Does T48.905A require prior authorization?

No, T48.905A does not require prior authorization (high confidence). Covered without prior authorization.

`T48.905A`, Adverse effect of unspecified agents primarily acting on the respiratory system, initial encounter

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.
The patient's medical record must contain documentation that fully supports medical necessity, including relevant medical history, physical examination, and results of pertinent diagnostic tests or procedures.
Each claim must be submitted with ICD-10-CM code(s) that reflect the patient's condition and indicate the reason(s) the service was performed; claims without ICD-10-CM codes will be returned.

RAST type tests are covered when medically necessary and supported by the related Local Coverage Determination (LCD) and current medical literature or standards of practice.
Monitored Anesthesia Care (MAC) is medically necessary when the patient has one or more documented diagnoses listed as supporting medical necessity (e.g., F91.9, G97.81, T81.9XXA, T88.8XXA, F79) and the diagnosis is matched to the anesthesia/CPT/HCPCS procedure performed.
Use G9 anesthesia modifier to indicate need for MAC due to a history of severe or advanced cardiopulmonary disease when the proceduralist determines additional monitoring is required.
Use G8 anesthesia modifier for certain deep, complex, complicated, or markedly invasive surgical procedures when applied to anesthesia codes 00100, 00300, 00400, 00160, 00532, or 00920.
MAC may be appropriate for pediatric patients (Medicare-eligible and younger than 18) when documented using ICD-10-CM code T88.8XXA and clinical records justify the need for MAC.
Allergy testing is covered when the patient has clinically significant allergic symptoms and conservative therapy has failed.

WPS-J5-L36402, Allergy Testing

A57473, Billing and Coding: Allergy Testing

A56844, Billing and Coding: RAST Type Tests

NGS-J6-L33591, RAST Type Tests

WPS-J8-L36402, Allergy Testing

NOVITAS-JH-L35049, Monitored Anesthesia Care

NGS-JK-L33591, RAST Type Tests

NOVITAS-JL-L35049, Monitored Anesthesia Care

A57361, Billing and Coding: Monitored Anesthesia Care

A56612, Billing and Coding: CT of the Head

A59186, Billing and Coding: Magnesium