Does G90.81 require prior authorization?

No, G90.81 does not require prior authorization (high confidence). Covered without prior authorization.

`G90.81`, Serotonin syndrome

ICD-10-CM

No Prior Auth Required

Covered without prior authorization (high confidence)

This article provides billing/coding guidelines that complement Local Coverage Determination L34417 for CT of the head; consult LCD L34417 for specific coverage, coding, and documentation requirements.
For claims using CPT codes not listed in this article, submit supporting clinical and billing documentation for individual review.
A claim for the prior routine EEG must have been submitted to Medicare with a date of service within 1 year of the ambulatory EEG date of service; documentation/proof of that prior claim must be available.
When billing only the professional or the technical component, documentation must indicate which component was provided and support billing of that single component.

Ambulatory continuous EEG is covered only if a prior routine “resting” EEG was performed before the ambulatory EEG.
Routine EEGs covered under this policy are those described by CPT codes 95812, 95813, 95816, 95819, or 95822.
A routine EEG is defined as a recording of less than a 24-hour continuous duration.
NC-stat testing (CPT 95905) is allowed when the beneficiary has a high pre-test or prior probability of Carpal Tunnel Syndrome (CTS), limited to one service per arm.
Use CPT 95870 for sampling muscles other than the paraspinals associated with the extremities that have been tested.
Distal small fiber neuropathy

NGS-J6-L35098, Nerve Conduction Studies and Electromyography

A57668, Billing and Coding: Nerve Conduction Studies and Electromyography

NGS-JK-L35098, Nerve Conduction Studies and Electromyography

CIGNA-0506, Autonomic Nerve Function Testing

A56612, Billing and Coding: CT of the Head

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