H21.51
Anterior synechiae (iris)
Non-billable headerNot valid on its own. Use one of the more specific codes under it.
H21.51 is a non-billable ICD-10-CM code header for anterior synechiae (iris). Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are H21.511 Anterior synechiae (iris), right eye; H21.512 Anterior synechiae (iris), left eye; H21.513 Anterior synechiae (iris), bilateral and H21.519 Anterior synechiae (iris), unspecified eye. Its coding notes include 1 Excludes1 entry and 12 Excludes2 entries.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (11 notes)
Inherited from Chapter 7 Diseases of the eye and adnexa
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury (trauma) of eye and orbit (S05.-)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)
Notes
Also from chapter/block level (1 note)
Inherited from Chapter 7 Diseases of the eye and adnexa
- Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry