H53.423 Scotoma of blind spot area, bilateral

ICD-10-CM Code H53.423: Scotoma of blind spot area, bilateral

ICD-10-CM code H53.423 represents the diagnosis of a scotoma of the blind spot area, bilateral. This active terminology concept is classified as a finding and falls under the parent concept H53.42. Clinical literature describes visual field testing methods that identify scotomas and locate the blind spot. 1 2

Plain-language overview

A scotoma is an area of perceived visual field loss where a rapidly moving light may appear interrupted, and the blind spot is a specific region shown in white within the visual field. 2

What this code represents

The official preferred name for ICD-10-CM code H53.423 is scotoma of blind spot area, bilateral, and the terminology record assigns this active code a semantic type of finding. 1

Coding details

Within the ICD-10-CM hierarchy, code H53.423 is a narrower concept that descends from the parent concept H53.42, which denotes a scotoma of the blind spot area. 1

Code H53.423 is designated as a diagnosis code, and it appears alongside the related left eye code H53.422 and the unspecified code H53.429 in a health outcome algorithm. 4

Clinical context

In glaucoma screening, early visual field defects may present as small paramacular scotomas in the Bjerrum area that can form an arcuate connection to the blind spot. 2

Rapid campimetry extends the visual field temporally to fifteen degrees adjacent to the blind spot area to ensure the patient understands the testing principle by signaling the disappearance of a dot. 2

Documentation considerations

The official terminology record for H53.423 specifies a bilateral condition and provides the published abbreviation as scotoma of blind spot area, bilateral. 1

What the sources add

While the terminology record provides the official code definition and hierarchy, the clinical literature adds operational context by describing how visual field defects near the blind spot are physically located during testing. 1 2

Coverage and utilization context

Code H53.423 appears alongside related unilateral and unspecified scotoma codes in a health outcome algorithm document, establishing its inclusion in this specific surveillance specification. 4

Sources

1. ICD-10-CM H53.423 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Rapid Campimetry—A Novel Screening Method for Glaucoma Diagnosis — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Phecode 368.4 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-27.
4. Disclaimer — sentinelinitiative.org; accessed 2026-07-27.