code1 => {
    source1 => {
        primary => 'diagnosis',
        other   => 'information',
    },
    source2 ...
},
code2 ...

##</code><code>##

#!/usr/bin/env perl -l

use strict;
use warnings;

my %data_for = (
    6280 => {
        array => {
            primary => 'Meningitis',
            other => 'Other relevant info ...',
        },
        Encephalitis_77 => {
            primary => 'Encephalitis',
            other => 'Other relevant info ...',
        },
    },
);

search_for_diagnosis_code($_) for (6280, 9999);

sub search_for_diagnosis_code {
    my ($search) = @_;

    print "Searching for '$search' ...";

    if (exists $data_for{$search}) {
        for my $source (keys %{$data_for{$search}}) {
            print "\tFound in '$source':";
            print "\t\tPrimary Diagnosis: $data_for{$search}{$source}{primary}";
            print "\t\tOther Information: $data_for{$search}{$source}{other}";
        }
    }
    else {
        print "\tNo data found.";
    } 
}

##</code><code>##

Searching for '6280' ...
    Found in 'array':
        Primary Diagnosis: Meningitis
        Other Information: Other relevant info ...
    Found in 'Encephalitis_77':
        Primary Diagnosis: Encephalitis
        Other Information: Other relevant info ...
Searching for '9999' ...
    No data found.