T59.91XA — Toxic effect of unspecified gases, fumes and vapors, accidental (unintentional), initial encounter
ICD-10-CM
Prior Authorization
No Prior Auth Required
Code is covered without prior authorization (high confidence)
Documentation Required
- 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.
- Claims must follow the complementary Local Coverage Determination (LCD L34430) and, when CPT 97000–97799 are used by PT/OT, must include documentation that the services meet the coverage and documentation requirements for physical or occupational therapy.
- Follow LCD L35434 for reasonable and necessary requirements and supporting medical documentation for oximetry services.
- Report overnight oximetry using CPT code 94762 on claims.
Key Coverage Criteria
- Therapeutic procedures whose principal aim is to treat a respiratory impairment must be billed using HCPCS codes G0237, G0238, or G0239.
- Cranial CT (with or without contrast) is covered when the patient has clinical evidence of an intracranial disorder or an established intracranial disorder/disease.
- Contrast-enhanced CT is reasonable and necessary to assess cerebral perfusion, for example in suspected or known cerebrovascular accident (CVA).
- Contrast-enhanced CT is covered to characterize a specific intracranial lesion.
- Contrast-enhanced CT is covered to detect blood–brain barrier defects such as infarcts, tumors, infection, or vasculitis.
- Contrast-enhanced CT is covered to detect neovascularity associated with intracranial tumors.
6 Active Policies
A57205 — Billing and Coding: Oximetry Services
J12
L35434 — Oximetry Services
J12
A56612 — Billing and Coding: CT of the Head
A56717 — Billing and Coding: Respiratory Therapy (Respiratory Care)
L34417 — CT of the Head
Related Codes
Have a follow-up question?
Ask Verity about documentation requirements, denial risks, or coverage in your state.