76.62 for insertional tendinitis at the calcaneal attachment when the clinical findings and payer policy may indicate a foot enthesopathy under M77.5- — clarify anatomic location with the provider.
• Failing to update from M76.60 (unspecified) to M76.62 (left) at a follow-up visit once laterality is documented in the record.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

Sibling codes

Other billable codes under M76.6 (laterality / anatomic variants).