2026 ICD-10-CM Diagnosis Code H44.412Flat anterior chamber hypotony of left eye

ICD-10-CM Codes›H00–H59›H43-H44›H44

ICD-10-CM H44.412
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H44.412 is a billable ICD-10-CM diagnosis code for flat anterior chamber hypotony of left eye. 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. Coders also document this condition as flat anterior chamber of eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified eye disorders.

Code Identity

ICD-10-CM Code
H44.412
Billable Status
Yes — Valid for Submission
Code Describes
Flat anterior chamber hypotony of left eye
Short Description
Flat anterior chamber hypotony of left eye
Same as the full description in the CMS dataset.
Parent Code
H44.41
Flat anterior chamber hypotony of eye

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH43-H44Disorders of vitreous body and globe
CategoryH44Disorders of globe
This CodeH44.412Flat anterior chamber hypotony of left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Flat anterior chamber of eye
  • Flat anterior chamber of eye with hypotony
  • Flat anterior chamber of left eye with hypotony
  • Hypotony of eye

Clinical ClassificationClinical

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

CCSR EYE012
Other specified eye disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Eye Diseases

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Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H44.412 to ICD-9-CMHistory

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

ICD-9-CM
360.34 Flat anterior chamber
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 H44.412Overview

Is H44.412 (Flat anterior chamber hypotony of eye) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report flat anterior chamber hypotony of left eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H44.412 group to?

When flat anterior chamber hypotony of left eye 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.

What is the ICD-9 equivalent of H44.412?

Under the General Equivalence Mappings, flat anterior chamber hypotony of left eye converts to ICD-9-CM 360.34 (flat anterior chamber). 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.