| TTY (Term Type in Source) |
| AA | Attribute type abbreviation |
| AB | Abbreviation in any source vocabulary |
| ACR | Acronym |
| AC | Activities |
| AD | Adjective |
| AS | Attribute type synonym |
| AT | Attribute type |
| BD | Fully-specified drug brand name that can be prescribed |
| BN | Fully-specified drug brand name that can not be prescribed |
| BSY | Broad synonym |
| BioCPT | BioCarta PT |
| CCN | Chemical code name |
| CCS | FIPS 10-4 country code |
| CC | Trimmed ICPC component process |
| CDA | Clinical drug name in abbreviated format |
| CDCPT | Centers for Disease Control and Prevention PT |
| CDC | Clinical drug name in concatenated format (NDDF), Clinical drug name (NDFRT) |
| CDD | Clinical drug name in delimited format |
| CDISCPT | Clinical Data Interchange Standards Consortium PT |
| CDISCSY | Clinical Data Interchange Standards Consortium SY |
| CD | Clinical Drug |
| CE | Entry "term" to a Supplementary Concept "term" |
| CHN | Chemical structure name |
| CL | Class |
| CMN | Common name |
| CN | LOINC official component name |
| CO | Component name (these are hierarchical terms, as opposed to the LOINC component names which are analytes) |
| CP | ICPC component process (in original form) |
| CSN | Chemical Structure Name |
| CS | Short component process in ICPC, i.e. include some abbreviations |
| CU | Common usage |
| CV | Content view |
| CX | Component process in ICPC with abbreviations expanded |
| DCPPT | Division of Cancer Prevention Program PT |
| DEV | Descriptor entry version |
| DE | Descriptor |
| DF | Dose Form |
| DI | Disease name |
| DN | Display Name |
| DO | Domain |
| DP | Drug Product |
| DSV | Descriptor sort version |
| DS | Short form of descriptor |
| DTPSY | Developmental Therapeutics Program SY |
| DX | Diagnosis |
| EN | MeSH nonprint entry "term" |
| EP | Entry "term" |
| EQ | Equivalent name |
| ES | Short form of entry term |
| ETAV | Entry Term Allelic Variant |
| ET | Entry "term" |
| EX | Expanded form of entry term |
| FBD | Foreign brand name |
| FDAAB | Food and Drug Administration AB |
| FDAPT | Food and Drug Administration PT |
| FDASY | Food and Drug Administration SY |
| FI | Finding name |
| FN | Full form of descriptor |
| GN | Generic drug name |
| GO | Goal |
| GT | Glossary "term" |
| HC | Hierarchical class |
| HD | Hierarchical descriptor |
| HGJKN1 | Japanese High Level Group Term (kana1) |
| HGJKN | Japanese High Level Group Term (kana) |
| HG | High Level Group Term |
| HS | Short or alternate version of hierarchical term |
| HTJKN1 | Japanese Hierarchical term (kana1) |
| HTJKN | Japanese Hierarchical term (kana) |
| HTN | HL7 Table Name |
| HT | Hierarchical term |
| HX | Expanded version of short hierarchical term |
| ID | Nursing indicator |
| INP | Ingredient preparation |
| IN | Name for an ingredient |
| IS | Obsolete Synonym |
| IT | Index "term", i.e., derived from the index to any non-MeSH source vocabulary |
| IV | Intervention |
| JAXPT | NCI Mouse Terminology PT |
| JAXSY | NCI Mouse Terminology SY |
| KEGGPT | Kyoto Encyclopedia of Genes and Genomes PT |
| LN | LOINC official fully specified name |
| LO | Obsolete official fully specified name |
| LPDN | LOINC parts display name |
| LPN | LOINC parts name |
| LS | Expanded system/sample type (The expanded version was created for the Metathesaurus and includes the full name of some abbreviations.) |
| LTJKN1 | Japanese Lower Level Term (kana1) |
| LTJKN | Japanese Lower Level Term (kana) |
| LT | Lower Level Term |
| LV | Lexical variant |
| LX | Official fully specified name with expanded abbreviations |
| MD | CCS multi-level diagnosis categories |
| MH | Main heading |
| MOA | Mechanism of action |
| MP | Preferred names of modifiers |
| MS | Multum names of branded and generic supplies or supplements |
| MTH_AB | MTH abbreviation |
| MTH_ACR | MTH acronym |
| MTH_BD | MTH fully-specified drug brand name that can be prescribed |
| MTH_BSY | Metathesaurus broad synonym expanded |
| MTH_CHN | MTH chemical structure name |
| MTH_EP | MTH entry "term" |
| MTH_FN | MTH Full form of descriptor |
| MTH_HG | MTH High Level Group Term |
| MTH_HT | MTH Hierarchical term |
| MTH_ID | Metathesaurus expanded form of nursing indicator |
| MTH_IS | Metathesaurus-supplied form of obsolete synonym |
| MTH_LT | MTH Lower Level Term |
| MTH_LV | MTH lexical variant |
| MTH_MH | MTH main heading |
| MTH_NPT | MTH non-preferred for language term |
| MTH_NSY | Metathesaurus narrow synonym expanded |
| MTH_OF | Metathesaurus-supplied form of obsolete fully specified name |
