Q99.8 Other specified chromosome abnormalities

Non-billable header with 2 child codes.

Codes under Q99.8

• Q99.81 Usher syndrome
• Q99.89 Other specified chromosome abnormalities

Approximate ICD-9-CM (GEMs)

• 758.81 Other conditions due to sex chromosome anomalies (approximate)
• 758.89 Other conditions due to chromosome anomalies (approximate)

Code annotations containing back-references to Q99.8

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)")

Diagnosis Index entries for Q99.8

• Abnormal, abnormality, abnormalities › chromosome, chromosomal › sex
• Abnormal, abnormality, abnormalities › chromosome, chromosomal › specified NEC
• Additional › chromosome (s)
• Anomaly, anomalous (congenital) (unspecified type) › chromosomes, chromosomal › specified NEC
• Syndrome › due to abnormality › chromosomal › specified NEC
• Translocation › chromosomes NEC

Nearby codes

• Q99 Other chromosome abnormalities, not elsewhere classified
• Q99.0 Chimera 46, XX/46, XY
• Q99.1 46, XX true hermaphrodite
• Q99.2 Fragile X chromosome
• Q99.8 Other specified chromosome abnormalities (this code)
• 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