About Section Q90-Q99

Section Q90-Q99 covers Chromosomal abnormalities, not elsewhere classified within Chapter 17 of the ICD-10-CM Tabular List. This section includes diagnosis codes ranging from Q90 to Q99. Each code below includes its description, billable status, and links to detailed coding guidelines.
Diagnosis Codes 88 entries
Q90Down syndromeNon-Billable›Q90.0Trisomy 21, nonmosaicism (meiotic nondisjunction)Billable›Q90.1Trisomy 21, mosaicism (mitotic nondisjunction)Billable›Q90.2Trisomy 21, translocationBillable›Q90.9Down syndrome, unspecifiedBillable›Q91Trisomy 18 and Trisomy 13Non-Billable›Q91.0Trisomy 18, nonmosaicism (meiotic nondisjunction)Billable›Q91.1Trisomy 18, mosaicism (mitotic nondisjunction)Billable›Q91.2Trisomy 18, translocationBillable›Q91.3Trisomy 18, unspecifiedBillable›Q91.4Trisomy 13, nonmosaicism (meiotic nondisjunction)Billable›Q91.5Trisomy 13, mosaicism (mitotic nondisjunction)Billable›Q91.6Trisomy 13, translocationBillable›Q91.7Trisomy 13, unspecifiedBillable›Q92Other trisomies and partial trisomies of the autosomes, not elsewhere classifiedNon-Billable›Q92.0Whole chromosome trisomy, nonmosaicism (meiotic nondisjunction)Billable›Q92.1Whole chromosome trisomy, mosaicism (mitotic nondisjunction)Billable›Q92.2Partial trisomyBillable›Q92.5Duplications with other complex rearrangementsBillable›Q92.6Marker chromosomesNon-Billable›Q92.61Marker chromosomes in normal individualBillable›Q92.62Marker chromosomes in abnormal individualBillable›Q92.7Triploidy and polyploidyBillable›Q92.8Other specified trisomies and partial trisomies of autosomesBillable›Q92.9Trisomy and partial trisomy of autosomes, unspecifiedBillable›Q93Monosomies and deletions from the autosomes, not elsewhere classifiedNon-Billable›Q93.0Whole chromosome monosomy, nonmosaicism (meiotic nondisjunction)Billable›Q93.1Whole chromosome monosomy, mosaicism (mitotic nondisjunction)Billable›Q93.2Chromosome replaced with ring, dicentric or isochromosomeBillable›Q93.3Deletion of short arm of chromosome 4Billable›Q93.4Deletion of short arm of chromosome 5Billable›Q93.5Other deletions of part of a chromosomeNon-Billable›Q93.51Angelman syndromeBillable›Q93.52Phelan-McDermid syndromeBillable›Q93.59Other deletions of part of a chromosomeBillable›Q93.7Deletions with other complex rearrangementsBillable›Q93.8Other deletions from the autosomesNon-Billable›Q93.81Velo-cardio-facial syndromeBillable›Q93.82Williams syndromeBillable›Q93.88Other microdeletionsBillable›Q93.89Other deletions from the autosomesBillable›Q93.9Deletion from autosomes, unspecifiedBillable›Q95Balanced rearrangements and structural markers, not elsewhere classifiedNon-Billable›Q95.0Balanced translocation and insertion in normal individualBillable›Q95.1Chromosome inversion in normal individualBillable›Q95.2Balanced autosomal rearrangement in abnormal individualBillable›Q95.3Balanced sex/autosomal rearrangement in abnormal individualBillable›Q95.5Individual with autosomal fragile siteBillable›Q95.8Other balanced rearrangements and structural markersBillable›Q95.9Balanced rearrangement and structural marker, unspecifiedBillable›Q96Turner's syndromeNon-Billable›Q96.0Karyotype 45, XBillable›Q96.1Karyotype 46, X iso (Xq)Billable›Q96.2Karyotype 46, X with abnormal sex chromosome, except iso (Xq)Billable›Q96.3Mosaicism, 45, X/46, XX or XYBillable›Q96.4Mosaicism, 45, X/other cell line(s) with abnormal sex chromosomeBillable›Q96.8Other variants of Turner's syndromeBillable›Q96.9Turner's syndrome, unspecifiedBillable›Q97Other sex chromosome abnormalities, female phenotype, not elsewhere classifiedNon-Billable›Q97.0Karyotype 47, XXXBillable›Q97.1Female with more than three X chromosomesBillable›Q97.2Mosaicism, lines with various numbers of X chromosomesBillable›Q97.3Female with 46, XY karyotypeBillable›Q97.8Other specified sex chromosome abnormalities, female phenotypeBillable›Q97.9Sex chromosome abnormality, female phenotype, unspecifiedBillable›Q98Other sex chromosome abnormalities, male phenotype, not elsewhere classifiedNon-Billable›Q98.0Klinefelter syndrome karyotype 47, XXYBillable›Q98.1Klinefelter syndrome, male with more than two X chromosomesBillable›Q98.3Other male with 46, XX karyotypeBillable›Q98.4Klinefelter syndrome, unspecifiedBillable›Q98.5Karyotype 47, XYYBillable›Q98.6Male with structurally abnormal sex chromosomeBillable›Q98.7Male with sex chromosome mosaicismBillable›Q98.8Other specified sex chromosome abnormalities, male phenotypeBillable›Q98.9Sex chromosome abnormality, male phenotype, unspecifiedBillable›Q99Other chromosome abnormalities, not elsewhere classifiedNon-Billable›Q99.0Chimera 46, XX/46, XYBillable›Q99.146, XX true hermaphroditeBillable›Q99.2Fragile X chromosomeBillable›Q99.8Other specified chromosome abnormalitiesNon-Billable›Q99.81Usher syndromeNon-Billable›Q99.811Usher syndrome, type 1Billable›Q99.812Usher syndrome, type 2Billable›Q99.813Usher syndrome, type 3Billable›Q99.818Other Usher syndromeBillable›Q99.819Usher syndrome, unspecifiedBillable›Q99.89Other specified chromosome abnormalitiesBillable›Q99.9Chromosomal abnormality, unspecifiedBillable›