ICD-10-CM Code H16.9

Unspecified keratitis

Version 2020 Billable Code

Valid for Submission

H16.9 is a billable code used to specify a medical diagnosis of unspecified keratitis. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code H16.9 might also be used to specify conditions or terms like autosomal recessive keratitis-ichthyosis-deafness syndrome, corneal abrasion, cutaneous syndrome with ichthyosis, factitious keratitis, fungal keratitis, fungal keratitis, etc

Short Description:Unspecified keratitis
Long Description:Unspecified keratitis

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code H16.9 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Autosomal recessive keratitis-ichthyosis-deafness syndrome
  • Corneal abrasion
  • Cutaneous syndrome with ichthyosis
  • Factitious keratitis
  • Fungal keratitis
  • Fungal keratitis
  • Infected corneal abrasion
  • Infectious epithelial keratitis
  • Keratitis
  • Keratitis caused by infection
  • Keratitis ichthyosis and deafness syndrome
  • Keratitis of left eye caused by fungus
  • Keratitis of right eye caused by fungus
  • Old keratitis
  • Senter syndrome
  • Superficial injury of cornea

Clinical Information

  • CORNEAL ULCER-. loss of epithelial tissue from the surface of the cornea due to progressive erosion and necrosis of the tissue; usually caused by bacterial fungal or viral infection.
  • KERATITIS-. inflammation of the cornea.
  • KERATITIS DENDRITIC-. a form of herpetic keratitis characterized by the formation of small vesicles which break down and coalesce to form recurring dendritic ulcers characteristically irregular linear branching and ending in knoblike extremities. dictionary of visual science 3d ed
  • ACANTHAMOEBA KERATITIS-. infection of the cornea by an ameboid protozoan which may cause corneal ulceration leading to blindness.
  • KERATITIS HERPETIC-. a superficial epithelial herpesvirus hominis infection of the cornea characterized by the presence of small vesicles which may break down and coalesce to form dendritic ulcers keratitis dendritic. dictionary of visual science 3d ed

Diagnostic Related Groups

The ICD-10 code H16.9 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.


Convert H16.9 to ICD-9

Code Classification

  • Diseases of the eye and adnexa (H00–H59)
    • Disorders of sclera, cornea, iris and ciliary body (H15-H22)
      • Keratitis (H16)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

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.

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

[Learn More]