2027 ICD-10-CM Diagnosis Code H16.8Other keratitis

ICD-10-CM Codes›H00–H59›H15-H22›H16

ICD-10-CM H16.8
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H16.8 is a billable ICD-10-CM diagnosis code for other keratitis. 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
H16.8
Billable Status
Yes — Valid for Submission
Code Describes
Other keratitis
Short Description
Other keratitis
Same as the full description in the CMS dataset.
Parent Code
H16
Keratitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH16Keratitis
This CodeH16.8Other keratitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Autoimmune keratitis
  • Autosomal dominant keratitis
  • Bacterial keratitis
  • Bilateral diffuse lamellar keratitis of eyes
  • Bilateral marginal keratitis of eyes caused by staphylococcus toxin
  • Bilateral sclerokeratitis
  • Bullous keratopathy
  • Chemical injury to cornea
  • Chemical keratitis
  • Contact lens related sterile keratitis
  • Corneal inflammatory stromal infiltration
  • Diffuse lamellar keratitis
  • Diffuse lamellar keratitis of left eye
  • Diffuse lamellar keratitis of right eye
  • Disorder of eosinophil
  • Enlargement of corneal endothelial cells
  • Eosinophilic keratitis
  • Focal stromal keratitis
  • Fungal keratitis
  • Fusarium infection
  • Granulomatous amebic keratitis
  • Granulomatous keratitis
  • Inflammatory pseudoguttae
  • Keratitis bullosa
  • Keratitis due to trauma
  • Keratitis fugax hereditaria
  • Lyme keratitis
  • Marginal keratitis
  • Marginal keratitis of left eye caused by staphylococcus toxin
  • Marginal keratitis of right eye caused by staphylococcus toxin
  • Microsporidia keratitis
  • Mycobacterial keratitis
  • Mycotic keratitis caused by Fusarium
  • Mycotic keratitis caused by Fusarium oxysporum
  • Mycotic keratitis caused by Fusarium solani
  • Necrotizing keratitis
  • Ophthalmic Lyme borreliosis
  • Parasitic keratitis
  • Sclerokeratitis
  • Sclerokeratitis of left eye
  • Sclerokeratitis of right eye
  • Sterile keratitis
  • Vaccinia keratitis
  • Viral keratitis
  • Xerotic keratitis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H16.8: 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.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR EYE001
Cornea and external disease
Default principal diagnosis: inpatient No · outpatient Yes

Clinical InformationClinical

  • Keratitis

    inflammation of the cornea.

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 H16.8 to ICD-9-CMHistory

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

ICD-9-CM
370.8 Keratitis 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 H16.8Overview

What is the ICD-10 code for other keratitis?

The ICD-10-CM code for other keratitis is H16.8 (sometimes written as H168). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H16.8 (Keratitis) a billable code?

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

What MS-DRG does H16.8 group to?

When other keratitis 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 H16.8?

Under the General Equivalence Mappings, other keratitis converts to ICD-9-CM 370.8 (keratitis NEC). The mapping is approximate, so confirm the match fits the documentation.