FY2024
Effective from
- Inherited rules changed
Atrial septal defect, unspecified
Billable diagnosis code
CDC/NCHS · FY2024acquired cardiac septal defect (I51.0)
ostium primum atrial septal defect (type I) (Q21.20)
Coverage depends on the payer, service and applicable policy. A billable code does not guarantee payment.
For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.
Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.
Official coding guidelines → · CMS ↗First observed · 2022-10-01
Latest recorded change · FY2024
Effective from
Atrial septal defect, unspecified
Billable diagnosis code
CDC/NCHS · FY2024| All editions | Effective from | Code history |
|---|---|---|
| FY2023 | 2022-10-01 | Added |
| FY2023 · 04-01 | 2023-04-01 | No tabular change |
| FY2024 | 2023-10-01 | Inherited rules changed |
| FY2024 · 04-01 | 2024-04-01 | No tabular change |
| FY2025 | 2024-10-01 | No tabular change |
| FY2025 · 04-01 | 2025-04-01 | No tabular change |
| FY2026 | 2025-10-01 | No tabular change |
| FY2026 · April | 2026-04-01 | No tabular change |
| FY2027 | 2026-10-01 | No tabular change |
The official Tabular List has no additional instructions at this code level.
Review the instructions inherited from its parent categories below. Inherited instructions ↓
Codes from this chapter are not for use on maternal records
acquired cardiac septal defect (I51.0)
ostium primum atrial septal defect (type I) (Q21.20)
Historical assignments from the CDC conversion table support data retrieval. They do not authorize substituting a previous code for the current code.
Previous assignment: Q21.1
Other entries in the same category; these are not automatic substitutes.
| Code | Description | Category · further specificity required |
|---|---|---|
| Q21.11 | Secundum atrial septal defect | Billable / specific |
| Q21.12 | Patent foramen ovale | Billable / specific |
| Q21.13 | Coronary sinus atrial septal defect | Billable / specific |
| Q21.14 | Superior sinus venosus atrial septal defect | Billable / specific |
| Q21.15 | Inferior sinus venosus atrial septal defect | Billable / specific |
| Q21.16 | Sinus venosus atrial septal defect, unspecified | Billable / specific |
| Q21.19 | Other specified atrial septal defect | Billable / specific |
Official titles and instructions are preserved in their source language. Official sources ↗