| MTH_OL | MTH Non-current Lower Level Term |
| MTH_OPN | Metathesaurus obsolete preferred term, natural language form |
| MTH_OP | Metathesaurus obsolete preferred term |
| MTH_OS | MTH System-organ class |
| MTH_PTGB | Metathesaurus-supplied form of British preferred term |
| MTH_PTN | Metathesaurus preferred term, natural language form |
| MTH_PT | Metathesaurus preferred term |
| MTH_RLS | Metathesaurus related synonym expanded |
| MTH_SMQ | Metathesaurus version of Standardised MedDRA Query |
| MTH_SYGB | Metathesaurus-supplied form of British synonym |
| MTH_SY | MTH Designated synonym |
| MT | An alternate form of a concept name from one of the source vocabularies created for the Metathesaurus |
| MV | Multi-level procedure category |
| N1 | Chemical Abstracts Service Type 1 name of a chemical |
| NCI-GLOSSPT | NCI-GLOSS PT |
| NCI-GLOSSSY | NCI-GLOSS SY |
| NM | Supplementary chemical "term", a name of a substance |
| NPT | HL7 non-preferred for language term |
| NP | Non-preferred term |
| NSY | Narrow synonym |
| NS | Short form of non-preferred term |
| NX | Expanded form of non-preferred term |
| OA | Obsolete abbreviation |
| OBS | Obsolete broad synonym |
| OB | Obsolete term |
| OCD | Obsolete clinical drug |
| OC | Nursing outcomes |
| OF | Obsolete fully specified name |
| OLJKN1 | Japanese Non-current Lower Level Term (kana1) |
| OLJKN | Japanese Non-current Lower Level Term (kana) |
| OLX | Expanded LOINC obsolete fully specified name |
| OL | Non-current Lower Level Term |
| OM | Obsolete modifiers in HCPCS |
| ONP | Obsolete non-preferred for language term |
| ONS | Obsolete narrow synonym |
| OOSN | Obsolete official short name |
| OPN | Obsolete preferred term, natural language form |
| OP | Obsolete preferred term |
| ORS | Obsolete related synonym |
| OR | Orders |
| OSJKN1 | Japanese System-organ class in the WHO Adverse Reaction Terminology (kana1) |
| OSJKN | Japanese System-organ class in the WHO Adverse Reaction Terminology (kana) |
| OSN | Official short name |
| OS | System-organ class in the WHO Adverse Reaction Terminology |
| PCE | Preferred entry "term" to a Supplementary Concept "term" |
| PC | Preferred "trimmed term" in ICPC |
| PEN | Preferred MeSH nonprint entry "term" |
| PEP | Preferred entry "term" |
| PE | Physiologic effect |
| PK | Pharmacokinetics |
| PM | Machine permutation |
| PN | Metathesaurus preferred name |
| PQ | Qualifier for a problem |
| PR | Name of a problem |
| PSC | Protocol selection criteria |
| PS | Short forms that needed full specification |
| PTAV | Preferred Allelic Variant |
| PTCS | Preferred Clinical Synopsis |
| PTGB | British preferred term |
| PTJKN1 | Japanese Designated preferred name (kana1) |
| PTJKN | Japanese Designated preferred name (kana) |
| PTN | Preferred term, natural language form |
| PT | Designated preferred name |
| PXQ | Preferred term in preferred qualifier concept. |
| PX | Expanded preferred terms (pair with PS) |
| QAB | Qualifier abbreviation |
| QEV | Qualifier entry version |
| QSV | Qualifier sort version |
| RAB | Root abbreviation |
| RHT | Root hierarchical term |
| RLS | Related synonym |
| RPT | Root preferred term |
| RSY | Root synonym |
| RS | Extracted related names in SNOMED2 |
| RT | Designated related "term" |
| SBDC | Semantic Branded Drug Component |
| SBDF | Semantic branded drug and form |
| SBD | Semantic branded drug |
| SB | Named subset of a source |
| SCDC | Semantic Drug Component |
| SCDF | Semantic clinical drug and form |
| SCD | Semantic Clinical Drug |
| SCN | Scientific name |
| SC | Special Category term |
| SD | CCS single-level diagnosis categories |
| SI | Name of a sign or symptom of a problem |
| SMQ | Standardised MedDRA Query |
| SN | Official component synonym in LOINC |
| SP | CCS single-level procedure categories |
| SSN | Source short name, used in the UMLS Knowledge Source Server |
| SS | Synonymous "short" forms |
| ST | Step |
| SU | Active Substance |
| SX | Mixed-case component synonym with expanded abbreviations |
| SYGB | British synonym |
| SYN | Designated alias |
| SY | Designated synonym |
| TA | Task |
| TC | Term class |
| TG | Name of the target of an intervention |
| TQ | Topical qualifier |
| TX | CCPSS synthesized problems for TC termgroup |
| UCN | Unique common name |
| UE | Unique equivalent name |
| USN | Unique scientific name |
| USY | Unique synonym |
| VAB | Versioned abbreviation |
| VPT | Versioned preferred term |
| VSY | Versioned synonym |
| XD | Expanded descriptor in AOD |
| XM | Cross mapping set |
| XQ | Alternate name for a qualifier |
| XX | Expanded string |