Our goal is to enroll at least 1500 patients with achondroplasia from the aforementioned sites. Access to the registry is password-protected and the data will be backed up on the IGM server daily. A co-investigator will be able to enter and access the identifying information (i.e. name, address, contact information, DOB) for their patients only in the registry. Thereafter, a unique study identification number, calculated age of the subject (based on the date of data entry) and diagnosis will be the only identifiers accessible to the other co-investigators. The total deidentified phenotype data will be available to the co-investigators during data analysis.