creating a sub-query - sql

Question

Sub-Query Help
I'm having a problem creating a sub-query (I think) and was hoping to get some guidance. Some things have been generalized for simplicity.
Select
A
b
c
d
e
Member ID
Hospital Admit Date
DRG Code
CLM_LN_SVC_FROM_DT
From
Claims Table
Where
DRG Code = 5
And A
And B
And c
I would like to take the result of this query specifically the Member ID and distinct Hospital Admit Dates for the Member and query against the claims table for all claims:
where Member ID in (result from above query) and at this point I need to pull claims in the range 30 days before the admit dates and up to 180 days after the admit date. This is where I'm struggling how to setup this sub query. Any brilliance beyond my limited base would be greatly appreciated...

Answer 1

It sounds you need something similar to following query:
Select Distinct
ClaPeriod.MemberId,
ClaPeriod.DRGCode,
ClaPeriod.ClaimDate,
ClaPeriod.AdmittedDate,
A,
B,
C,
D,
E
From Claims ClaMain,
Claims ClaPeriod
Where (ClaMain.MemberId, ClaMain.AdmittedDate) In (
Select MemberId, AdmittedDate
From Claims claId
Where DRGCode = 5
)
And ClaMain.MemberId = ClaPeriod.MemberId
And ClaPeriod.AdmittedDate >= ClaMain.AdmittedDate - 30
And ClaPeriod.DischargedDate <= ClaMain.AdmittedDate + 180
Order By ClaPeriod.MemberId, ClaPeriod.AdmittedDate
To be honest, I still am not sure I have fully understood your schema. I had to include a Distinct clause in my sql test to avoid duplicate results. If I missed the mark please tell me so and I will try to improve the answer.
UPDATE: Now that the schema is clearer for me as per OP's comments I will try to improve the answer.
As I understand it now, you need to get all claims that:
have the same MBR_ID as a claim with DRG=5.
have an HOSP_ADMT_DT (Admit Date) 30 days prior or before than the CLM_LN_SVC_FROM_DT (From_Date) of the DRG=5 claim.
have an HOSP_DSCHRG_DT (Discharge Date) at least 180 days after the CLM_LN_SVC_FROM_DT (From_Date) of the DRG=5 claim.
If it is so, it can be done with a query that joins the CLM_MED_DETL to itself. ne table would be to filter the claims with DRG=5 and the other to retrieve the claims that have the same MBR_ID and that comply with the date conditions. It would be a query like following:
Select CLAIMS.CLM_MED_DETL_ID,
CLAIMS.CLM_LN_CURR_STAT_TXT,
CLAIMS.CLM_ID_TXT,
CLAIMS.SVCG_PROV_NAME,
CLAIMS.SBMTD_DRG_CD,
CLAIMS.RVNU_CD,
CLAIMS.PLC_OF_SVC_CD,
CLAIMS.CLM_SRC_CD,
CLAIMS.CLM_LN_SEQ_NUM,
CLAIMS.CLM_LN_PRCDR_CD,
CLAIMS.MBR_ID,
CLAIMS.MBR_LST_NAME,
CLAIMS.MBR_FST_NAME,
CLAIMS.SVCG_PROV_ADDR_ZIP_CD,
CLAIMS.SVCG_PROV_ADDR_CNTY,
CLAIMS.HOSP_ADMT_DT,
CLAIMS.HOSP_DSCHRG_DT,
CLAIMS.CLM_LN_UNITS_NUM,
CLAIMS.CLM_LN_CHRG_AMT,
CLAIMS.CLM_LN_ALWD_AMT,
CLAIMS.CLM_LN_PD_AMT,
CLAIMS.TIN_TXT,
CLAIMS.CLM_LN_SVC_FROM_DT,
CLAIMS.CLM_LN_SVC_TO_DT
From CLM_MED_DETL DRG5CLAIMS,
CLM_MED_DETL CLAIMS
Where CLAIMS.MBR_ID = DRG5CLAIMS.MBR_ID
And DRG5CLAIMS.SBMTD_DRG_CD = '005'
And DRG5CLAIMS.CLM_LN_SVC_FROM_DT >= CLAIMS.HOSP_ADMT_DT - 30
And DRG5CLAIMS.CLM_LN_SVC_FROM_DT <= CLAIMS.HOSP_DSCHRG_DT + 180
And CLAIMS.CLM_SRC_CD = 'TRG_FA'
And CLAIMS.CLM_LN_PD_AMT <> 0
And CLAIMS.CLM_LN_CURR_STAT_TXT <> 91
Order By CLAIMS.MBR_LST_NAME Asc, CLAIMS.CLM_LN_SEQ_NUM Asc;