735.2 is a legacy non-billable code used to specify a medical diagnosis of hallux rigidus. This code was replaced on September 30, 2015 by its ICD-10 equivalent.
References found for the code 735.2 in the Index of Diseases and Injuries:
Fourteen of the 26 bones in your feet are in your toes. The toes, particularly your big toe, help you move and keep your balance. Playing sports, running, and receiving a blow to the foot can damage your toes. Wearing shoes that are too loose or too tight can also cause toe problems.
General Equivalence Map Definitions The ICD-9 and ICD-10 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
As of October 2015, ICD-9 codes are no longer used for medical coding. Instead, use this equivalent ICD-10-CM code, which is an approximate match to ICD-9 code 735.2:
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
Hallux rigidus or stiff big toe is degenerative arthritis and stiffness due to bone spurs that affects the MTP joint at the base of the hallux (big toe).
DRG Group #564-566 - Other musculoskeletal system and connective tissue diagnoses with MCC.
This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code M20.22 and a single ICD9 code, 735.2 is an approximate match for comparison and conversion purposes.