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ICD-10 Guide
ICD-10 CodesH16.399

H16.399

Billable

Other interstitial and deep keratitis, unspecified eye

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/06/2025

Code Description

ICD-10 H16.399 is a billable code used to indicate a diagnosis of other interstitial and deep keratitis, unspecified eye.

Key Diagnostic Point:

Other interstitial and deep keratitis, unspecified eye

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity
The clinical complexity of H16.399 can vary based on the underlying cause of the keratitis, which may include infections, autoimmune disorders, or exposure to irritants. Diagnosis may require comprehensive eye examination and additional diagnostic testing.

Specialty Focus

Medical Specialties

Ophthalmology

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Optometry

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Coding Guidelines

Inclusion Criteria

Use H16.399 When
  • Accurate documentation of the patient's symptoms, history, and examination findings is essential
  • Ensure that the specific type of keratitis is documented if known, and include any relevant comorbidities that may affect treatment

Exclusion Criteria

Do NOT use H16.399 When
No specific exclusions found.

Related ICD-10 Codes

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CPT Code

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Clinical Scenario

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CPT Code

Clinical Scenario

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CPT Code

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Documentation Requirements

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

Correct coding of H16.399 is critical for appropriate reimbursement. Misclassification can lead to claim denials or delays. Proper documentation supports medical necessity for treatments and procedures.

ICD-9 vs ICD-10

Correct coding of H16.399 is critical for appropriate reimbursement. Misclassification can lead to claim denials or delays. Proper documentation supports medical necessity for treatments and procedures.

Reimbursement & Billing Impact

reimbursement. Misclassification can lead to claim denials or delays. Proper documentation supports medical necessity for treatments and procedures.

Resources

Clinical References

  • •
    American Academy of Ophthalmology - Keratitis
  • •
    National Eye Institute - Corneal Diseases
  • •
    American Optometric Association - Eye Care and Keratitis

Coding & Billing References

  • •
    American Academy of Ophthalmology - Keratitis
  • •
    National Eye Institute - Corneal Diseases
  • •
    American Optometric Association - Eye Care and Keratitis

Frequently Asked Questions

What are the common symptoms of interstitial and deep keratitis?

Common symptoms include eye pain, redness, blurred vision, sensitivity to light, and discharge. Patients may also experience tearing and a feeling of something in the eye.

How is interstitial and deep keratitis diagnosed?

Diagnosis typically involves a comprehensive eye examination, including visual acuity tests, slit-lamp examination, and possibly corneal imaging or cultures to identify the underlying cause.

What treatments are available for interstitial and deep keratitis?

Treatment options may include topical or systemic antibiotics, corticosteroids, antiviral medications, or lubricating eye drops, depending on the cause of the keratitis.