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ICD-10-CM H53.421: Scotoma of blind spot area, right eye
ICD-10-CM code H53.421 denotes scotoma of the blind spot area, right eye. A scotoma is an area of poor vision surrounded by relatively better vision, and the blind spot corresponds anatomically to the optic disk. This code is distinct from central scotoma codes and is listed within the H53.42 category. 1 3 4
Plain-language overview
A scotoma is defined as an area of poor vision surrounded on all sides by relatively better vision. The normal blind spot corresponds anatomically to the scleral canal where retinal nerve fibers leave the eye at the optic disk. 1
What this code represents
ICD-10-CM code H53.421 is labeled Scotoma of blind spot area, right eye. It is listed within the H53.42 category for scotoma of blind spot area, alongside codes for left eye, bilateral, and unspecified eye. 3 4
Coding details
The ICD-10-CM code set distinguishes H53.421 for the right eye from H53.422 for the left eye, H53.423 for bilateral, and H53.429 for an unspecified eye. This provides laterality specificity for scotoma of the blind spot area. 4
H53.421 is distinct from codes for scotoma involving the central area. The central area scotoma codes include H53.411 for the right eye, H53.412 for the left eye, and H53.413 for bilateral presentation. 4
Documentation considerations
Clinical evaluation of the blind spot involves examining the central field within 30 degrees from fixation to determine the size of the blind spot. The blind spot is represented on a visual field chart by an absolute scotoma. 1
What the sources add
The VSAC code system listing provides the official ICD-10-CM label and category hierarchy for H53.421, while the Sentinel Initiative document lists the code alongside its ICD-9-CM predecessor, 368.42, and related ICD-10-CM scotoma codes. 3 4
The NCBI Bookshelf source provides clinical context for visual field testing, whereas the VSAC and Sentinel sources provide code mapping and structural relationships. None of these sources address payer-specific coverage criteria. 1 3 4
Sources
- Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-25.
- Phecode 368 · Cancer PRSweb — csg.sph.umich.edu; accessed 2026-07-25.
- Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-25.
- Disclaimer — sentinelinitiative.org; accessed 2026-07-25.
Medical Policies and Guidelines
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H53.421 policy automation walkthrough
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