diff --git a/R/data-load.R b/R/data-load.R
index 80b57ee4..071a8195 100644
--- a/R/data-load.R
+++ b/R/data-load.R
@@ -178,6 +178,18 @@ load_difftime.sic_tbl <- function(x, rows, cols = colnames(x),
   load_eiau(x, {{ rows }}, cols, id_hint, time_vars, sec_as_mins)
 }
 
+#' @rdname load_src
+#' @export
+# copy-pasted from mimic_tbl
+load_difftime.picdb_tbl <- function(x, rows, cols = colnames(x),
+                                   id_hint = id_vars(x),
+                                   time_vars = ricu::time_vars(x), ...) {
+
+  warn_dots(...)
+
+  load_mihi(x, {{ rows }}, cols, id_hint, time_vars)
+}
+
 #' @rdname load_src
 #' @export
 load_difftime.character <- function(x, src, ...) {
diff --git a/R/data-utils.R b/R/data-utils.R
index 0d2b73cc..31fa02df 100644
--- a/R/data-utils.R
+++ b/R/data-utils.R
@@ -361,6 +361,35 @@ id_win_helper.miiv_env <- function(x) {
   order_rename(res, ids, sta, end)
 }
 
+#' @rdname data_utils
+#' @export
+# copy-pasted from mimic
+id_win_helper.picdb_env <- function(x) {
+
+  merge_inter <- function(x, y) {
+    merge(x, y, by = intersect(colnames(x), colnames(y)))
+  }
+
+  get_id_tbl <- function(tbl, id, start, end, aux) {
+    as_src_tbl(x, tbl)[, c(id, start, end, aux)]
+  }
+
+  cfg <- sort(as_id_cfg(x), decreasing = TRUE)
+
+  ids  <- field(cfg, "id")
+  sta <- field(cfg, "start")
+  end  <- field(cfg, "end")
+
+  res <- Map(get_id_tbl, field(cfg, "table"), ids, sta,
+             end, c(as.list(ids[-1L]), list(NULL)))
+  res <- Reduce(merge_inter, res)
+
+  res <- res[, c(sta, end) := lapply(.SD, as_dt_min, get(sta[1L])),
+             .SDcols = c(sta, end)]
+
+  order_rename(res, ids, sta, end)
+}
+
 #' @export
 id_win_helper.default <- function(x) stop_generic(x, .Generic)