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Possibly equivalent to 

• The inactivated concept is inherently ambiguous.

• Every effort should be made to identify all of the clinically useful "POSSIBLY_EQUIVALENT_TO" target concepts, which should be semantically as close as possible to the meaning of the inactivated concept. Where appropriate, new concepts should be created if they are clinically valid. 
• POSSIBLY_EQUIVALENT_TO target may be singular where the second target is a concept that is of little or no clinical usefulness.

•   It is not necessary to represent all of the semantic meaning of the inactivated concept if the concepts needed should not exist in SNOMED CT.
• If the FSN is vague, not ambiguous, consider using Meaning of component unknown.

Replaced by 

0..1

• Applies to concepts with classification type descriptions

• - do not have to appear in a classification.

• Use with "not otherwise specified", "NOS", "not elsewhere classified", "NEC", "unspecified", "other"

• .

• Partially equivalent to: 

• use where there is a conjunction, ("with", "and", "and/or") and replacement must include all of the clinically valid elements of the conjunction, e.g. has two or more concepts as target values.

•  
• Every effort should be made to identify all of the clinically valid PARTIALLY_EQUIVALENT_TO target concepts, which should be semantically as close as possible to the meaning of the inactivated concept. Where appropriate, new concepts should be created if they are clinically valid.

• The concept has been made inactive because it has the same meaning as another concept.

Replaced by 

• Applies to FSNs which contain an error, that when corrected, potentially changes the semantic meaning of the concept.
• Where the error is grammatical or a spelling mistake, which when corrected does not change the meaning, the description rather than the concept should be inactivated.

• Meaning of the concept cannot be determined.
• The FSN is vague, not ambiguous.

No suitable replacement identified

0..0

• A suitable replacement cannot be identified or concept is no longer in scope, e.g. administrative, occupation or country concepts are under discussion. 
• When jurisdictional control of a concept passes between extensions, eg. international core and the veterinary extension, or relates to specific forms, legal entities, etc.; no replacement is required.
• Applies to a concept which does not adhere to editorial guidelines eg. grouper that cannot be defined. 
• Applies to concept that does not adhere to Precoordination Naming Patterns
• Replaced by: Where conformance to editorial policy potentially changes the meaning of a concept and it is possible to replace this with a concept that is semantically very close to the inactivated concept.
• Alternative: Editorial policy results in a change in scope e.g. branded products were considered out of scope for SNOMED CT, an Alternative would be the generic product.

Replaced by 

No suitable replacement identified

0..0

• The inactivated concept is an outdated concept that is no longer considered to be clinically acceptable or semantically interoperable internationally.
• In some circumstances, an outdated concept simply falls into disuse without any appropriate replacement.
• Possibly replaced by is used when two or more potential replacements exist; two or more concepts as targets can be selected. 
• Replaced by is used when a concept exists that is semantically similar to, or more general than, the inactivated concept for the purposes of reconciling historical data analysis.