Medicare covers IOL calculation procedures for patients about to undergo cataract surgery. But just listing 366.x (Cataract) as your diagnosis code is likely to get your claim rejected.
Below is a list of specific ICD-9 codes that most carriers recognize as demonstrating medical necessity for both 76519 (Ophthalmic biometry by ultrasound echography, A-scan; with intraocular lens power calculation) and 92136 (Ophthalmic biometry by partial coherence interferometry with intraocular lens power calculation):
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366.00-366.04 — Infantile, juvenile and presenile cataract
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366.13-366.19 — Senile cataract
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366.20 — Traumatic cataract, unspecified
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366.22 — Total traumatic cataract
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366.30 — Cataracta complicata, unspecified
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366.32 — Cataract in inflammatory disorders
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366.33 — Cataract with neovascularization
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366.34 — Cataract in degenerative disorders
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366.41-366.46 — Cataract associated with other disorders
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379.31-379.34 — Aphakia and other disorders of lens
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743.30-743.39 — Congenital cataract and lens anomalies
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996.53 — Mechanical complication of prosthetic device; due to ocular lens prosthesis
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V43.1 — Lens replaced by other means.
Be sure to check with your own local carrier for specific coverage rules.