ICD-10-CM 2027
ICD-10 code for Colli pterygium
From the official ICD-10-CM alphabetic index entry “Pterygium (eye) › colli”. Page updated September 29, 2026.
About coding Colli pterygium
The ICD-10-CM code for Colli pterygium is Q18.3 (Webbing of neck).
Within Q18 (other congenital malformations of face and neck), Q18.3 is specifically for Webbing of neck. Related codes cover sinus, fistula and cyst of branchial cleft (Q18.0), preauricular sinus and cyst (Q18.1), other branchial cleft malformations (Q18.2), Macrostomia (Q18.4), Microstomia (Q18.5), Macrocheilia (Q18.6), Microcheilia (Q18.7), other specified congenital malformations of face and neck (Q18.8) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Colli pterygium ICD-10 codes
What is the ICD-10 code for Colli pterygium?
- Q18.3 — Webbing of neck.
Is Q18.3 billable?
- Yes. Q18.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q18.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q18.3 as a principal diagnosis.
Is Q18.3 a CC or MCC?
- No. Q18.3 is neither a CC nor an MCC under MS-DRG v44.0.