HES graph LaTeX and TikZ source code

hes_data.tex

\documentclass[8pt]{article}
\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}

\begin{tikzpicture}[scale=.6,every node/.style={minimum size=1cm},on grid]

    \begin{scope}[
       	yshift=9.5,every node/.append style={
       	yslant=0.5,xslant=-1},yslant=0.5,xslant=-1 ]
       	\fill[white,fill opacity=.9] (0,0) rectangle (4,4);
       	\draw[step=10mm, black] (1,1) grid (4,4);
       	\draw[black,very thick] (1,1) rectangle (4,4);
       	\draw[black,very thick, dashed] (0,0) rectangle (5,5);
       \end{scope}

	\begin{scope}[
            yshift=-100,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1  ]
        \fill[white,fill opacity=.1] (0,0) rectangle (5,5);
        \draw[step=4mm, black] (0,0) grid (5,5); 
        \fill[red] (0.05,0.05) rectangle (0.35,0.35);
        \draw[black,very thick] (0,0) rectangle (5,5);%marking borders
    \end{scope}	

    \begin{scope}[
        yshift=-170,every node/.append style={
        yslant=0.5,xslant=-1},yslant=0.5,xslant=-1  ]
        \draw[black,very thick] (0,0) rectangle (5,5);

    \end{scope}

    \draw[-latex,thick](5.9,5)node[right]{Augmented care period}
            to[out=180,in=90] (1.1,3);

    \draw[-latex,thick](5.8,-.3)node[right]{Episode}
           to[out=180,in=90] (3.9,-1);

       \draw[-latex,thick,red](5.3,-3.9)node[right]{
       \begin{tabular}{ l }9 births \\ 20 diagnosis \\ 24 operations \\ \end{tabular}   }
               to[out=180,in=90] (0,-3);

    \draw[-latex,thick](5.2,-6.7)node[right]{Spell}
        to[out=180,in=90] (2,-5);	

\end{tikzpicture}

\end{document}