Coding for birth defects

Diagnostic codes

The British Paediatric Association extension of the International Classification of Diseases Version 9 is used (BPA-ICD9). The WARDA includes up to 10 diagnoses per case and records the following for each anomaly:

BPA-ICD9 code

The WARDA staff have modified and expanded on some of these codes to suit the purposes of the WARDA. These codes are all listed in the "numerical order" document.

Description code

Each anomaly is described in a text field. The default text is listed in the "alphabetical order" document. However, the default text may be modified or expanded for an individual case to provide further description. For example, 75980 SYNDROME OF FACE N.E.C (NEC = not elsewhere classified) would have the actual syndrome diagnoses recorded (e.g. Stickler syndrome). Also, for some anomalies, whether the anomaly affects the left or right or is bilateral is added to the text for anomalies that otherwise have the same diagnostic code.

Major code

Each anomaly is coded as being major (Y) or minor (N), based on an original coding schema used by the Centers for Disease Control in the USA, reflecting the severity of the anomaly. The default code is listed in both alphabetical and numerical coding documents. However, the default code may be changed if the individual anomaly in a particular case does not reflect the default.