All ICD10 Codes

Q98

Non-Billable
ChapterQ00–Q99
Rankcategory
Official Description

Other sex chromosome abnormalities, male phenotype, not elsewhere classified

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99).

CH17 Parent Instructions

Excludes2(Not included here)
  • inborn errors of metabolism (E70-E88)

Q90-Q99 Parent Instructions

Excludes2(Not included here)
  • mitochondrial metabolic disorders (E88.4-)

Clinical Hierarchy

CH17Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Q90-Q99Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
Q98Other sex chromosome abnormalities, male phenotype, not elsewhere classified
Q98.0Klinefelter syndrome karyotype 47, XXY
Q98.1Klinefelter syndrome, male with more than two X chromosomes
Q98.3Other male with 46, XX karyotype
Q98.4Klinefelter syndrome, unspecified
Q98.5Karyotype 47, XYY
Q98.6Male with structurally abnormal sex chromosome
Q98.7Male with sex chromosome mosaicism
Q98.8Other specified sex chromosome abnormalities, male phenotype
Q98.9Sex chromosome abnormality, male phenotype, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to Q98:

blockQ90-Q99
Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
View context instructions
chapterCH17
Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to Q98. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

20 raw paths
Abnormal, abnormality, abnormalities3 unique routes
chromosome, chromosomal(3 variants)
sex(3 variants)
male phenotype→Q98(2 variants)
specified NEC→Q98
structural male→Q98
Absence (of) (organ or part) (complete or partial)1 unique routes
sex chromosome
male phenotype→Q98
Anomaly, anomalous (congenital) (unspecified type)3 unique routes
chromosomes, chromosomal(2 variants)
sex(2 variants)
Klinefelter's→Q98
male phenotype→Q98
sex chromosomes NEC
male phenotype→Q98
Karyotype4 unique routes
46,XX→Q98(2 variants)
male→Q98
47,XXY→Q98
47,XYY→Q98
Klinefelter's syndrome3 unique routes
Direct index entry→Q98
karyotype 47,XXY→Q98
male with more than two X chromosomes→Q98
Mosaicism, mosaic (autosomal) (chromosomal)1 unique routes
sex chromosome
male→Q98
Syndrome3 unique routes
due to abnormality
chromosomal
sex
male phenotype→Q98
XXXXY→Q98
XXY→Q98
XXXXY syndrome1 unique routes
Direct index entry→Q98
XXY syndrome1 unique routes
Direct index entry→Q98

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Other sex chromosome abnormalities, male phenotype, not elsewhere classified.

Search PCS Codes