2027 ICD-10-CM Diagnosis Code H05.259Intermittent exophthalmos, unspecified eye

ICD-10-CM Codes›H00–H59›H00-H05›H05

ICD-10-CM H05.259
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H05.259 is a billable ICD-10-CM diagnosis code for intermittent exophthalmos, 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. Coders also document this condition as intermittent exophthalmos. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Oculofacial plastics and orbital conditions.

Code Identity

ICD-10-CM Code
H05.259
Billable Status
Yes — Valid for Submission
Code Describes
Intermittent exophthalmos, unspecified eye
Short Description
Intermittent exophthalmos, unspecified eye
Same as the full description in the CMS dataset.
Parent Code
H05.25
Intermittent exophthalmos

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH05Disorders of orbit
This CodeH05.259Intermittent exophthalmos, unspecified eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Intermittent exophthalmos

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H05.259: its own notes plus those printed at H05, block H00-H05, 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 H05 Disorders of orbit applies to 102 codes
  • congenital malformation of orbit (Q10.7)

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 Block H00-H05 Disorders of eyelid, lacrimal system and orbit applies to 574 codes
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 EYE008
Oculofacial plastics and orbital conditions
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?
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  • 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 H05.259 to ICD-9-CMHistory

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

ICD-9-CM
376.34 Intermittnt exophthalmos
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 H05.259Overview

What is the ICD-10 code for intermittent exophthalmos, unspecified eye?

The ICD-10-CM code for intermittent exophthalmos, unspecified eye is H05.259 (sometimes written as H05259). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H05.259 (Intermittent exophthalmos) a billable code?

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

What MS-DRG does H05.259 group to?

When intermittent exophthalmos, 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.

Can H05.259 be reported with Q10.7?

Not as a rule. The Excludes1 note at H05, which applies to H05.259, lists "congenital malformation of orbit (Q10.7)". 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).

What is the ICD-9 equivalent of H05.259?

Under the General Equivalence Mappings, intermittent exophthalmos, unspecified eye converts to ICD-9-CM 376.34 (intermittnt exophthalmos). The mapping is approximate, so confirm the match fits the documentation.