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ICD-10-CM 2027 diagnosis code

Q23.82Congenital mitral valve cleft leaflet

✓ Billable / specificPOA exempt

Q23.82 is a valid, billable ICD-10-CM code for congenital mitral valve cleft leaflet. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2025 (effective October 1, 2024). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q23.82

Q23.82 is the ICD-10-CM diagnosis code for congenital mitral valve cleft leaflet. It belongs to category Q23 (congenital malformations of aortic and mitral valves), block Q20-Q28 (congenital malformations of the circulatory system) 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 Q23.8 (other congenital malformations of aortic and mitral valves), Q23.82 is specifically for congenital mitral valve cleft leaflet. Related codes cover Bicuspid aortic valve (Q23.81) and other congenital malformations of aortic and mitral valves (Q23.88).

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 306 (Cardiac Congenital and Valvular Disorders with MCC, relative weight 1.546) and DRG 307 (Cardiac Congenital and Valvular Disorders without MCC, relative weight 0.9148), in MDC 05 (Diseases and Disorders of the Circulatory 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 was added in FY2025, effective October 1, 2024.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Cleft mitral valve leaflet at birth

Notes that apply from higher levels

Instructions written at a parent level also apply to Q23.82.

Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to Q23.82.

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.

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
  • FY2025 (effective 10/1/2024): Added
  • No changes since FY2025.

Common questions about Q23.82

Is Q23.82 billable?

Yes. Q23.82 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q23.82 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q23.82 as a principal diagnosis.

Is Q23.82 a CC or MCC?

No. Q23.82 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Q23.82 group to?

Q23.82 is used in the MS-DRG v44.0 logic for MS-DRG 306 (Cardiac Congenital and Valvular Disorders with MCC) and MS-DRG 307 (Cardiac Congenital and Valvular Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.