2027 ICD-10-CM Diagnosis Code H34.00Transient retinal artery occlusion, unspecified eye

ICD-10-CM Codes›H00–H59›H30-H36›H34

ICD-10-CM H34.00
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H34.00 is a billable ICD-10-CM diagnosis code for transient retinal artery occlusion, unspecified eye. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 123. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 46 closely related codes. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. Coders also document this condition as transient arterial retinal occlusion. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.

Code Identity

ICD-10-CM Code
H34.00
Billable Status
Yes — Valid for Submission
Code Describes
Transient retinal artery occlusion, unspecified eye
Short Description
Transient retinal artery occlusion, unspecified eye
Same as the full description in the CMS dataset.
Parent Code
H34.0
Transient retinal artery occlusion

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH30-H36Disorders of choroid and retina
CategoryH34Retinal vascular occlusions
This CodeH34.00Transient retinal artery occlusion, unspecified eye

Code EditsBilling

Medicare Code Editor checks that affect claim validity for H34.00.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Transient arterial retinal occlusion

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H34.00: its own notes plus those printed at H34 and Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From H34 Retinal vascular occlusions applies to 45 codes

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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name H34.00, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming H34.00: they are not reported together with it, unless the two conditions are unrelated.

  • G45 Transient cerebral ischemic attacks and related syndromes
    transient retinal artery occlusion (H34.0-) names H34.0-, which includes this code
  • H53.12 Transient visual loss
    transient retinal artery occlusion (H34.0-) names H34.0-, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming H34.00: its condition is not part of those codes, and both may be reported when the patient has both.

  • I74 Arterial embolism and thrombosis
    ophthalmic embolism and thrombosis (H34.-) names H34.-, which includes this code
  • I74 Arterial embolism and thrombosis
    retinal embolism and thrombosis (H34.-) names H34.-, which includes this code

Clinical ClassificationClinical

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

CCSR EYE005
Retinal and vitreous conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Transient Retinal Arterial Occlusion

    a partial, temporary occlusion of the retinal artery.

Patient EducationClinical

Retinal Disorders

Retinal disorders are conditions that affect the retina, the thin light-sensitive tissue at the back of your eye. The retina senses light and sends signals to your brain so you can see.

The full article covers:

  • What are retinal disorders?
  • What causes retinal disorders?
  • What are common retinal disorders?
  • What are the symptoms of retinal disorders?
  • How are retinal disorders diagnosed?
  • How are retinal disorders treated?
  • Can retinal disorders be prevented?

Read the full article at MedlinePlus

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

Convert H34.00 to ICD-9-CMHistory

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

ICD-9-CM
362.34 Transient arterial occlu
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 H34.00Overview

What is the ICD-10 code for transient retinal artery occlusion, unspecified eye?

The ICD-10-CM code for transient retinal artery occlusion, unspecified eye is H34.00 (sometimes written as H3400). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H34.00 (Transient retinal artery occlusion) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report transient retinal artery occlusion, unspecified eye on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H34.00 group to?

When transient retinal artery occlusion, unspecified eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 123 (neurological Eye Disorders), which carries a relative weight of 0.8218. Higher weights mean higher Medicare reimbursement.

Is H34.00 a CC or MCC?

CMS lists H34.00 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 46 closely related codes in its exclusion list.

Can H34.00 be reported with G45.3?

Not as a rule. The Excludes1 note at H34, which applies to H34.00, lists "amaurosis fugax (G45.3)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).