H51.21 Internuclear ophthalmoplegia, right eye

Billable ICD-10-CM code, FY2026.

MS-DRG index

Defines the logic of DRG(s) 091-093 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 378.86 Internuclear ophthalmoplegia (approximate)

Code annotations containing back-references to H51.21

Back-references to H51.2

• Type 2 Excludes: H49 Paralytic strabismus ("internuclear ophthalmoplegia (H51.2-)")

Nearby codes

• H51.1 Convergence insufficiency and excess
• H51.11 Convergence insufficiency
• H51.12 Convergence excess
• H51.2 Internuclear ophthalmoplegia
• H51.20 Internuclear ophthalmoplegia, unspecified eye
• H51.21 Internuclear ophthalmoplegia, right eye (this code)
• H51.22 Internuclear ophthalmoplegia, left eye
• H51.23 Internuclear ophthalmoplegia, bilateral
• H51.8 Other specified disorders of binocular movement
• H51.9 Unspecified disorder of binocular movement