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ICD-10-CM 2027 diagnosis code

Q99.0Chimera 46, XX/46, XY

✓ Billable / specificPOA exempt

Q99.0 is a valid, billable ICD-10-CM code for chimera 46, xx/46, xy. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Chimera 46.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q99.0

Q99.0 is the ICD-10-CM diagnosis code for Chimera 46, XX/46, XY. It belongs to category Q99 (other chromosome abnormalities, not elsewhere classified), block Q90-Q99 (chromosomal abnormalities, not elsewhere classified) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Q99 (other chromosome abnormalities, not elsewhere classified), Q99.0 is specifically for Chimera 46, XX/46, XY. Related codes cover 46, XX true hermaphrodite (Q99.1), fragile X chromosome (Q99.2), other specified chromosome abnormalities (Q99.8) and chromosomal abnormality, unspecified (Q99.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 729 (Other Male Reproductive System Diagnoses with CC/MCC, relative weight 1.0544), DRG 730 (Other Male Reproductive System Diagnoses without CC/MCC, relative weight 0.6597), DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC, relative weight 1.8456), DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC, relative weight 1.2974), DRG 760 (Menstrual and Other Female Reproductive System Disorders with CC/MCC, relative weight 1.0129) and DRG 761 (Menstrual and Other Female Reproductive System Disorders without CC/MCC, relative weight 0.7041), in MDC 12 (Diseases and Disorders of the Male Reproductive System) and MDC 13 (Diseases and Disorders of the Female Reproductive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 758.81 (other conditions due to sex chromosome anomalies).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Chimera 46, XX/46, XY true hermaphrodite

Notes that apply from higher levels

Instructions written at a parent level also apply to Q99.0.

Broader instructions also apply from Q90-Q99 Chromosomal abnormalities, not elsewhere classified and Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to Q99.0.

Codes whose notes reference Q99.0

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 758.81Other conditions due to sex chromosome anomaliesapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Q99.0

Is Q99.0 billable?

Yes. Q99.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q99.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q99.0 as a principal diagnosis.

Is Q99.0 a CC or MCC?

No. Q99.0 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Q99.0 group to?

Q99.0 is used in the MS-DRG v44.0 logic for MS-DRG 729 (Other Male Reproductive System Diagnoses with CC/MCC), MS-DRG 730 (Other Male Reproductive System Diagnoses without CC/MCC), MS-DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC), MS-DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC), MS-DRG 760 (Menstrual and Other Female Reproductive System Disorders with CC/MCC) and MS-DRG 761 (Menstrual and Other Female Reproductive System Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for Q99.0?

The CMS General Equivalence Mappings map Q99.0 to ICD-9-CM 758.81.