Q99.818 Other Usher syndrome

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.

Applicable to

• Usher syndrome, type 4

Applies from Q99.81 Usher syndrome

Use additional code

• code to identify any auditory and visual manifestations

MS-DRG index

Defines the logic of DRG(s) 564-566 in MDC 08.

Code annotations containing back-references to Q99.818

Back-references to Q99

• Code First: D84.81 Immunodeficiency due to conditions classified elsewhere ("chromosomal abnormalities (Q90-Q99)")
• Type 1 Excludes: E25 Adrenogenital disorders ("chromosomal abnormalities (Q90-Q99)")
• Type 2 Excludes: P04 Newborn affected by noxious substances transmitted via placenta or breast milk ("congenital malformations (Q00-Q99)")
• Type 1 Excludes: Q56 Indeterminate sex and pseudohermaphroditism ("pseudohermaphroditism with specified chromosomal anomaly (Q96-Q99)")
• Type 1 Excludes: Z15 Genetic susceptibility to disease ("chromosomal anomalies (Q90-Q99)")

Nearby codes

• Q99.8 Other specified chromosome abnormalities
• Q99.81 Usher syndrome
• Q99.811 Usher syndrome, type 1
• Q99.812 Usher syndrome, type 2
• Q99.813 Usher syndrome, type 3
• Q99.818 Other Usher syndrome (this code)
• Q99.819 Usher syndrome, unspecified
• Q99.89 Other specified chromosome abnormalities
• Q99.9 Chromosomal abnormality, unspecified