Q23.81 — Bicuspid aortic valve
Is Q23.81 billable?
Yes — Q23.81 is billable for FY2027. Q23.81 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Q23.81 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Q23.81 at a glance
| Code | Q23.81 |
|---|---|
| Description | Bicuspid aortic valve |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q23.81 group to?
Q23.81 sits in MDC 05 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 306Cardiac Congenital and Valvular Disorders with MCCmedical
- 307Cardiac Congenital and Valvular Disorders without MCCmedical
How is Q23.81 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q23.81. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Bicuspid aortic valve (at birth) (congenital)
- Unicuspid aortic valve (at birth) (congenital)
- Anomaly, anomalous › heart › valve NEC › aortic › bicuspid valve (congenital) (unspecified type)
Code also
Two codes may be needed to describe the condition fully. Whether Q23.81 is sequenced first depends on the reason for the encounter.
Inclusion terms
Alternative wording in documentation that is classified to Q23.81.
- Congenital bicuspid aortic valve
- Unicuspid (congenital) aortic valve (at birth)
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q23.81, but a patient may have both at the same time. When documentation supports it, Q23.81 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
How long has Q23.81 existed?
Q23.81 first appears in FY2025.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.