HL7 v2.3 Vocabulary
0.1.0 - ci-build

HL7 v2.3 Vocabulary, published by HL7/FO. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/frankoemig/hl7.v2.terminology.v23/ and changes regularly. See the Directory of published versions

## CodeSystem: MIME base64 encoding Characters (2.3 - 1.0.0) (Experimental)

Official URL: http://terminology.hl7.org/v2plusvocab/CodeSystem/mimeBase64EncodingCharacters | Version: 1.0.0
Active as of 2026-01-27 | Computable Name: MimeBase64EncodingCharacters
Other Identifiers: OID:2.16.840.1.113883.18.180
Copyright/Legal: HL7 Inc., 2026

HL7-defined code system of concepts specifying the characters used in the MIME Base 64 encoding mechanism. These are for reference only, as they are not carried as explicit code values in any HL7 coded field. This table was published only in releases 2.3, 2.3.1, and 2.4 of the Standard, and was removed thereafter.

This Code system is referenced in the content logical definition of the following value sets:

- Hl7VSmimeBase64EncodingCharacters

Properties

This code system defines the following properties for its concepts

Name | Code | URI | Type | Description
versionIntroduced | versionIntroduced | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionIntroduced | string | version when was this code introduced
versionDeprecated | versionDeprecated | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionDeprecated | string | version when was this code deprecated
status | status | http://hl7.org/fhir/concept-properties#status | code | A code that indicates the status of the concept. Typical values are active, experimental, deprecated, and retired
comment | comment | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#comment | string | A string that provides additional detail pertinent to the use or understanding of the concept
usage | usage | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#usage | string | usage notes for this code
modified | modified | http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#modified | dateTime | date of last modification

Concepts

This case-sensitive code system `http://terminology.hl7.org/v2plusvocab/CodeSystem/mimeBase64EncodingCharacters` defines the following codes:

Code | Display | Definition | versionIntroduced
0 | A | A | 2.3
1 | B | B | 2.3
10 | K | K | 2.3
11 | L | L | 2.3
12 | M | M | 2.3
13 | N | N | 2.3
14 | O | O | 2.3
15 | P | P | 2.3
16 | Q | Q | 2.3
17 | R | R | 2.3
18 | S | S | 2.3
19 | T | T | 2.3
2 | C | C | 2.3
20 | U | U | 2.3
21 | V | V | 2.3
22 | W | W | 2.3
23 | X | X | 2.3
24 | Y | Y | 2.3
25 | Z | Z | 2.3
26 | a | a | 2.3
27 | b | b | 2.3
28 | c | c | 2.3
29 | d | d | 2.3
3 | D | D | 2.3
30 | e | e | 2.3
31 | f | f | 2.3
32 | g | g | 2.3
33 | h | h | 2.3
34 | I | I | 2.3
35 | j | j | 2.3
36 | k | k | 2.3
37 | l | l | 2.3
38 | m | m | 2.3
39 | n | n | 2.3
4 | E | E | 2.3
40 | o | o | 2.3
41 | p | p | 2.3
42 | q | q | 2.3
43 | r | r | 2.3
44 | s | s | 2.3
45 | t | t | 2.3
46 | u | u | 2.3
47 | v | v | 2.3
48 | w | w | 2.3
49 | x | x | 2.3
5 | F | F | 2.3
50 | y | y | 2.3
51 | z | z | 2.3
52 | 0 | 0 | 2.3
53 | 1 | 1 | 2.3
54 | 2 | 2 | 2.3
55 | 3 | 3 | 2.3
56 | 4 | 4 | 2.3
57 | 5 | 5 | 2.3
58 | 6 | 6 | 2.3
59 | 7 | 7 | 2.3
6 | G | G | 2.3
60 | 8 | 8 | 2.3
61 | 9 | 9 | 2.3
62 | + | + | 2.3
63 | / | / | 2.3
7 | H | H | 2.3
8 | I | I | 2.3
9 | J | J | 2.3