DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

Q98 Other sex chromosome abnormalities, male phenotype, not elsewhere classified

  • Header · not billable

Q98 is not billable. The category heads 9 billable codes in FY2027: the 9 codes directly below it.

Index → code

  • XXY syndrome → Q98.0
  • XXXXY syndrome → Q98.1
  • Klinefelter's syndrome → Q98.4

Where it sits

  1. Chapter 17 Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
  2. Q90-Q99 Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
  3. Q98 Other sex chromosome abnormalities, male phenotype, not elsewhere classified
Billable codes
9
Subdivisions
9
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
20

Codes in Q98

  1. Q98.0
    Klinefelter syndrome karyotype 47, XXY
    BillableExempt
  2. Q98.1
    Klinefelter syndrome, male with more than two X chromosomes
    BillableExempt
  3. Q98.3
    Other male with 46, XX karyotype
    BillableExempt
  4. Q98.4
    Klinefelter syndrome, unspecified
    BillableExempt
  5. Q98.5
    Karyotype 47, XYY
    BillableExempt
  6. Q98.6
    Male with structurally abnormal sex chromosome
    BillableExempt
  7. Q98.7
    Male with sex chromosome mosaicism
    BillableExempt
  8. Q98.8
    Other specified sex chromosome abnormalities, male phenotype
    BillableExempt
  9. Q98.9
    Sex chromosome abnormality, male phenotype, unspecified
    BillableExempt

Sources of each column.

Instructions

Notes that also apply

Block Q90-Q99 instructions (Excludes2 1): printed on the block page.

Chapter 17 instructions (Notes 1, Excludes2 1): printed on the chapter 17 page.

Index entries

  • XXY syndrome → Q98.0
  • XXXXY syndrome → Q98.1
  • Klinefelter's syndrome → Q98.4
  • Karyotype47,XXY → Q98.0
  • Klinefelter's syndromekaryotype 47,XXY → Q98.0
  • SyndromeXXY → Q98.0
  • Klinefelter's syndromemale with more than two X chromosomes → Q98.1
  • SyndromeXXXXY → Q98.1
  • Karyotype46,XX → Q98.3
  • Karyotype47,XYY → Q98.5
  • Karyotype46,XXmale → Q98.3
  • Mosaicism, mosaic (autosomal) (chromosomal)sex chromosomemale → Q98.7
  • Absence (of) (organ or part) (complete or partial)sex chromosomemale phenotype → Q98.8
  • Anomaly, anomalous (congenital) (unspecified type)sex chromosomes NECmale phenotype → Q98.9
  • Anomaly, anomalous (congenital) (unspecified type)chromosomes, chromosomalsexKlinefelter's → Q98.4
  • Abnormal, abnormality, abnormalitieschromosome, chromosomalsexstructural male → Q98.6
  • Abnormal, abnormality, abnormalitieschromosome, chromosomalsexmale phenotype → Q98.9
  • Anomaly, anomalous (congenital) (unspecified type)chromosomes, chromosomalsexmale phenotype → Q98.9
  • Abnormal, abnormality, abnormalitieschromosome, chromosomalsexmale phenotypespecified NEC → Q98.8
  • Syndromedue to abnormalitychromosomalsexmale phenotype → Q98.9

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy