Does I97.821 require prior authorization?

No, I97.821 does not require prior authorization (high confidence). Code is covered without prior authorization.

`I97.821` — Postprocedural cerebrovascular infarction following other surgery

ICD-10-CM

No Prior Auth Required

Code is covered without prior authorization (high confidence)

Claims must meet the reasonable and necessary documentation requirements specified in LCD L35035; include clinical records demonstrating medical necessity per the LCD.
Follow the NCCI Coding Policy Manual (Chapters V and IX) for proper coding; retain documentation supporting compliance with NCCI edits.
When billing services that the LCD does not cover, use the appropriate Medicare modifier and document the basis for billing a non-covered service.
The ordering/referring practitioner's assessment related to the patient's complaint and the specific reason for the test must be documented in the medical record.

Coverage for thoracic aortography and carotid, vertebral, and subclavian angiography is determined by Local Coverage Determination L35035; services are covered when reasonable and necessary per that LCD.
Non-invasive vascular diagnostic tests are covered when ordered by the treating practitioner or a consulting physician who will use the results to manage the beneficiary's specific medical problem.
A documented referral/order must be on record for each individual non-invasive vascular study performed for coverage to apply.
Cerebrovascular arterial duplex follow-up is covered annually for stenosis 20–49% (diameter reduction).
Cerebrovascular arterial duplex follow-up is covered every six months for stenosis 50–79% (diameter reduction).
Cerebrovascular arterial duplex follow-up is covered every six months for stenosis 80–99% if surgical correction has not been performed.

A57592 — Billing and Coding: Non-Invasive Cerebrovascular Studies

J05

L35753 — Non-Invasive Cerebrovascular Studies

J05

A56758 — Billing and Coding: Non-Invasive Vascular Studies

J06

L33627 — Non-Invasive Vascular Studies

J06

L36767 — Aortography and peripheral angiography

Ask Verity about documentation requirements, denial risks, or coverage in your state.