2026 ICD-10-CM Diagnosis Code Q13.9Congenital malformation of anterior segment of eye, unspecified

ICD-10-CM Codes›Q00-Q99›Q10-Q18›Q13

ICD-10-CM Q13.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q13.9 is a billable ICD-10-CM diagnosis code for congenital malformation of anterior segment of eye, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Congenital malformations of eye, ear, face, neck.

Code Identity

ICD-10-CM Code
Q13.9
Billable Status
Yes — Valid for Submission
Code Describes
Congenital malformation of anterior segment of eye, unspecified
Short Description
Congenital malformation of anterior segment of eye, unsp
Parent Code
Q13
Congenital malformations of anterior segment of eye

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ10-Q18Congenital malformations of eye, ear, face and neck
CategoryQ13Congenital malformations of anterior segment of eye
This CodeQ13.9Congenital malformation of anterior segment of eye, unspecified

Present on Admission (POA)Billing

Q13.9 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anterior chamber anomalies
  • Bilateral congenital anomaly of sclera
  • Bilateral ocular hypertension due to anterior segment anomaly
  • Congenital abnormality of iris and ciliary body
  • Congenital anomaly of anterior chamber of eye
  • Congenital anomaly of anterior segment of eye
  • Congenital anomaly of left sclera
  • Congenital anomaly of right sclera
  • Congenital anomaly of sclera
  • Congenital structural abnormality of ciliary body
  • Eye defects, arachnodactyly, cardiopathy syndrome
  • Facial dysmorphism, lens dislocation, anterior segment abnormalities, spontaneous filtering bleb syndrome
  • Glaucoma due to anterior segment anomaly
  • Glaucoma of bilateral eyes due to anterior segment anomaly
  • Glaucoma of left eye due to anterior segment anomaly
  • Glaucoma of right eye due to anterior segment anomaly
  • Multiple anterior segment anomalies
  • Ocular hypertension due to anterior segment anomaly
  • Ocular hypertension of left eye due to anterior segment anomaly
  • Ocular hypertension of right eye due to anterior segment anomaly

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Anomaly, anomalous(congenital) (unspecified type)
      • eye
        • anterior segment

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MAL005
Congenital malformations of eye, ear, face, neck
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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Convert Q13.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
743.44 Anom anter chamber-eye
Approximate The match is approximate rather than exact.
ICD-9-CM
743.49 Anom anter seg NEC-eye
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Q13.9Overview

Is Q13.9 (Congenital malformations of anterior segment of eye) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report congenital malformation of anterior segment of eye, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q13.9 group to?

When congenital malformation of anterior segment of eye, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q13.9 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for congenital malformation of anterior segment of eye, unspecified on inpatient claims.

What is the ICD-9 equivalent of Q13.9?

Under the General Equivalence Mappings, congenital malformation of anterior segment of eye, unspecified converts to ICD-9-CM 743.44 (anom anter chamber-eye) and 743.49 (anom anter seg NEC-eye). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.