The numeric ID (e.g., 1000) for the item condition.
In item results, this is only returned when the seller listed the item with a condition ID. Some categories don't support or require condition IDs (e.g., most Antiques categories don't).
If you Condition as a itemFilter, the response returns items with the correctly matching condition(s), even if conditionId is not returned.
Note: As of September 1, 2021, condition ID 2500 ('Seller Refurbished') is no longer a valid item condition in the Cell Phones & Smartphones category (category ID 9355) for the following marketplaces: US, Canada, UK, Germany, and Australia. This refurbished item condition has been replaced by three new refurbished values, which include 'Excellent - Refurbished' (condition ID 2010), 'Very Good - Refurbished' (condition ID 2020), and 'Good - Refurbished' (condition ID 2030).
Note: In all eBay marketplaces, Condition ID 2000 now maps to an item condition of 'Certified - Refurbished', and not 'Manufacturer Refurbished'. To list an item as 'Certified Refurbished', a seller must be pre-qualified by eBay for this feature.
See the Field Index
to learn which calls use conditionId.