2026 ICD-10-CM Diagnosis Code H21.553Recession of chamber angle, bilateral

ICD-10-CM Codes›H00–H59›H15-H22›H21

ICD-10-CM H21.553
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H21.553 is a billable ICD-10-CM diagnosis code for recession of chamber angle, bilateral. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Glaucoma and Other specified eye disorders.

Code Identity

ICD-10-CM Code
H21.553
Billable Status
Yes — Valid for Submission
Code Describes
Recession of chamber angle, bilateral
Short Description
Recession of chamber angle, bilateral
Same as the full description in the CMS dataset.
Parent Code
H21.55
Recession of chamber angle

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH21Other disorders of iris and ciliary body
This CodeH21.553Recession of chamber angle, bilateral

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Angle recession
  • Angle recession glaucoma
  • Angle recession glaucoma of left eye
  • Angle recession glaucoma of right eye
  • Bilateral angle recession glaucoma
  • Bilateral ocular hypertension due to angle recession
  • Bilateral open angle glaucoma due to and following ocular trauma of eyes
  • Bilateral recession of chamber angle of eyes
  • Bilateral traumatic glaucoma
  • Glaucoma of left eye due to and following ocular trauma
  • Glaucoma of right eye due to and following ocular trauma
  • Ocular hypertension due to angle recession
  • Ocular hypertension of left eye due to angle recession
  • Ocular hypertension of right eye due to angle recession
  • Open angle glaucoma due to and following ocular trauma
  • Open angle glaucoma of left eye due to and following ocular trauma
  • Open angle glaucoma of right eye due to and following ocular trauma
  • Recession of chamber angle of left eye
  • Recession of chamber angle of right eye

Clinical ClassificationClinical

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

CCSR EYE003
Glaucoma
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR EYE012
Other specified eye disorders
Default principal diagnosis: inpatient No · outpatient No

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 H21.553 to ICD-9-CMHistory

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

ICD-9-CM
364.77 Recession, chamber angle
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 H21.553Overview

Is H21.553 (Recession of chamber angle) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report recession of chamber angle, bilateral on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H21.553 group to?

When recession of chamber angle, bilateral 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 H21.553?

Under the General Equivalence Mappings, recession of chamber angle, bilateral converts to ICD-9-CM 364.77 (recession, chamber angle). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.