Q20.9 — Congenital malformation of cardiac chambers and connections, unspecified
Is Q20.9 billable?
Yes, but Q20.9 is an unspecified code. Q20.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Q20.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting Q20.9 — the more specific alternatives are listed below.
More specific alternatives
- Q20.0Common arterial trunk
- Q20.1Double outlet right ventricle
- Q20.2Double outlet left ventricle
- Q20.3Discordant ventriculoarterial connection
- Q20.4Double inlet ventricle
- Q20.5Discordant atrioventricular connection
- Q20.6Isomerism of atrial appendages
- Q20.8Other congenital malformations of cardiac chambers and connections
Q20.9 at a glance
| Code | Q20.9 |
|---|---|
| Description | Congenital malformation of cardiac chambers and connections, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q20.9 group to?
Q20.9 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 Q20.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q20.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Anomaly, anomalous › cardiac › chambers (congenital) (unspecified type)
- Malformation › cardiac › chambers (congenital)
Excludes1 — never code together — inherited from Q20
The conditions below can never be reported together with Q20.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q20.9, but a patient may have both at the same time. When documentation supports it, Q20.9 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
How long has Q20.9 existed?
Q20.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the Q20 family? (8)
- Q20.0Common arterial trunk
- Q20.1Double outlet right ventricle
- Q20.2Double outlet left ventricle
- Q20.3Discordant ventriculoarterial connection
- Q20.4Double inlet ventricle
- Q20.5Discordant atrioventricular connection
- Q20.6Isomerism of atrial appendages
- Q20.8Other congenital malformations of cardiac chambers and connections