How often do standards change?

Based on our change analysis and update frequency, the changes frequency we have seen is below:

Dataset Source Change Frequency
ISO 3166 Country Codes ISO Every 1-2 months
ISO 4217 Currency Codes; Country-Currency ISO Every 1-2 months
NDC Numbers FDA/CDER Monthly
LOINC Regenstrief Half-yearly
HCPCS CMS 1-2 months
Large Cities World Gazetteer 1-2 months
ISO 639 Languages ISO 1-2 months

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