G93.40 — Encephalopathy, unspecified
ICD-10-CM
Prior Authorization
No Prior Auth Required
Code is covered without prior authorization (high confidence)
Documentation Required
- The patient's medical record must contain documentation that fully supports the medical necessity for the visual fields testing in accordance with the applicable LCD.
- Documentation should include relevant medical history, a physical examination, and results of pertinent diagnostic tests or procedures supporting the need for visual fields testing.
- The diagnosis code(s) reported on the claim must best describe the patient's condition for which the visual fields testing was performed.
- Refer to NCCI and OPPS requirements prior to billing Medicare to ensure coding compliance and to determine any bundling or packaging edits.
Key Coverage Criteria
- Visual field testing is covered when billed to the Part A or Part B MAC with a valid ICD-10-CM diagnosis code that best describes the patient’s condition and when the service is reasonable and necessary.
- For diagnostic visual field tests, report the test result on the claim if known; if the result is not known, report the signs or symptoms that prompted the test.
- If the service requires a referring/ordering physician, include the ordering/referring physician’s name and NPI on the claim.
- Ambulatory EEG is covered for diagnostic evaluation when seeking to detect clinical seizures or interictal epileptiform activity.
- Ambulatory EEG is covered for pre-surgical evaluation to localize seizure onset when capture of multiple seizures is needed for surgical planning.
- Ambulatory EEG is covered for routine follow-up monitoring of known seizure disorder or previously identified epileptiform activity.
16 Active Policies
A56767 — Billing and Coding: Heavy Metal Testing
J06
L35074 — Heavy Metal Testing
J06
A56551 — Billing and Coding: Visual Fields Testing
J06
A57030 — Billing and Coding: EEG Ambulatory Monitoring
J06
L33399 — EEG Ambulatory Monitoring
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