All ICD10 Codes

Q99

Non-Billable
ChapterQ00–Q99
Rankcategory
Official Description

Other chromosome abnormalities, not elsewhere classified

Use a more specific code (4 billable, 1 non-billable)
Q99.0Chimera 46, XX/46, XYQ99.146, XX true hermaphroditeQ99.2Fragile X chromosomeQ99.8Other specified chromosome abnormalitieshas subcodesQ99.9Chromosomal abnormality, unspecified
Metadata & Insights
  • •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. Code separately if applicable.)
  • inborn errors of metabolism (E70-E88)

Q90-Q99 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • mitochondrial metabolic disorders (E88.4-)

Clinical Hierarchy

BillableHas subcodes
CH17Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Q90-Q99Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
Q99Other chromosome abnormalities, not elsewhere classifiedNot billable
Q99.0Chimera 46, XX/46, XYBillable
Q99.146, XX true hermaphroditeBillable
Q99.2Fragile X chromosomeBillable
Q99.8Other specified chromosome abnormalitiesSubcodes
Q99.9Chromosomal abnormality, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to Q99:

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

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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