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Pure Elixir HL7 v2.x toolkit — schema-driven parsing, typed segments, message builder, MLLP transport
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lib/hl7v2/type/ocd.ex
defmodule HL7v2.Type.OCD do
@moduledoc """
Occurrence Code and Date (OCD) -- HL7v2 composite data type.
Links a UB occurrence code to its date for billing segments (UB2-7).
2 components:
1. Occurrence Code (CNE) -- sub-components, Table 0350
2. Occurrence Date (DT) -- YYYY[MM[DD]]
"""
@behaviour HL7v2.Type
alias HL7v2.Type
alias HL7v2.Type.{CNE, DT}
defstruct [
:occurrence_code,
:occurrence_date
]
@type t :: %__MODULE__{
occurrence_code: CNE.t() | nil,
occurrence_date: Date.t() | DT.t() | nil
}
@doc """
Parses an OCD from a list of components.
## Examples
iex> HL7v2.Type.OCD.parse(["01&Accident&NUBC", "20260115"])
%HL7v2.Type.OCD{
occurrence_code: %HL7v2.Type.CNE{identifier: "01", text: "Accident", name_of_coding_system: "NUBC"},
occurrence_date: ~D[2026-01-15]
}
iex> HL7v2.Type.OCD.parse([])
%HL7v2.Type.OCD{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
occurrence_code: Type.parse_sub(CNE, Type.get_component(components, 0)),
occurrence_date: components |> Type.get_component(1) |> DT.parse()
}
end
@doc """
Encodes an OCD to a list of component strings.
## Examples
iex> HL7v2.Type.OCD.encode(%HL7v2.Type.OCD{occurrence_code: %HL7v2.Type.CNE{identifier: "01"}, occurrence_date: ~D[2026-01-15]})
["01", "20260115"]
iex> HL7v2.Type.OCD.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = ocd) do
[
Type.encode_sub(CNE, ocd.occurrence_code),
DT.encode(ocd.occurrence_date)
]
|> Type.trim_trailing()
end
end