Thank you for sending this documentation. This variable is a bit different than the variable, IRCARE, currently available in IPUMS Health Surveys. Most notibly, the universe for IRCARE is for all persons age 4+ who had at least one injury (between 1997-1999) or injury/poisoning (between 2000-2003). This variable that you point to is from a set of questions asked to individuals who are age 60+ or who have limitations that affect their ability to do normal activities.
That being said, I’m not 100% certain why these “limitations” questions are not included in the IPUMS Health Care variables. I’ve passed along your interest to the team and they will look into including these variables in the future. As of right now, however, this variable is not available in IPUMS Health Surveys.