2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. Coders also document this condition as decreased intraocular pressure of left 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.

  • Decreased intraocular pressure of left eye
  • Flat anterior chamber of eye
  • Flat anterior chamber of eye with hypotony
  • Flat anterior chamber of left eye with hypotony
  • Hypotony of eye
  • Intraocular pressure of left eye below reference range

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H44.412: its own notes plus those printed at H44 and Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From H44 Disorders of globe applies to 158 codes
  • disorders affecting multiple structures of eye

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)

Notes

General instructions on how these codes are used.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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

Even if your eyes feel healthy, you could have a problem and not know it. That's why regular eye exams are so important. Refractive errors are the most common type of vision problem that makes it hard to see clearly. But some eye conditions or diseases don't have any symptoms and can lead to a permanent loss of vision.

The full article covers:

  • What diseases can affect the eye?
  • What are the symptoms of eye diseases?
  • Who is more likely to develop eye diseases?
  • What are the treatments for eye diseases?
  • Can eye diseases be prevented?

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H44.412Overview

What is the ICD-10 code for flat anterior chamber hypotony of left eye?

The ICD-10-CM code for flat anterior chamber hypotony of left eye is H44.412 (sometimes written as H44412). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 125, 124, with relative weights from 0.7699 to 1.2470 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.