2027 ICD-10-CM Diagnosis Code H18.899Other specified disorders of cornea, unspecified eye

ICD-10-CM Codes›H00–H59›H15-H22›H18

ICD-10-CM H18.899
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H18.899 is a billable ICD-10-CM diagnosis code for other specified disorders of cornea, unspecified 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H18.899
Billable Status
Yes — Valid for Submission
Code Describes
Other specified disorders of cornea, unspecified eye
Short Description
Other specified disorders of cornea, unspecified eye
Same as the full description in the CMS dataset.
Parent Code
H18.89
Other specified disorders of cornea

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH18Other disorders of cornea
This CodeH18.899Other specified disorders of cornea, unspecified eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Benign neoplasm of cornea
  • Blister to cornea
  • Central corneal epithelial staining pattern
  • Chrysiasis of cornea
  • Clear corneal incision
  • Clouding of corneal stroma
  • Coats' white ring
  • Complication of laser surgery
  • Complication of refractive keratoplasty by laser surgery
  • Cornea stromal loss
  • Corneal central stromal loss
  • Corneal decompensation
  • Corneal dendrite
  • Corneal endothelial plaque
  • Corneal epithelial defect
  • Corneal epithelial defect following penetrating keratoplasty
  • Corneal epithelial dots
  • Corneal epithelial fingerprint lines
  • Corneal epithelial ingrowth
  • Corneal epithelial lines
  • Corneal epithelial map lines
  • Corneal epithelial staining finding
  • Corneal epithelial vesicles
  • Corneal epithelium loose
  • Corneal exposure
  • Corneal fibrosis
  • Corneal filament
  • Corneal hemorrhage
  • Corneal hypoxia
  • Corneal immune ring
  • Corneal incision intact
  • Corneal infection
  • Corneal iron deposits
  • Corneal melting disorder
  • Corneal nerve finding
  • Corneal nerves inflamed
  • Corneal nerves thickened
  • Corneal peripheral stromal loss
  • Corneal stromal wrinkles
  • Corneal suture in place
  • Corneal thinning
  • Corneal warpage
  • Debris in corneal flap interface
  • Decentered corneal stromal ablation
  • Dermoid cyst of cornea
  • Dermoid cyst of eye proper
  • Disruption of corneal endothelial pattern
  • Drug-induced disorder of cornea
  • Dry cornea
  • EDICT syndrome
  • Enlargement of corneal endothelial cells
  • Entire corneal epithelial staining pattern
  • Epithelial inclusion cyst of cornea
  • Epithelial ingrowth
  • Ferry's line
  • Finding of tear meniscus
  • Fluorescein staining of cornea
  • High tear meniscus
  • Hypertrophy of corneal epithelium
  • Irregular astigmatism
  • Irregular astigmatism - corneal
  • Irregular corneal epithelial staining pattern
  • Keratic precipitates
  • Keratinization of ocular surface
  • Limbal corneal ring
  • Limbal guttering
  • Limbal guttering - simple
  • Limbal stem cell deficiency
  • Lump at corneal limbus
  • Marginal corneal infiltrate
  • Metallic pigmentation of cornea
  • Perforating corneoscleral wound
  • Perforation of cornea
  • Peripheral corneal epithelial staining pattern
  • Persistent corneal epithelial defect
  • Posterior polymorphic plaques in cornea
  • Pseudo-gerontoxon
  • Retrocorneal fibrous membrane
  • Rheumatoid melting disorder of cornea
  • Ring dermoid of cornea
  • Stromal corneal hemorrhage
  • Tear film finding
  • Vogt's limbal girdle
  • Vogt's limbal girdle, type I
  • Vogt's limbal girdle, type II
  • Vogt's striae
  • Vortex keratopathy
  • Xerosis of cornea

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H18.899: its own notes plus those printed at Chapter 7. A note printed at a category, block or chapter applies to every code under it.

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 EYE001
Cornea and external disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Corneal Disorders

Your cornea is the outermost layer of your eye. It is clear and shaped like a dome. The cornea helps to shield the rest of the eye from germs, dust, and other harmful matter. It also helps your eye to focus. If you wear contact lenses, they float on top of your corneas.

Read the full article at MedlinePlus

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

Convert H18.899 to ICD-9-CMHistory

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

ICD-9-CM
371.89 Corneal disorder NEC
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 H18.899Overview

What is the ICD-10 code for other specified disorders of cornea, unspecified eye?

The ICD-10-CM code for other specified disorders of cornea, unspecified eye is H18.899 (sometimes written as H18899). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H18.899 (Other specified disorders of cornea) a billable code?

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

What MS-DRG does H18.899 group to?

When other specified disorders of cornea, unspecified 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 H18.899?

Under the General Equivalence Mappings, other specified disorders of cornea, unspecified eye converts to ICD-9-CM 371.89 (corneal disorder NEC). The mapping is approximate, so confirm the match fits the documentation.