Blepharoplasty addresses excess eyelid skin (dermatochalasis) and associated eyelid changes such as bagginess, protruding fat, and lax hanging skin. It may be performed for functional reasons when redundant eyelid tissue obstructs vision or for cosmetic reasons when the goal is appearance alone; procedures done solely to improve appearance are considered cosmetic and are not medically necessary. Ptosis (blepharoptosis) is a true drooping of the upper eyelid margin caused by levator or Müller muscle dysfunction, congenital or acquired, and is treated with ptosis repair procedures rather than standard skin-only blepharoplasty. Ectropion and entropion are malpositions of the eyelid (outward or inward turning, respectively) that can lead to conjunctival or corneal exposure, irritation, infection, or ulceration and may require surgical correction when medical management fails or when corneal/conjunctival injury is present.
Objective measures are required to document functional impairment prior to reconstructive eyelid or brow procedures. Superior visual field testing (performed with eyelids in repose and then with the upper lid taped to simulate surgical elevation) is the primary perimetric measure used to quantify obstruction and to demonstrate potential correction. The policy requires a minimum of at least 20 degrees or 30% loss of the upper visual field (recovery of at least that amount with the eyelid taped) for many indications, consistent with guidance that superior field loss of clinical significance is documented by standardized testing.
Another key objective metric is the margin reflex distance 1 (MRD1), the distance from the upper eyelid to the corneal light reflex; normal is about 4–5 mm. For ptosis repair in adults the policy uses an MRD1 threshold of ≤ 2.0 mm as associated with significant visual impairment and as a criterion supporting reconstructive (rather than cosmetic) surgery. Photographic documentation in primary gaze (showing the corneal light reflex and eyelid position) is also required to confirm functional impairment and to support the proposed procedure.
Surgery is considered reconstructive (medically necessary) when functional impairment is documented by these objective findings and when conservative or medical therapies have failed where applicable (for example, botulinum toxin for blepharospasm or nonsurgical measures for ectropion/entropion). Conversely, procedures performed in the absence of documented functional impairment—solely to improve appearance—are classified as cosmetic and are not covered. The policy was reviewed annually with no changes to policy statements (4/15/2024 and 4/15/2025).