Q18.4

Billable

ChapterQ00–Q99

Ranksubcategory

Official Description

Macrostomia

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Billable/specific code (valid for reimbursement).
•Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99).

General instructions are available for the parent sections:

View CH17 Notes View Q10-Q18 Notes View Q18 Notes

Clinical Hierarchy

CH17Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)

Q10-Q18Congenital malformations of eye, ear, face and neck (Q10-Q18)

Q18Other congenital malformations of face and neck

Q18.4Macrostomia

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to Q18.4:

categoryQ18

Other congenital malformations of face and neck

View context instructions

blockQ10-Q18

Congenital malformations of eye, ear, face and neck (Q10-Q18)

View context instructions

chapterCH17

Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to Q18.4. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

2 raw paths

Macrostomia (congenital)1 unique routes

Direct index entry→Q18.4

Meloschisis1 unique routes

Direct index entry→Q18.4

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 157

Dental and Oral Diseases with MCC

DRG 158

Dental and Oral Diseases with CC

DRG 159

Dental and Oral Diseases without CC/MCC

Cross Reference

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