Q13.1
Absence of iris
Q13.1 (also written Q131) is a billable ICD-10-CM diagnosis code for absence of iris. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 9 codes in category Q13 (Congenital malformations of anterior segment of eye). The Alphabetic Index lists it under 6 entries. Its coding notes include a Use additional code instruction and 8 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Use additional code
Add the listed code as a secondary code, if known.
- code for associated glaucoma (H42)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
- cleft lip and cleft palate (Q35-Q37)
- congenital malformation of cervical spine (Q05.0, Q05.5, Q67.5, Q76.0-Q76.4)
- congenital malformation of larynx (Q31.-)
- congenital malformation of lip NEC (Q38.0)
- congenital malformation of nose (Q30.-)
- congenital malformation of parathyroid gland (Q89.2)
- congenital malformation of thyroid gland (Q89.2)
- inborn errors of metabolism (E70-E88)
Inclusion terms
Conditions classified to this code.
- Aniridia
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 6 entries