Source: Schema.org v30.1 vocabulary. Official healthPlanId property definition.
What does healthPlanId mean?
The 14-character, HIOS-generated Plan ID number. (Plan IDs must be unique, even across different markets.)
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status