Convert to ICD-10-CM: 
363.21 converts approximately to:
- 2015/16 ICD-10-CM H30.23 Posterior cyclitis, bilateral
 ICD-9-CM Volume 2 Index entries containing back-references to 
363.21:
- Cyclitis (see also Iridocyclitis) 364.3  posterior 363.21 posterior 363.21
 
- Pars planitis 363.21