Q96.4 Mosaicism, 45, X/other cell line(s) with abnormal sex chromosome

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Q96 Turner's syndrome

Excludes1 (never code together)

• Noonan syndrome (Q87.19)

MS-DRG index

Defines the logic of DRG(s) 742-743 in MDC 13.

Approximate ICD-9-CM (GEMs)

• 758.6 Gonadal dysgenesis (approximate)

Code annotations containing back-references to Q96.4

Back-references to Q96

• 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 1 Excludes: E28.3 Primary ovarian failure ("Turner's syndrome (Q96.-)")
• Type 1 Excludes: Q50.0 Congenital absence of ovary ("Turner's syndrome (Q96.-)")
• Type 1 Excludes: Q56 Indeterminate sex and pseudohermaphroditism ("pseudohermaphroditism with specified chromosomal anomaly (Q96-Q99)")
• Type 1 Excludes: Q97 Other sex chromosome abnormalities, female phenotype, not elsewhere classified ("Turner's syndrome (Q96.-)")
• Type 1 Excludes: Z15 Genetic susceptibility to disease ("chromosomal anomalies (Q90-Q99)")

Diagnosis Index entries for Q96.4

• Mosaicism, mosaic (autosomal) (chromosomal) › 45,X/other cell lines NEC with abnormal sex chromosome

Nearby codes

• Q96 Turner's syndrome
• Q96.0 Karyotype 45, X
• Q96.1 Karyotype 46, X iso (Xq)
• Q96.2 Karyotype 46, X with abnormal sex chromosome, except iso (Xq)
• Q96.3 Mosaicism, 45, X/46, XX or XY
• Q96.4 Mosaicism, 45, X/other cell line(s) with abnormal sex chromosome (this code)
• Q96.8 Other variants of Turner's syndrome
• Q96.9 Turner's syndrome, unspecified