How to maintain patient medical records to generate reports

Hi mallela_hari_krishna 

In response to your email "Can you please do a list of applied steps power query... Kindly narrate to me how you have extracted the data"

I'm afraid it's not realistic to explain everything in details. To help you I looked at doing it with the Power Query User Interface only giving each step a meaningful name. Then edited the query code with the Advanced Editor to add some break lines (for readability only) and comments (begin with //) above almost each step:

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    SelectedRequiredColumnsOnly = Table.SelectColumns(Source,{"NAME", "DIAGNOSIS", "CURRENT MEDICATION"}),

    // Inconsistent delimiters exist in DIAGNOSIS & CURRENT MEDICATION
    // Sometimes comma only, sometimes comma+space, sometimes space+comma
    ReplacedCommaSpaceWithComma = Table.ReplaceValue(SelectedRequiredColumnsOnly,", ",",",Replacer.ReplaceText,{"DIAGNOSIS","CURRENT MEDICATION"}),
    ReplacedSpaceCommaWithComma = Table.ReplaceValue(ReplacedCommaSpaceWithComma," ,",",",Replacer.ReplaceText,{"DIAGNOSIS", "CURRENT MEDICATION"}),

    // Some DIAGNOSIS & CURRENT MEDIATIONS have trailing spaces
    RemovedTrailingSpaces = Table.TransformColumns(ReplacedSpaceCommaWithComma,
        {{"DIAGNOSIS", Text.Trim, type text}, {"CURRENT MEDICATION", Text.Trim, type text}}
    ),

    // Don't try to understand this step, part of it isn't documented
    SplitDiagnosisToRows = Table.ExpandListColumn(
        Table.TransformColumns(RemovedTrailingSpaces,
            {{"DIAGNOSIS", Splitter.SplitTextByDelimiter(",", QuoteStyle.Csv), let itemType = (type nullable text) meta [Serialized.Text = true] in type {itemType}}}
        ), "DIAGNOSIS"
    ),

    // Some DIAGNOSIS have a comma at the end of the string
    // ==> After spliting DIAGNOSIS we get extra (blank) rows
    FilteredOutBlankDiagnosis = Table.SelectRows(SplitDiagnosisToRows, each ([DIAGNOSIS] <> "")),

    // Some CURRENT MEDICATION starts with "TAB:", others with "tab:"
    // Power Query is case sensitive. Using Comparer.OrdinalIgnoreCase "TAB:" = "tab:"
    // if CURRENT MEDICATION begins with "tab:"
    // then take the first 4 char. of CURRENT MEDICATION
    // else return a 'null' value
    IsolatedTabPrefix = Table.AddColumn(FilteredOutBlankDiagnosis, "MEDICATION_PREFIX", each
        if Text.StartsWith([CURRENT MEDICATION], "tab:", Comparer.OrdinalIgnoreCase)
        then Text.Start([CURRENT MEDICATION], 4)                        
        else null
    ),

    // Get the actual MEDICATION
    // If MEDICATION_PREFIX = 'null' (there's no "tab:" / "TAB:" prefix) in CURRENT MEDICATION
    // then take CURRENT MEDICATION
    // else take CURRENT MEDICATION after MEDICATION_PREFIX
    ActualMedication = Table.AddColumn(IsolatedTabPrefix, "MEDICATION", each
        if [MEDICATION_PREFIX] = null
        then [CURRENT MEDICATION]
        else Text.AfterDelimiter([CURRENT MEDICATION],[MEDICATION_PREFIX])
    ),
    // Columns no more required ==> Remove them
    RemovedColumns = Table.RemoveColumns(ActualMedication,{"CURRENT MEDICATION", "MEDICATION_PREFIX"}),

    // Some MEDICATION begin with TAB:<space>, others with TAB: without a space after
    TrimmedTrailingSpacesAgain = Table.TransformColumns(RemovedColumns,{{"MEDICATION", Text.Trim, type text}}),

    // Again, don't try to understand this step, part of it isn't documented
    SplitMedicationToRows = Table.ExpandListColumn(
        Table.TransformColumns(TrimmedTrailingSpacesAgain,
            {{"MEDICATION", Splitter.SplitTextByDelimiter(",", QuoteStyle.Csv), let itemType = (type nullable text) meta [Serialized.Text = true] in type {itemType}}}
        ), "MEDICATION"
    ),

    // Some MEDICATION have a comma at the end of the string
    // ==> After spliting MEDICATION we get extra (blank) rows
    FilteredOutBlankMedication = Table.SelectRows(SplitMedicationToRows, each ([MEDICATION] <> ""))
in
    FilteredOutBlankMedication

Same result in Power Pivot Table:

If you want to understand exactly what each Power Query function does, the documentation is available https://docs.microsoft.com/en-us/powerquery-m/

Hope this helps