Does I97.821 require prior authorization?

No, I97.821 does not require prior authorization (high confidence). Covered without prior authorization.

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

ICD-10-CM

No Prior Auth Required

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.

CGS-J15-L34045, Non-Invasive Vascular Studies

J15

CGS-J18-L34045, Non-Invasive Vascular Studies

J18

A57592, Billing and Coding: Non-Invasive Cerebrovascular Studies

WPS-J5-L35753, Non-Invasive Cerebrovascular Studies

A56758

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