2022 ICD-10-CM Diagnosis Code H18.9

Unspecified disorder of cornea

    2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
  • H18.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2022 edition of ICD-10-CM H18.9 became effective on October 1, 2021.
  • This is the American ICD-10-CM version of H18.9 - other international versions of ICD-10 H18.9 may differ.
The following code(s) above H18.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to H18.9:
  • H00-H59
    2022 ICD-10-CM Range H00-H59

    Diseases of the eye and adnexa

    • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition
    Type 2 Excludes
    • 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)
    Diseases of the eye and adnexa
Approximate Synonyms
  • Bilateral corneal disorder
  • Bilateral keratopathy
  • Bilateral punctate epithelial keratopathy
  • Bilateral punctate epithelial keratopathy(pek)
  • Bilateral vortex keratopathy
  • Bilateral vortex keratopathy (eye condition)
  • Corneal disorder
  • Disorder of cornea
  • Disorder of cornea of bilateral eyes
  • Disorder of cornea of left eye
  • Disorder of cornea of right eye
  • Keratopathy caused by medication
  • Keratopathy due to corneal stem cell failure
  • Keratopathy medicamentosa
  • Left corneal disorder
  • Left keratopathy
  • Left punctate epithelial keratopathy
  • Left punctate epithelial keratopathy(pek)
  • Left vortex keratopathy
  • Left vortex keratopathy (eye condition)
  • Marginal keratitis
  • Right corneal disorder
  • Right keratopathy
  • Right punctate epithelial keratopathy
  • Right punctate epithelial keratopathy(pek)
  • Right vortex keratopathy
  • Right vortex keratopathy (eye condition)
  • Staphylococcal hypersensitivity keratopathy
Clinical Information
  • Diseases of the cornea.
  • Pathological process affecting the transparent anterior portion of the fibrous coat of the eye.
  • The transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous epithelium, bowman's membrane, stroma, descemet's membrane, and mesenchymal endothelium. It serves as the first refracting medium of the eye. It is structurally continuous with the sclera, is avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the trigeminal nerve via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses.
  • The transparent part of the eye that covers the iris and the pupil and allows light to enter the inside.
  • 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. Problems with the cornea include
    • refractive errors
    • allergies
    • infections
    • injuries
    • dystrophies - conditions in which parts of the cornea lose clarity due to a buildup of cloudy material
    treatments of corneal disorders include medicines, corneal transplantation and corneal laser surgery. nih national eye institute
ICD-10-CM H18.9 is grouped within Diagnostic Related Group(s) (MS-DRG v39.0):
  • 124 Other disorders of the eye with mcc
  • 125 Other disorders of the eye without mcc

Convert H18.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change

Diagnosis Index entries containing back-references to H18.9:

ICD-10-CM Codes Adjacent To H18.9
H18.83 Recurrent erosion of cornea
H18.831 …… right eye
H18.832 …… left eye
H18.833 …… bilateral
H18.839 …… unspecified eye
H18.89 Other specified disorders of cornea
H18.891 …… right eye
H18.892 …… left eye
H18.893 …… bilateral
H18.899 …… unspecified eye
H18.9 Unspecified disorder of cornea
H20 Iridocyclitis
H20.0 Acute and subacute iridocyclitis
H20.00 Unspecified acute and subacute iridocyclitis
H20.01 Primary iridocyclitis
H20.011 …… right eye
H20.012 …… left eye
H20.013 …… bilateral
H20.019 …… unspecified eye
H20.02 Recurrent acute iridocyclitis
H20.021 …… right eye

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.