Hi Bobby,
It should be:
SELECT EDG.DX_ID,EDG.DX_NAME,EDG.CURRENT_ICD9_LIST, EDG_PAR.DX_NAME AS PARENT_NAME,EDG_PAR.PAT_FRIENDLY_TEXT
FROM CLARITY_EDG EDG INNER JOIN CLARITY_EDG EDG_PAR
ON EDG.PARENT_DX_ID=EDG_PAR.DX_ID
INNER JOIN EDG_CURRENT_ICD9 ON EDG.DX_ID = EDG_CURRENT_ICD9.DX_ID
INNER JOIN TABLE TableAlias ON alias.field = TableAlias.field
WHERE AAA.BBBB= 0100110
-Abhilash